This application is based upon and claims the benefit of priority from prior Japanese Patent Applications No. 2009-158618, filed Jul. 3, 2009; No. 2009-158622, filed Jul. 3, 2009; and No. 2009-158629, filed Jul. 3, 2009, the entire contents of all of which are incorporated herein by reference.
1. Field of the Invention
This invention relates to a semiconductor construct.
2. Description of the Related Art
Conventional semiconductor devices include a semiconductor device having a semiconductor construct called a chip size package (CSP) that is fixedly attached to a base plate greater in size than the semiconductor construct (e.g., see Jpn. Pat. Appln. KOKAI Publication No. 2006-12885). In this case, the semiconductor construct called the CSP has a structure that includes a semiconductor substrate, wirings provided on the semiconductor substrate, columnar electrodes respectively provided on connection pads of the wirings, and a sealing film provided around the columnar electrodes.
Furthermore, the lower surface of the semiconductor substrate of the semiconductor construct is fixedly attached to the base plate. An insulating layer is provided on the base plate around the semiconductor construct. An upper insulating film is provided over the semiconductor construct and the insulating layer. Upper wirings are provided on the upper insulating film so as to be connected to the columnar electrodes of the semiconductor construct. The upper wirings, except for its connection pads, are covered with an overcoat film. Solder balls are provided on the connection pads of the upper wirings (e.g., see Jpn. Pat. Appln. KOKAI Publication No. 2006-12885).
In the meantime, the columnar electrodes are respectively provided on the connection pads of the wirings in the semiconductor construct of the above-mentioned conventional semiconductor device. Thus, the relation between the wirings and the columnar electrodes is one-to-one. This is a disadvantage when the line width of the wirings is reduced to about 20 μm or less due to an increase in the number of the wirings and columnar electrodes. In this case, when an excessively high current originating from, for example, a power supply voltage, runs through the wirings, the wirings are burned off and broken.
According to an aspect of embodiments, a semiconductor construct includes a semiconductor substrate, connection pads provided on the semiconductor substrate, a common wiring provided in a region including a predetermined number of connection pads among the connection pads so as to be connected to the predetermined number of connection pads, a wiring provided to be connected to the remaining of the connection pads, a first columnar electrode provided to be connected to the common wiring, and a second columnar electrode provided to be connected to a connection pad portion of the wiring.
According to another aspect of embodiments, a method of manufacturing a semiconductor construct includes forming a common wiring and a wiring on a semiconductor substrate provided with connection pads, the common wiring being formed in a region including common voltage connection pads among the connection pads so as to be connected to the common voltage connection pads, the wiring being formed so as to be connected to the remaining of the connection pads, and forming a first columnar electrode on the common wiring, and forming a second columnar electrode on a connection pad portion of the wiring.
Advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out hereinafter.
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the invention.
The present invention will be fully understood by the following detailed description and the accompanying drawings, which only serve to explain the invention and do not limit the scope of the invention. In the drawings:
The semiconductor construct 2, which is generally called a CSP, includes a silicon substrate (semiconductor substrate) 4. The lower surface of the silicon substrate 4 is bonded to the center of the upper surface of the base plate 1 through the bonding layer 3. Elements (not shown) such as a transistor, diode, resistor, and condenser that constitute an integrated circuit having a predetermined function are formed on the upper surface of the silicon substrate 4. Connection pads 5a, 5b, 5c are provided on the peripheral portion of the upper surface of the silicon substrate 4. The connection pads 5a, 5b, 5c are made of, for example, an aluminum-based metal, and connected to the elements of the integrated circuit.
Here, by way of example, the four connection pads indicated by the sign 5a and arranged on the upper left part of the silicon substrate 4 in
A passivation film (insulating film) 6 made of, for example, silicon oxide is provided on the upper surface of the silicon substrate 4 except for the peripheral portion of the silicon substrate 4 and the centers of the connection pads 5a, 5b, 5c. The centers of the connection pads 5a, 5b, 5c are exposed through openings 7a, 7b, 7c provided in the passivation film 6. A protective film (insulating film) 8 made of, for example, a polyimide resin is provided on the upper surface of the passivation film 6. Openings 9a, 9b, 9c are provided in parts of the protective film 8 that correspond to the openings 7a, 7b, 7c of the passivation film 6.
Wirings 10a, 10b, 10c are provided on the upper surface of the protective film 8. The wirings 10a, 10b, 10c have a double-layer structure composed of foundation metal layers 11a, 11b, 11c and upper metal layers 12a, 12b, 12c. The foundation metal layers 11a, 11b, 11c are made of, for example, copper and provided on the upper surface of the protective film 8. The upper metal layers 12a, 12b, 12c are made of copper and provided on the upper surfaces of the foundation metal layers 11.
In this case, as shown in
The wiring indicated by the sign 10b (common wiring) is solidly disposed on the lower left part of the silicon substrate 4 in a region that has a square planar shape and includes the four ground voltage connection pads 5b. The wiring 10b is connected to all of the four ground voltage connection pads 5b via the openings 7b, 9b of the passivation film 6 and the protective film 8.
The wirings indicated by the sign 10c are disposed in the right region of the silicon substrate 4. Each wiring 10c has a connection portion 10c-1 connected to the normal voltage connection pad 5c via the openings 7c, 9c of the passivation film 6 and the protective film 8, a connection pad portion 10c-2 having a circular planar shape, and an extension line 10c-3 extending between the connection portion 10c-1 and the connection pad portion 10c-2.
Similarly to the wiring 10a, a columnar electrode (common columnar electrode, first columnar electrode) 13a is solidly provided in the region of the upper surface, except for its peripheral portion, of the wiring indicated by the sign 10a and having a square planar shape. The columnar electrode 13a is made of copper and has a square planar shape. Similarly to the wiring 10b, a columnar electrode (common columnar electrode, first columnar electrode) 13b is solidly provided in the region of the upper surface, except for the peripheral portion, of the wiring indicated by the sign 10b and having a square planar shape. The columnar electrode 13b is made of copper and has a square planar shape. Columnar electrodes (second columnar electrodes) 13c are provided on the upper surface of the connection pad portions 10c-2 of the wirings indicated by the sign 10c. The columnar electrodes 13c are made of copper and have a circular planar shape. Here, as shown in
A sealing film 14 made of, for example, an epoxy resin is provided around the columnar electrodes 13a, 13b, 13c on the upper surface of the protective film 8 including the wirings 10a, 10b, 10c. The columnar electrodes 13a, 13b, 13c are provided so that the upper surfaces thereof are flush with or several μm lower than the upper surface of the sealing film 14. The explanation of the structure of the semiconductor construct 2 is completed now.
An insulating layer 21 in a square frame shape is provided on the upper surface of the base plate 1 around the semiconductor construct 2. For example, the insulating layer 21 is made of a thermosetting resin such as an epoxy resin in which a reinforcer of an inorganic material such as silica fuller is dispersed. Alternatively, the insulating layer 21 is only made of a thermosetting resin such as an epoxy resin.
An upper insulating film 22 is provided on the upper surfaces of the semiconductor construct 2 and the insulating layer 21. The upper insulating film 22 is made of, for example, a base glass fabric impregnated with a thermosetting resin such as an epoxy resin. Alternatively, the upper insulating film 22 is only made of a thermosetting resin such as an epoxy resin. Openings (first openings) 23a, 23b having a circular planar shape are provided in parts of the upper insulating film 22 that correspond to predetermined nine points on the surface of the columnar electrodes 13a, 13b of the semiconductor construct 2 having a square planar shape. Openings (second openings) 23c having a circular planar shape are provided in parts of the upper insulating film 22 that correspond to the centers of the upper surfaces of the columnar electrodes 13c of the semiconductor construct 2 having a circular planar shape.
In this case, the planar shape of the openings 23a, 23b is the same as the planar shape of the opening 23c. Moreover, both the number of the openings 23a and the number of the openings 23b are nine, and are greater than the number (four) of the power supply voltage and ground voltage connection pads 5a, 5b of the semiconductor construct 2.
Upper wirings 24a, 24b, 24c are provided on the upper surface of the upper insulating film 22. The upper wirings 24a, 24b, 24c have a double-layer structure composed of foundation metal layers 25a, 25b, 25c and upper metal layers 26a, 26b, 26c. The foundation metal layers 25a, 25b, 25c are made of, for example, copper and provided on the upper surface of the upper insulating film 22. The upper metal layers 26a, 26b, 26c are made of copper and provided on the upper surfaces of the foundation metal layers 25a, 25b, 25c.
In this case, as shown in
The upper wiring indicated by the sign 24b (common upper wiring, first upper wiring) is solidly disposed on the lower left part of the upper insulating film 22 in a region of the upper insulating film 22 including nine openings 23b. The upper wiring 24b is connected, via all of the nine openings 23b of the upper insulating film 22, to the predetermined nine points on the surface of the ground voltage columnar electrode 13b of the semiconductor construct 2 having a square planar shape.
Similarly to the wiring of the semiconductor construct 2 indicated by the sign 10c, each upper wiring indicated by the sign 24c (second upper wiring) has a connection portion, a connection pad portion, and an extension line extending therebetween. The upper wiring 24c is connected, via the opening 23c of the upper insulating film 22, to the center of the upper surface of the columnar electrode 13c of the semiconductor construct 2 having a circular planar shape.
An overcoat film 27 made of, for example, a solder resist is provided on the upper surface of the upper insulating film 22 including the upper wirings 24a, 24b, 24c. Openings 28a, 28b are provided in parts of the overcoat film 27 that correspond to predetermined four points in the peripheral portions of the upper wirings 24a, 24b. An opening 28c is provided in a part of the overcoat film 27 that corresponds to the connection pad portion of the upper wiring 24c.
Solder balls 29a, 29b, 29c are provided in and above the openings 28a, 28b, 28c of the overcoat film 27 so that these solder balls are connected to the upper wirings 24a, 24b, 24c. In this case, as shown in
As described above, in this semiconductor device, the power supply voltage wiring 10a and the ground voltage wiring 10b of the semiconductor construct 2 are solidly formed in a square planar shape, and each connected to all of the four connection pads 5a, 5b. This allows the power supply voltage wiring 10a and the ground voltage wiring 10b not to be burned off even if an excessively high current runs through these wirings.
Furthermore, since the power supply voltage columnar electrode 13a and the ground voltage columnar electrode 13b of the semiconductor construct 2 are solidly formed, the columnar electrodes 13a, 13b can be reduced in resistance, and current capacity can thus be improved. Moreover, since the power supply voltage upper wiring 24a and the ground voltage upper wiring 24b are solidly formed, the upper wirings 24a, 24b can be reduced in resistance, and current capacity can thus be improved.
Still further, since the number (nine) of the openings 23a, 23b provided in the upper insulating film 22 on the power supply voltage and ground voltage columnar electrodes 13a, 13b of the semiconductor construct 2 is greater than the number (four) of the power supply voltage and ground voltage connection pads 5a, 5b, the connection portions of the openings 23a, 23b can be reduced in resistance as a whole, and current capacity can thus be further improved.
Here, the sizes of the parts of this semiconductor device are mentioned. The size of the base plate 1 is 3×3 mm. The size of the semiconductor construct 2 is 2×2 mm. The line width of the extension line 10c-3 of the wiring 10c of the semiconductor construct 2 is 20 μm. The diameter of the columnar electrode 13c of the semiconductor construct 2 having a circular planar shape is 0.2 mm. The pitch of the columnar electrodes 13c is 0.4 mm. The diameter of the opening 23a, 23b, 23c of the upper insulating film 22 is 100 μm. The diameter of the solder balls 29a, 29b, 29c is 0.3 mm. The pitch of the solder balls 29a, 29b, 29c is 0.65 mm.
Now, one example of a method of manufacturing this semiconductor device is described. First, one example of a method of manufacturing the semiconductor construct 2 is described. In this case, the ground voltage connection pad 5b and associated parts are substantially similar to the power supply voltage connection pads 5a and associated parts, and are therefore not described.
First, as shown in
In this case, the thickness of the semiconductor wafer 31 is greater than the thickness of a silicon substrate 4 shown in
Then, as shown in
Then, a plating resist film 34 made of a positive liquid resist is patterned and formed on the upper surface of the foundation metal layer 33. In this case, openings 35a, 35c are formed in parts of the plating resist film 34 corresponding to regions where upper metal layers 12a, 12c are to be formed. Further, electrolytic plating with copper is carried out using the foundation metal layer 33 as a plating current path, thereby forming the upper metal layers 12a, 12c on the upper surface of the foundation metal layer 33 within the openings 35a, 35c in the plating resist film 34. Subsequently, the plating resist film 34 is released.
Then, as shown in
Then, electrolytic plating with copper is carried out using the foundation metal layer 33 as a plating current path. As a result, the columnar electrode 13a is formed on the upper surface of the upper metal layer 12a within the openings 37a in the plating resist film 36. Moreover, the columnar electrode 13c is formed on the upper surface of the connection pad portion of the upper metal layer 12c within the openings 37c in the plating resist film 36. Subsequently, the plating resist film 36 is released.
Then, using the upper metal layers 12a, 12c as masks, the foundation metal layer 33 located in parts other than parts under the upper metal layers 12a, 12c is etched and removed. Thus, as shown in
Then, as shown in
Then, the upper side of the sealing film 14 is properly ground to expose the upper surfaces of the columnar electrodes 13a, 13c as shown in
Then, as shown in
Now, one example of how to manufacture the semiconductor device shown in
First, as shown in
Then, the bonding layers 3 fixedly attached to the lower surfaces of the silicon substrates 4 of the semiconductor constructs 2 are bonded to semiconductor construct placement regions on the upper surface of the base plate 1 to leave space in between. In this bonding, the bonding layers 3 are fully cured by heating and pressurization.
Then, as shown in
Then, an upper insulating film formation sheet 22a is disposed on the upper surfaces of the semiconductor construct 2 and the insulating layer formation sheet 21a. The upper insulating film formation sheet 22a is prepared by impregnating, for example, glass fabric with a thermosetting resin such as an epoxy resin, and semi-curing the thermosetting resin into a sheet form.
Then, the insulating layer formation sheet 21a and the upper insulating film formation sheet 22a are heated and pressurized from the top and bottom using a pair of heating/pressurization plates 42, 43. By subsequent cooling, an insulating layer 21 in a square frame shape is formed on the upper surface of the base plate 1 around the semiconductor construct 2, and an upper insulating film 22 is formed on the upper surfaces of the semiconductor construct 2 and the insulating layer 21. In this case, the upper surface of the upper insulating film 22 is pressed by the lower surface of the upper heating/pressurization plate 42, and is therefore a flat surface.
Then, as shown in
Then, as shown in
Then, a plating resist film 45 is patterned and formed on the upper surface of the foundation metal layer 44. In this case, openings 46a, 46c are formed in parts of the plating resist film 45 corresponding to regions where upper metal layers 26a, 26c are to be formed. Further, electrolytic plating with copper is carried out using the foundation metal layer 44 as a plating current path, thereby forming the upper metal layers 26a, 26c on the upper surface of the foundation metal layer 44 within the openings 46a, 46c in the plating resist film 45.
Then, the plating resist film 45 is released. Further, using the upper metal layers 26a, 26c as masks, the foundation metal layer 44 located in parts other than parts under the upper metal layers 26a, 26c is etched and removed. Thus, as shown in
Then, as shown in
Then, solder balls 29a, 29c are formed in and above the openings 28a, 28c of the overcoat film 27 so that these solder balls are connected to the predetermined four points of the upper surface of the upper wiring 24a and to the connection pad portion of the upper wiring 24c. Further, as shown in
The semiconductor construct 2, which is generally called a CSP, includes a silicon substrate (semiconductor substrate) 4. The lower surface of the silicon substrate 4 is bonded to the center of the upper surface of the base plate 1 through the bonding layer 3. Elements (not shown) such as a transistor, diode, resistor, and condenser that constitute an integrated circuit having a predetermined function are formed on the upper surface of the silicon substrate 4. Connection pads 5a, 5b, 5c are provided on the peripheral portion of the upper surface of the silicon substrate 4. The connection pads 5a, 5b, 5c are made of, for example, an aluminum-based metal, and connected to the elements of the integrated circuit.
Here, by way of example, the four connection pads indicated by the sign 5a and arranged on the upper left part of the silicon substrate 4 in
A passivation film (insulating film) 6 made of, for example, silicon oxide is provided on the upper surface of the silicon substrate 4 except for the peripheral portion of the silicon substrate 4 and the centers of the connection pads 5a, 5b, 5c. The centers of the connection pads 5a, 5b, 5c are exposed through openings 7a, 7b, 7c provided in the passivation film 6. A protective film (insulating film) 8 made of, for example, a polyimide resin is provided on the upper surface of the passivation film 6. Openings 9a, 9b, 9c are provided in parts of the protective film 8 that correspond to the openings 7a, 7b, 7c of the passivation film 6.
Wirings 10a, 10b, 10c are provided on the upper surface of the protective film 8. The wirings 10a, 10b, 10c have a double-layer structure composed of foundation metal layers 11a, 11b, 11c and upper metal layers 12a, 12b, 12c. The foundation metal layers 11a, 11b, 11c are made of, for example, copper and provided on the upper surface of the protective film 8. The upper metal layers 12a, 12b, 12c are made of copper and provided on the upper surfaces of the foundation metal layers 11.
In this case, as shown in
The wiring indicated by the sign 10b (common wiring) is solidly disposed on the lower left part of the silicon substrate 4 in a region that has a square planar shape and includes the four ground voltage connection pads 5b. The wiring 10b is connected to all of the four ground voltage connection pads 5b via the openings 7b, 9b of the passivation film 6 and the protective film 8.
The wirings indicated by the sign 10c are disposed in the right region of the silicon substrate 4. Each wiring 10c has a connection portion 10c-1 connected to the normal voltage connection pad 5c via the openings 7c, 9c of the passivation film 6 and the protective film 8, a connection pad portion 10c-2 having a circular planar shape, and an extension line 10c-3 extending between the connection portion 10c-1 and the connection pad portion 10c-2.
Columnar electrodes (common columnar electrodes, first columnar electrodes) 13a are provided at predetermined four points on the upper surface of the wiring indicated by the sign 10a and having a square planar shape. The columnar electrodes 13a are made of copper and have a circular planar shape. Columnar electrodes (common columnar electrodes, first columnar electrodes) 13b are provided at predetermined four points on the upper surface of the wiring indicated by the sign 10b and having a square planar shape. The columnar electrodes 13b are made of copper and have a circular planar shape. Columnar electrodes (second columnar electrodes) 13c are provided on the upper surface of the connection pad portions 10c-2 of the wirings indicated by the sign 10c. The columnar electrodes 13c are made of copper and have a circular planar shape.
Here, the number of the columnar electrodes 13a and the number of the columnar electrodes 13b are the same as the number of the power supply voltage connection pads 5a and the number of the ground voltage connection pads 5b, respectively. Moreover, the columnar electrodes 13a, 13b have the same shape as the columnar electrodes 13c. In addition, as shown in
A sealing film 14 made of, for example, an epoxy resin is provided around the columnar electrodes 13a, 13b, 13c on the upper surface of the protective film 8 including the wirings 10a, 10b, 10c. The columnar electrodes 13a, 13b, 13c are provided so that the upper surfaces thereof are flush with or several μm lower than the upper surface of the sealing film 14. The explanation of the structure of the semiconductor construct 2 is completed now.
An insulating layer 21 in a square frame shape is provided on the upper surface of the base plate 1 around the semiconductor construct 2. For example, the insulating layer 21 is made of a thermosetting resin such as an epoxy resin in which a reinforcer of an inorganic material such as silica fuller is dispersed. Alternatively, the insulating layer 21 is only made of a thermosetting resin such as an epoxy resin.
An upper insulating film 22 is provided on the upper surfaces of the semiconductor construct 2 and the insulating layer 21. The upper insulating film 22 is made of, for example, a base glass fabric impregnated with a thermosetting resin such as an epoxy resin. Alternatively, the upper insulating film 22 is only made of a thermosetting resin such as an epoxy resin.
Openings (first openings) 23a, 23b having a square planar shape are provided in parts of the upper insulating film 22 that correspond to regions that have a square planar shape and include four columnar electrodes 13a, 13b of the semiconductor construct 2. An opening (second opening) 23c having a circular planar shape is provided in a part of the upper insulating film 22 that corresponds to the center of the upper surface of the columnar electrode 13c of the semiconductor construct 2.
Upper wirings 24a, 24b, 24c are provided on the upper surface of the upper insulating film 22. The upper wirings 24a, 24b, 24c have a double-layer structure composed of foundation metal layers 25a, 25b, 25c and upper metal layers 26a, 26b, 26c. The foundation metal layers 25a, 25b, 25c are made of, for example, copper and provided on the upper surface of the upper insulating film 22. The upper metal layers 26a, 26b, 26c are made of copper and provided on the upper surfaces of the foundation metal layers 25a, 25b, 25c.
In this case, as shown in
The upper wiring indicated by the sign 24b (common upper wiring, first upper wiring) is solidly disposed on the lower left part of the upper insulating film 22 in a region of the upper insulating film 22 including the opening 23b having a square planar shape. The upper wiring 24b is connected, via one opening 23b of the upper insulating film 22 having a square planar shape, to the upper surfaces of all the four ground voltage columnar electrodes 13b of the semiconductor construct 2. In this case as well, within the opening 23b of the upper insulating film 22, the upper wiring 24b is provided on the upper surfaces of the four columnar electrodes 13b of the semiconductor construct 2 and on the upper surface of the sealing film 14 therearound.
Similarly to the wiring of the semiconductor construct 2 indicated by the sign 10c, each upper wiring indicated by the sign 24c (second upper wiring) has a connection portion, a connection pad portion, and an extension line extending therebetween. The upper wiring 24c is connected to the center of the upper surface of the columnar electrode 13c of the semiconductor construct 2 via the opening 23c of the upper insulating film 22 having a circular planar shape. Here, as shown in
An overcoat film 27 made of, for example, a solder resist is provided on the upper surface of the upper insulating film 22 including the upper wirings 24a, 24b, 24c. Openings 28a, 28b are provided in parts of the overcoat film 27 that correspond to predetermined four points of the peripheral portion of the upper wirings 24a, 24b. An opening 28c is provided in a part of the overcoat film 27 that corresponds to the connection pad portion of the upper wiring 24c.
Solder balls 29a, 29b, 29c are provided in and above the openings 28a, 28b, 28c of the overcoat film 27 so that these solder balls are connected to the upper wirings 24a, 24b, 24c. In this case, as shown in
As described above, in this semiconductor device, the power supply voltage wiring 10a and the ground voltage wiring 10b of the semiconductor construct 2 are solidly formed in a square planar shape, and each connected to all of the four connection pads 5a, 5b. This allows the power supply voltage wiring 10a and the ground voltage wiring 10b not to be burned off even if an excessively high current runs through these wirings.
Furthermore, since one opening 23a, 23b having a square planar shape is provided in each of the parts of the upper insulating film 22 that correspond to the four power supply voltage columnar electrodes 13a and the four ground voltage columnar electrodes 13b of the semiconductor construct 2. The solidly-formed upper wirings 24a, 24b are provided on the upper insulating film 22 so that these upper wirings are connected to all the four columnar electrodes 13a and all the four columnar electrodes 13b of the semiconductor construct 2 via the opening 23a, 23b of the upper insulating film 22, the parts corresponding to the opening 23a, 23b of the upper insulating film 22 can be reduced in resistance, and current capacity can thus be improved.
Here, the sizes of the parts of this semiconductor device are mentioned. The size of the base plate 1 is 3×3 mm. The size of the semiconductor construct 2 is 2×2 mm. The line width of the extension line 10c-3 of the wiring 10c of the semiconductor construct 2 is 20 μm. The diameter of the columnar electrode 13a, 13b, 13c of the semiconductor construct 2 is 0.2 mm. The pitch of the columnar electrode 13a, 13b, 13c is 0.4 mm. The diameter of the opening 23c of the upper insulating film 22 having a circular planar shape is 100 μm. The diameter of the solder balls 29a, 29b, 29c is 0.3 mm. The pitch of the solder balls 29a, 29b, 29c is 0.65 mm.
Now, one example of a method of manufacturing this semiconductor device is described. First, one example of a method of manufacturing the semiconductor construct 2 is described. In this case, the ground voltage connection pad 5b and associated parts are substantially similar to the power supply voltage connection pads 5a and associated parts, and are therefore not described.
First, as shown in
In this case, the thickness of the semiconductor wafer 31 is greater than the thickness of a silicon substrate 4 shown in
Then, as shown in
Then, a plating resist film 34 made of a positive liquid resist is patterned and formed on the upper surface of the foundation metal layer 33. In this case, openings 35a, 35c are formed in parts of the plating resist film 34 corresponding to regions where upper metal layers 12a, 12c are to be formed. Further, electrolytic plating with copper is carried out using the foundation metal layer 33 as a plating current path, thereby forming the upper metal layers 12a, 12c on the upper surface of the foundation metal layer 33 within the openings 35a, 35c in the plating resist film 34. Subsequently, the plating resist film 34 is released.
Then, as shown in
Then, electrolytic plating with copper is carried out using the foundation metal layer 33 as a plating current path. As a result, the columnar electrode 13a is formed on the upper surface of the upper metal layer 12a within the openings 37a in the plating resist film 36. Moreover, the columnar electrode 13c is formed on the upper surface of the connection pad portion of the upper metal layer 12c within the openings 37c in the plating resist film 36. Subsequently, the plating resist film 36 is released.
Then, using the upper metal layers 12a, 12c as masks, the foundation metal layer 33 located in parts other than parts under the upper metal layers 12a, 12c is etched and removed. Thus, as shown in
Then, as shown in
Then, the upper side of the sealing film 14 is properly ground to expose the upper surfaces of the columnar electrodes 13a, 13c as shown in
Then, as shown in
Now, one example of how to manufacture the semiconductor device shown in
First, as shown in
Then, the bonding layers 3 fixedly attached to the lower surfaces of the silicon substrates 4 of the semiconductor constructs 2 are bonded to semiconductor construct placement regions on the upper surface of the base plate 1 to leave space in between. In this bonding, the bonding layers 3 are fully cured by heating and pressurization.
Then, as shown in
Then, an upper insulating film formation sheet 22a is disposed on the upper surfaces of the semiconductor construct 2 and the insulating layer formation sheet 21a. The upper insulating film formation sheet 22a is prepared by impregnating, for example, glass fabric with a thermosetting resin such as an epoxy resin, and semi-curing the thermosetting resin into a sheet form.
Then, the insulating layer formation sheet 21a and the upper insulating film formation sheet 22a are heated and pressurized from the top and bottom using a pair of heating/pressurization plates 42, 43. By subsequent cooling, an insulating layer 21 in a square frame shape is formed on the upper surface of the base plate 1 around the semiconductor construct 2, and an upper insulating film 22 is formed on the upper surfaces of the semiconductor construct 2 and the insulating layer 21. In this case, the upper surface of the upper insulating film 22 is pressed by the lower surface of the upper heating/pressurization plate 42, and is therefore a flat surface.
Then, as shown in
In this state, the upper surface of the sealing film 14 around the columnar electrodes 13a is exposed through the opening 23a having a square planar shape.
Then, as shown in
Then, a plating resist film 45 is patterned and formed on the upper surface of the foundation metal layer 44. In this case, openings 46a, 46c are formed in parts of the plating resist film 45 corresponding to regions where upper metal layers 26a, 26c are to be formed. Further, electrolytic plating with copper is carried out using the foundation metal layer 44 as a plating current path, thereby forming the upper metal layers 26a, 26c on the upper surface of the foundation metal layer 44 within the openings 46a, 46c in the plating resist film 45.
In this case, since the copper plating is isotropically formed on the upper surface of the foundation metal layer 44, the thinnest portion of the upper metal layer 26a formed on the upper surface of the foundation metal layer 44 within the opening 23a of the upper insulating film 22 is set at a thickness equal to or greater than the thickness of the upper metal layer 26a shown in
Then, using the upper metal layers 26a, 26c as masks, the foundation metal layer 44 located in parts other than parts under the upper metal layers 26a, 26c is etched and removed. Thus, as shown in
Then, as shown in
Then, solder balls 29a, 29c are formed in and above the openings 28a, 28c of the overcoat film 27 so that these solder balls are connected to the predetermined four points of the upper surface of the upper wiring 24a and to the connection pad portion of the upper wiring 24c. Further, as shown in
In this case, openings 23a, 23b of an upper insulating film 22 are provided in parts corresponding to the upper surfaces of the columnar electrodes 13a, 13b except for the peripheral portions thereof. Further, upper wirings 24a, 24b are connected, via the openings 23a, 23b of the upper insulating film 22, to the upper surfaces of the columnar electrodes 13a, 13b except for the peripheral portions thereof.
As described above, since the power supply voltage columnar electrode 13a and the ground voltage columnar electrode 13 of the semiconductor construct 2 are solidly formed in this semiconductor device, the columnar electrodes 13a, 13b can be reduced in resistance, and current capacity can thus be further improved.
The semiconductor construct 2, which is generally called a CSP, includes a silicon substrate (semiconductor substrate) 4. The lower surface of the silicon substrate 4 is bonded to the center of the upper surface of the base plate 1 through the bonding layer 3. Elements (not shown) such as a transistor, diode, resistor, and condenser that constitute an integrated circuit having a predetermined function are formed on the upper surface of the silicon substrate 4. Connection pads 5a, 5b, 5c are provided on the peripheral portion of the upper surface of the silicon substrate 4. The connection pads 5a, 5b, 5c are made of, for example, an aluminum-based metal, and connected to the elements of the integrated circuit.
Here, by way of example, the four connection pads indicated by the sign 5a and arranged on the upper left part of the silicon substrate 4 in
A passivation film (insulating film) 6 made of, for example, silicon oxide is provided on the upper surface of the silicon substrate 4 except for the peripheral portion of the silicon substrate 4 and the centers of the connection pads 5a, 5b, 5c. The centers of the connection pads 5a, 5b, 5c are exposed through openings 7a, 7b, 7c provided in the passivation film 6. A protective film (insulating film) 8 made of, for example, a polyimide resin is provided on the upper surface of the passivation film 6. Openings 9a, 9b, 9c are provided in parts of the protective film 8 that correspond to the openings 7a, 7b, 7c of the passivation film 6.
Wirings 10a, 10b, 10c are provided on the upper surface of the protective film 8. The wirings 10a, 10b, 10c have a double-layer structure composed of foundation metal layers 11a, 11b, 11c and upper metal layers 12a, 12b, 12c. The foundation metal layers 11a, 11b, 11c are made of, for example, copper and provided on the upper surface of the protective film 8. The upper metal layers 12a, 12b, 12c are made of copper and provided on the upper surfaces of the foundation metal layers 11.
In this case, as shown in
The wiring indicated by the sign 10b (common wiring) is solidly disposed on the lower left part of the silicon substrate 4 in a region that has a square planar shape and includes the four ground voltage connection pads 5b. The wiring 10b is connected to all of the four ground voltage connection pads 5b via the openings 7b, 9b of the passivation film 6 and the protective film 8.
The wirings indicated by the sign 10c are disposed in the right region of the silicon substrate 4. Each wiring 10c has a connection portion 10c-1 connected to the normal voltage connection pad 5c via the openings 7c, 9c of the passivation film 6 and the protective film 8, a connection pad portion 10c-2 having a circular planar shape, and an extension line 10c-3 extending between the connection portion 10c-1 and the connection pad portion 10c-2.
Columnar electrodes (common columnar electrodes, first columnar electrodes) 13a made of copper are provided at predetermined four points on the upper surface of the wiring indicated by the sign 10a and having a square planar shape. Columnar electrodes (common columnar electrodes, first columnar electrodes) 13b made of copper are provided at predetermined four points on the upper surface of the wiring indicated by the sign 10b and having a square planar shape. A columnar electrode (second columnar electrode) 13c made of copper is provided on the upper surface of the connection pad portion 10c-2 of the wiring indicated by the sign 10c. Here, as shown in
A sealing film 14 made of, for example, an epoxy resin is provided around the columnar electrodes 13a, 13b, 13c on the upper surface of the protective film 8 including the wirings 10a, 10b, 10c. The columnar electrodes 13a, 13b, 13c are provided so that the upper surfaces thereof are flush with or several μm lower than the upper surface of the sealing film 14. The explanation of the structure of the semiconductor construct 2 is completed now.
An insulating layer 21 in a square frame shape is provided on the upper surface of the base plate 1 around the semiconductor construct 2. For example, the insulating layer 21 is made of a thermosetting resin such as an epoxy resin in which a reinforcer of an inorganic material such as silica fuller is dispersed. Alternatively, the insulating layer 21 is only made of a thermosetting resin such as an epoxy resin.
An upper insulating film 22 is provided on the upper surfaces of the semiconductor construct 2 and the insulating layer 21. The upper insulating film 22 is made of, for example, a base glass fabric impregnated with a thermosetting resin such as an epoxy resin. Alternatively, the upper insulating film 22 is only made of a thermosetting resin such as an epoxy resin. Openings 23a, 23b, 23c are provided in parts of the upper insulating film 22 that correspond to the centers of the upper surfaces of the columnar electrodes 13a, 13b, 13c of the semiconductor construct 2.
Upper wirings 24a, 24b, 24c are provided on the upper surface of the upper insulating film 22. The upper wirings 24a, 24b, 24c have a double-layer structure composed of foundation metal layers 25a, 25b, 25c and upper metal layers 26a, 26b, 26c. The foundation metal layers 25a, 25b, 25c are made of, for example, copper and provided on the upper surface of the upper insulating film 22. The upper metal layers 26a, 26b, 26c are made of copper and provided on the upper surfaces of the foundation metal layers 25a, 25b, 25c.
In this case, similarly to the wiring of the semiconductor construct 2 indicated by the sign 10c, each of the upper wirings 24a, 24b, 24c includes a connection portion, a connection pad portion, and an extension line extending therebetween. The connection portions of the upper wirings (common upper wirings, first upper wirings) 24a, 24b are connected to the upper surfaces of the columnar electrodes 13a, 13b of the semiconductor construct 2 via the openings 23a, 23b of the upper insulating film 22. The connection portion of the upper wiring (second upper wiring) 24c is connected to the upper surface of the columnar electrode 13c of the semiconductor construct 2 via the opening 23c of the upper insulating film 22.
An overcoat film 27 made of, for example, a solder resist is provided on the upper surface of the upper insulating film 22 including the upper wirings 24a, 24b, 24c. Openings 28a, 28b, 28c are provided in parts of the overcoat film 27 that correspond to the connection pad portions of the upper wirings 24a, 24b, 24c. Solder balls 29a, 29b, 29c are provided in and above the openings 28a, 28b, 28c so that these solder balls are connected to the connection pad portions of the upper wirings 24a, 24b, 24c. Here, as shown in
As described above, in this semiconductor device, the power supply voltage wiring 10a and the ground voltage wiring 10b of the semiconductor construct 2 are solidly formed in a square planar shape, and each connected to all of the four connection pads 5a, 5b. This allows the power supply voltage wiring 10a and the ground voltage wiring 10b not to be burned off even if an excessively high current runs through these wirings.
Here, the sizes of the parts of this semiconductor device are mentioned. The size of the base plate 1 is 3×3 mm. The size of the semiconductor construct 2 is 2×2 mm. The line width of the extension line 10c-3 of the wiring 10c of the semiconductor construct 2 is 20 μm. The diameter of the columnar electrode 13a, 13b, 13c of the semiconductor construct 2 is 0.2 mm. The pitch of the columnar electrode 13a, 13b, 13c is 0.4 mm. The diameter of the opening 23 of the upper insulating film 22 is 100 μm. The diameter of the connection pad portion of the upper wiring is 0.3 mm. The pitch of the connection pad portico of the upper wiring is 0.65 mm.
In the meantime, since the base plate 1 is greater in size than the semiconductor construct 2, even if the extension line 10c-3 of the normal voltage wiring 10c of the semiconductor construct 2 has a relatively small line width of 20 μm, the extension line of the upper wiring 24a, 24b, 24c can have a relatively great line width of about 100 μm. This makes it possible to prevent the power supply voltage upper wiring 24a and the ground voltage upper wiring 24b from being easily burned off even if an excessively high current runs through these upper wirings.
Now, one example of a method of manufacturing this semiconductor device is described. First, one example of a method of manufacturing the semiconductor construct 2 is described. In this case, the ground voltage connection pad 5b and associated parts are substantially similar to the power supply voltage connection pads 5a and associated parts, and are therefore not described.
First, as shown in
In this case, the thickness of the semiconductor wafer 31 is greater than the thickness of a silicon substrate 4 shown in
Then, as shown in
Then, a plating resist film 34 made of a positive liquid resist is patterned and formed on the upper surface of the foundation metal layer 33. In this case, openings 35a, 35c are formed in parts of the plating resist film 34 corresponding to regions where upper metal layers 12a, 12c are to be formed. Further, electrolytic plating with copper is carried out using the foundation metal layer 33 as a plating current path, thereby forming the upper metal layers 12a, 12c on the upper surface of the foundation metal layer 33 within the openings 35a, 35c in the plating resist film 34. Subsequently, the plating resist film 34 is released.
Then, as shown in
Then, electrolytic plating with copper is carried out using the foundation metal layer 33 as a plating current path. As a result, the columnar electrodes 13a, 13c are formed on the upper surface of the upper metal layer 12a within the openings 37a in the plating resist film 36 and on the upper surface of the connection pad portion of the upper metal layer 12c within the openings 37c in the plating resist film 36. Subsequently, the plating resist film 36 is released.
Then, using the upper metal layers 12a, 12c as masks, the foundation metal layer 33 located in parts other than parts under the upper metal layers 12a, 12c is etched and removed. Thus, as shown in
Then, as shown in
Then, the upper side of the sealing film 14 is properly ground to expose the upper surfaces of the columnar electrodes 13a, 13c as shown in
Then, as shown in
Now, one example of how to manufacture the semiconductor device shown in
First, as shown in
Then, the bonding layers 3 fixedly attached to the lower surfaces of the silicon substrates 4 of the semiconductor constructs 2 are bonded to semiconductor construct placement regions on the upper surface of the base plate 1 to leave space in between. In this bonding, the bonding layers 3 are fully cured by heating and pressurization.
Then, as shown in
Then, an upper insulating film formation sheet 22a is disposed on the upper surfaces of the semiconductor construct 2 and the insulating layer formation sheet 21a. The upper insulating film formation sheet 22a is prepared by impregnating, for example, glass fabric with a thermosetting resin such as an epoxy resin, and semi-curing the thermosetting resin into a sheet form.
Then, the insulating layer formation sheet 21a and the upper insulating film formation sheet 22a are heated and pressurized from the top and bottom using a pair of heating/pressurization plates 42, 43. By subsequent cooling, an insulating layer 21 in a square frame shape is formed on the upper surface of the base plate 1 around the semiconductor construct 2, and an upper insulating film 22 is formed on the upper surfaces of the semiconductor construct 2 and the insulating layer 21. In this case, the upper surface of the upper insulating film 22 is pressed by the lower surface of the upper heating/pressurization plate 42, and is therefore a flat surface.
Then, as shown in
Then, as shown in
Then, a plating resist film 45 is patterned and formed on the upper surface of the foundation metal layer 44. In this case, openings 46a, 46c are formed in parts of the plating resist film 45 corresponding to regions where upper metal layers 26a, 26c are to be formed. Further, electrolytic plating with copper is carried out using the foundation metal layer 44 as a plating current path, thereby forming the upper metal layers 26a, 26c on the upper surface of the foundation metal layer 44 within the openings 46a, 46c in the plating resist film 45.
Then, the plating resist film 45 is released. Further, using the upper metal layers 26a, 26c as masks, the foundation metal layer 44 located in parts other than parts under the upper metal layers 26a, 26c is etched and removed. Thus, as shown in
Then, as shown in
Then, solder balls 29a, 29c are formed in and above the openings 28a, 28c of the overcoat film 27 so that these solder balls are connected to the connection pad portions of the upper wirings 24a, 24c. Further, as shown in
As described above, since the power supply voltage upper wiring 24a and the ground voltage upper wiring 24b are solidly formed in this semiconductor device, the upper wirings 24a, 24b can be reduced in resistance, and current capacity can thus be improved, as compared with the semiconductor device shown in
Thus, since this semiconductor device has nine power supply voltage columnar electrodes 13a and nine ground voltage columnar electrodes 13b, the parts corresponding to the columnar electrodes 13a, 13b can be reduced in resistance as a whole, and current capacity can thus be improved, as compared with the semiconductor device shown in
One end of the first upper wiring 24A is connected to a columnar electrode 13 via an opening 23A of the first upper insulating film 22A. One end of the second upper insulating film 24B is connected to the connection pad portion of the first upper wiring 24A via an opening 23B of the second upper insulating film 22B. A solder ball 29 is connected to the connection pad portion of the second upper insulating film 24B via an opening 28 of an overcoat film 27. In addition, three or more upper insulating films and three or more upper wirings may be provided.
Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.
Number | Date | Country | Kind |
---|---|---|---|
2009-158618 | Jul 2009 | JP | national |
2009-158622 | Jul 2009 | JP | national |
2009-158629 | Jul 2009 | JP | national |
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7719116 | Wakabayashi et al. | May 2010 | B2 |
7867828 | Jobetto | Jan 2011 | B2 |
7969006 | Lin et al. | Jun 2011 | B2 |
20030015342 | Sakamoto et al. | Jan 2003 | A1 |
20060186524 | Aiba et al. | Aug 2006 | A1 |
20070042594 | Wakabayashi et al. | Feb 2007 | A1 |
Number | Date | Country |
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101091250 | Dec 2007 | CN |
10-242332 | Sep 1998 | JP |
2001-267350 | Sep 2001 | JP |
2006-12885 | Jan 2006 | JP |
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Entry |
---|
Japanese Office Action dated Sep. 1, 2011 (and English translation thereof) in counterpart Japanese Application No. 2009-158622. |
Japanese Office Action dated Sep. 1, 2011 (and English translation thereof) in counterpart Japanese Application No. 2009-158629. |
Chinese Office Action dated Nov. 9, 2011 (and English translation thereof) in counterpart Chinese Application No. 201010222786.3. |
Korean Office Action dated Dec. 15, 2011 (and English translation thereof) in counterpart Korean Application No. 10-2010-0063483. |
Number | Date | Country | |
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20110001238 A1 | Jan 2011 | US |