Patent Application
20180076367
This disclosure relates to an optoelectronic component and a method of producing an optoelectronic component.
DE 10 2009 036 621 A1 discloses a method of producing optoelectronic components in which optoelectronic semiconductor chips are embedded in a molded body covering all the side surfaces of the optoelectronic semiconductor chips. Upper and lower sides of the optoelectronic semiconductor chips remain exposed. Electric through contacts can be embedded in the molded body together with the optoelectronic semiconductor chips.
I provide an optoelectronic component including an optoelectronic semiconductor chip at least partly enclosed by a molded body, wherein a front side of the molded body is covered by a reflecting film, at least in some sections, and a section of the reflecting film is enclosed between the optoelectronic semiconductor chip and the molded body.
I also provide a method of producing an optoelectronic component including providing a carrier having an upper side which has an elevated and a recessed region; arranging an optoelectronic semiconductor chip between the elevated region of the upper side of the carrier and a reflecting film, wherein a front side of the optoelectronic semiconductor chip faces the carrier, and a rear side of the optoelectronic semiconductor chip faces the reflecting film; forming a molded body on a rear side of the reflecting film, facing away from the optoelectronic semiconductor chip, wherein the optoelectronic semiconductor chip is at least partly enclosed by the molded body, wherein a section of the reflecting film is enclosed between the optoelectronic semiconductor chip and the molded body; and detaching the molded body, the reflecting film and the optoelectronic semiconductor chip from the upper side of the carrier, wherein at least part of the reflecting film remains on a front side of the molded body.
My optoelectronic component comprises an optoelectronic semiconductor chip, which is at least partly enclosed by a molded body. A front side of the molded body is covered by a reflecting film, at least in some sections. A section of the reflecting film is enclosed between the optoelectronic semiconductor chip and the molded body.
The reflecting film covering the front side of the molded body, at least in some sections, can advantageously increase the reflectance of the front side of the molded body of the optoelectronic component. As a result, light losses effected by absorption on the front side of the molded body are advantageously reduced in the optoelectronic component, which means that the optoelectronic component can have a high efficiency.
As a result of the inclusion of a section of the reflecting film between the optoelectronic semiconductor chip and the molded body, the reflecting film reaches until directly on a radiation emission face of the optoelectronic semiconductor chip but does not cover the latter. In this way, optimal coverage of the front side of the molded body of the optoelectronic component is advantageously achieved. The precise relative alignment between the radiation emission face of the optoelectronic semiconductor chip and the reflecting film can advantageously result in a self-adjusting manner during production of the optoelectronic component.
The molded body may form on its front side a reflector, which is elevated above a front side of the optoelectronic semiconductor chip. The reflector is covered here by the reflecting film, at least in some sections. The reflector formed by the molded body of the optoelectronic component can effect focusing of electromagnetic radiation emitted by the optoelectronic component. As a result of the covering of the reflector, at least in some sections, by the reflecting film, the reflector of the optoelectronic component advantageously has beneficial reflection characteristics.
A front side and a rear side of the optoelectronic semiconductor chip may not be covered by the molded body. As a result, making electric contact with electric contact pads of the optoelectronic semiconductor chip arranged on the front side and/or the rear side of the optoelectronic semiconductor chip is advantageously made easier.
The molded body may have an electrically conductive through contact extending from the front side to a rear side of the molded body. There is here an electrically conductive connection between an electric contact pad of the optoelectronic semiconductor chip, which is arranged on a front side of the optoelectronic semiconductor chip, and the electrically conductive through contact. Advantageously, the electrically conductive through contact of the optoelectronic component permits electric contact to be made with the electric contact pad of the optoelectronic semiconductor chip on the rear side of the molded body, the electric contact pad being arranged on the front side of the optoelectronic semiconductor chip. As a result, the optoelectronic component may, for example, be suitable as an SMD component for surface mounting, for example, for surface mounting by reflow soldering.
A method of producing an optoelectronic component comprises steps of providing a carrier having an upper side having an elevated and a recessed region, arranging an optoelectronic semiconductor chip between the elevated region of the upper side of the carrier and a reflecting film, wherein a front side of the optoelectronic semiconductor chip faces the carrier, and a rear side of the optoelectronic semiconductor chip faces the reflecting film, forming a molded body on a rear side of the reflecting film, facing away from the optoelectronic semiconductor chip, wherein the optoelectronic semiconductor chip is at least partly enclosed by the molded body, wherein a section of the reflecting film is enclosed between the optoelectronic semiconductor chip and the molded body, and detaching the molded body, the reflecting film and the optoelectronic semiconductor chip from the upper side of the carrier, wherein at least part of the reflecting film remains on a front side of the molded body.
Advantageously, the method permits production of an optoelectronic component having a molded body, the front side of which is covered by the reflecting film, at least in some sections. As a result, the front side of the molded body of the optoelectronic component that can be obtained by the method has a high reflectance, which means that light losses caused by absorption on the front side of the molded body are reduced.
The fact that, during the forming of the molded body, a section of the reflecting film is enclosed between the optoelectronic semiconductor chip and the molded body results in precise alignment of the reflecting film and of the optoelectronic semiconductor chip relative to each other, in which the reflecting film reaches until directly on a radiation emission face of the optoelectronic semiconductor chip, without covering the latter. This precise alignment advantageously results automatically and in a self-adjusting manner in the method, which permits simple and economical performance of the method.
The molded body may be formed such that the front side of the molded body at least partly reproduces the upper side of the carrier. The forming of the upper side of the carrier used in this method, having an elevated and a recessed region, advantageously makes it possible as a result to three-dimensionally model the front side of the molded body of the optoelectronic component that can be obtained by the method. Here, the front side of the molded body results as a negative of the shape of the upper side of the carrier, at least in some sections and approximately. As a result, it is made possible, for example, to form the front side of the molded body of the optoelectronic component that can be obtained by the method as a reflector that can effect focusing of electromagnetic radiation emitted by the optoelectronic component.
The molded body may be formed such that the front side of the optoelectronic semiconductor chip is not covered by the material of the molded body. As a result, electromagnetic radiation emitted at the front side of the optoelectronic semiconductor chip can advantageously be emitted by the optoelectronic component that can be obtained by the method. In addition, it is advantageously made possible to make contact with an electric contact pad of the optoelectronic semiconductor chip that is possibly arranged on the front side of the optoelectronic semiconductor chip. As a result of the fact that the front side of the optoelectronic semiconductor chip is already not covered by the material of the molded body during forming of the molded body, it is advantageously not necessary to expose the front side of the optoelectronic semiconductor chip after the forming of the molded body.
The reflecting film may be connected integrally to the rear side of the optoelectronic semiconductor chip before forming the molded body. Advantageously, the reflecting film in the optoelectronic component that can be obtained by the method can then be used as a rear-side metallization of the optoelectronic semiconductor chip. The integral connection of the reflecting film to the rear side of the optoelectronic semiconductor chip can be carried out, for example, by a method similar to wafer bonding, laser welding or friction welding.
The carrier may have at least one opening, through which the reflecting film is sucked onto the upper side of the carrier before forming the molded body. Advantageously, in this way particularly good reproduction of the upper side of the carrier by the front side of the molded body can be achieved. In particular, as a result of sucking the reflecting film onto the upper side of the carrier, a bubble-free arrangement of the reflecting film on the front side of the molded body of the optoelectronic component that can be attained by the method can be ensured.
The reflecting film may have at least one opening. Here, during forming of the molded body, part of the material of the molded body passes through the opening in the reflecting film. In this way, the reflecting film in the area of the opening of the reflecting film is anchored in the molded body, which means that a particularly stable connection between the reflecting film and the front side of the molded body of the optoelectronic component that can be obtained by the method can be achieved.
The method may comprise a further step of arranging a wavelength-converting material over the front side of the optoelectronic semiconductor chip. The wavelength-converting material can, for example, have wavelength-converting particles embedded in a matrix material, for example, a silicone. The wavelength-converting material can be provided to convert the electromagnetic radiation emitted by the optoelectronic semiconductor chip of the optoelectronic component that can be obtained by the method at least partly into electromagnetic radiation of a different, typically higher, wavelength.
The reflecting film may have an electrically conductive first film section and an electrically conductive second film section insulated with respect to the first film section. Advantageously, in the optoelectronic component that can be obtained by the method, the reflecting film can also be used for the electric wiring of the optoelectronic component.
An electrically conductive element may be arranged on the rear side of the second film section of the reflecting film. The molded body is formed here such that, after the forming of the molded body, the electrically conductive element is accessible on a rear side of the molded body. In addition, following the detachment from the carrier, a further step is carried out to create an electrically conductive connection between an electric contact pad of the optoelectronic semiconductor chip, that is arranged on the front side of the optoelectronic semiconductor chip, and the electrically conductive element. Advantageously, in the optoelectronic component that can be obtained by the method, the electrically conductive element then constitutes an electrically conductive connection between the electric contact pad of the optoelectronic semiconductor chip, that is arranged on the front side of the optoelectronic semiconductor chip, and the rear side of the molded body. This makes it possible to make electric contact with the optoelectronic component that can be obtained by the method on the rear side of the molded body. The electrically conductive element can already be directly accessible on the rear side of the molded body after forming the molded body. The electrically conductive element can, however, also be made accessible after forming the molded body by partial removal of the material of the molded body on the rear side of the molded body.
An electrically conductive via chip may be arranged between the upper side of the carrier and the second film section of the reflecting film and is enclosed by the molded body. In addition, following detachment from the carrier, a further step is carried out to create an electrically conductive connection between an electric contact pad of the optoelectronic semiconductor chip, that is arranged on the front side of the optoelectronic semiconductor chip, and the via chip. As a result, the via chip in the optoelectronic component that can be obtained by the method provides an electrically conductive connection between the electric contact pad of the optoelectronic semiconductor chip, that is arranged on the front side of the optoelectronic semiconductor chip, and the rear side of the molded body, which makes it possible to make electric contact with the optoelectronic component that can be obtained by the method on the rear side of the molded body.
A via chip may be arranged between the upper side of the carrier and the second film section of the reflecting film and is enclosed by the molded body. Part of the second film section is enclosed here between the via chip and the molded body. Following the detachment from the carrier, a step is additionally carried out to create an electrically conductive connection between an electric contact pad of the optoelectronic semiconductor chip, that is arranged on the front side of the optoelectronic semiconductor chip, and the second film section. Advantageously, as a result, in the optoelectronic component that can be obtained by this method, the second film section forms an electrically conductive connection between the electric contact pad of the optoelectronic semiconductor chip, that is arranged on the front side of the optoelectronic semiconductor chip, and the rear side of the molded body. This makes it possible to make electric contact with the optoelectronic component that can be obtained by the method on the rear side of the molded body.
The carrier may be provided with a further elevated region. The recessed region is arranged here between the elevated region and the further elevated region. The first film section is arranged in contact with the rear side of the optoelectronic semiconductor chip. The second film section is arranged to rest on the further elevated region. Following the detachment from the carrier, a step is carried out to create an electrically conductive connection between an electric contact pad of the optoelectronic semiconductor chip, that is arranged on the front side of the optoelectronic semiconductor chip, and the second film section. Advantageously, in the optoelectronic component that can be obtained by this method, the second film section provides an electrically conductive connection between the electric contact pad of the optoelectronic semiconductor chip, that is arranged on the front side of the optoelectronic semiconductor chip, and the rear side of the molded body. This makes it possible to make electric contact with the optoelectronic component on the rear side of the molded body.
The method may comprise further steps of exposing the rear side of the optoelectronic semiconductor chip and arranging a metallization on the rear side of the optoelectronic semiconductor chip. The metallization arranged on the rear side of the optoelectronic semiconductor chip can be used to make electric contact with the optoelectronic component in the optoelectronic component that can be obtained by the method.
Exposure of the rear side of the optoelectronic semiconductor chip may comprise removal of part of the molded body on a rear side of the molded body. The removal of part of the molded body can be carried out, for example, by a grinding process.
The above-described characteristics, features and advantages and the manner in which they are achieved become clearer and considerably more understandable in conjunction with the following description of the examples, which are explained in more detail in conjunction with the drawings.
The upper side 401 of the carrier 400 has elevated regions 410 and regions 420 recessed with respect to the elevated regions 410. The elevated regions 410 form islands delimited by the recessed regions 420. The elevated regions 410 can, for example, be formed rectangularly or in the form of circular disks. The recessed regions 420 form trenches running around the elevated regions 410. The recessed regions 420, for example, have V-enclosed cross sections.
A film 440 is arranged on the upper side 401 of the carrier 400. The film 440 can, for example, be a double-sided adhesive film. The film 440 follows the topography of the upper side 401 of the carrier 400 and covers both the elevated regions 410 and the recessed regions 420. It is expedient that the film 440 has a low thickness as compared with the lateral dimensions of the elevated regions 410 and the recessed regions 420 so that the topography of the upper side 401 of the carrier 400 is changed only a little by the film 440.
Optoelectronic semiconductor chips 100 are arranged on the film 440 over the upper side 401 of the carrier 400. The optoelectronic semiconductor chips 100 can be, for example, light-emitting diode chips (LED chips).
The optoelectronic semiconductor chips 100 are arranged above the elevated regions 410 of the carrier 400. In the example illustrated in
Each optoelectronic semiconductor chip 100 has a front side 101 and a rear side 102 opposite the front side 101. The optoelectronic semiconductor chips 100 are arranged over the upper side 401 of the carrier 400 such that the front sides 101 of the optoelectronic semiconductor chips 100 face the upper side 401 of the carrier 400.
A reflecting film 500 has been arranged over the rear sides 102 of the optoelectronic semiconductor chips 100 arranged over the upper side 401 of the carrier 400. The reflecting film 500 can, for example, have been stretched over the optoelectronic semiconductor chips 100. The reflecting film 500 has a front side 501 facing the optoelectronic semiconductor chips 100 and a rear side 502 opposite the front side 501. The front side 501 of the reflecting film 500 is in contact with the rear sides 102 of the optoelectronic semiconductor chips 100. The optoelectronic semiconductor chips 100 are therefore arranged between the upper side 401 of the carrier 400 and the front side 501 of the reflecting film.
The reflecting film 500 has a high optical reflectance, at least on its front side 501. The reflecting film 500 can, for example, be formed as a metal foil and, for example, have aluminum or silver. However, the reflecting film 500 can also be formed as a plastic film, for example, and, for example, have a metallic coating which, for example, has aluminum or silver.
The reflecting film 500 has film sections 510 resting on the rear sides 102 of the optoelectronic semiconductor chips 100 and interposed film sections 520 arranged between the close-fitting film sections 510. The interposed film sections 520 are stretched between the close-fitting film sections 510 of the reflecting film 500.
The close-fitting film sections 510 of the reflecting film 500 can connect integrally to the rear sides 102 of the optoelectronic semiconductor chips 100. The integral connection between the close-fitting film sections 510 of the reflecting film 500 and the rear sides 102 of the optoelectronic semiconductor chips 100 can have been produced, for example, by a method similar to wafer bonding, laser welding or friction welding. It is also possible to arrange the optoelectronic semiconductor chips 100 on the front side 501 of the reflecting film 500 first and only then to connect the rear sides 102 of the optoelectronic semiconductor chips 100 integrally to the close-fitting film sections 510 of the reflecting film 500, and to arrange the reflecting film 500 with the optoelectronic semiconductor chips 100 arranged thereon over the upper side 401 and the carrier 400 in the manner illustrated in
A molded body 600 has been formed on the rear side 502 of the reflecting film 500 facing away from the optoelectronic semiconductor chips 100. The material of the molded body 600 has at least partly enclosed the optoelectronic semiconductor chips 100. The interposed film sections 520 of the reflecting film 500 have been forced by the material of the molded body 600 in the direction toward the upper side 401 of the carrier 400 so that substantially no empty space has remained between the film 440 arranged on the upper side 401 of the carrier 400 and the front side 501 of the reflecting film 500. This can have been assisted during forming of the molded body 600 by the reflecting film 500 having been sucked onto the upper side 401 of the carrier 400 through one or more openings 450 arranged in the carrier. However, the openings 450 do not necessarily have to be present.
A front side 601 of the molded body 600, facing the upper side 401 of the carrier 400, at least partly reproduces the upper side 401 of the carrier 400 having the elevated regions 410 and the recessed regions 420 so that the front side 601 of the molded body 600 forms a negative of the upper side 401 of the carrier 400.
Parts of the interposed film sections 520 of the reflecting film 500 have been enclosed between the front side 601 of the molded body 600 and the film 440 arranged on the upper side 401 of the carrier 400. Further parts of the interposed film sections 520 of the reflecting film 500 have been enclosed between the molded body 600 and the side flanks of the optoelectronic semiconductor chips 100 that extend between the front sides 101 and the rear sides 102 of the optoelectronic semiconductor chips 100, and form enclosed film sections 530. The enclosed film sections 530 are arranged between the film sections 510 resting on the rear sides 102 of the optoelectronic semiconductor chips 100 and the film sections enclosed between the front side 601 of the molded body 600 and the film 440 on the upper side 401 of the carrier 400.
The molded body 600 has an electrically insulating molding material, for example, a plastic material in particular, for example, an epoxy resin. The molded body 600 can have been formed by a shaping method (molding method), in particular, for example, by pressure injection molding (transfer molding) or by compression molding.
In the example shown in
The molded body 600, the reflecting film 500 and the optoelectronic semiconductor chips 100 embedded in the molded body 600 have been detached jointly from the film 440 arranged on the upper side 401 of the carrier 400. The reflecting film 500 has remained on the molded body 600. In this way, the front side 601 of the molded body 600 is at least partly covered by the reflecting film 500.
Since the front sides 101 of the optoelectronic semiconductor chips 100 were protected by the film 440 arranged on the upper side 401 of the carrier 400 during the forming of the molded body 600, the front sides 101 of the optoelectronic semiconductor chips 100 have not been covered by the material of the molded body 600 and are exposed following the detachment of the molded body 600 from the upper side 401 of the carrier 400.
Since the front side 601 of the molded body 600 has reproduced the upper side 401 of the carrier 400, the molded body 600 forms on its front side 601 reflectors 610 elevated above the front sides 101 of the optoelectronic semiconductor chips. The reflectors 610 on the front side 601 of the molded body 600 are covered by the reflecting film 500, which means that the reflectors 610 have a high optical reflectance. Each optoelectronic semiconductor chip 100 is assigned a reflector 610. The respective reflector 610 is provided to focus electromagnetic radiation emitted from the optoelectronic semiconductor chip 100 at the front side 101 thereof.
Part of the material of the molded body 600 on the rear side 602 of the molded body 600, has been removed. In this way, the rear sides 102 of the optoelectronic semiconductor chips 100 have been exposed. The film sections 510 of the reflecting film 500 previously resting on the rear sides 102 of the optoelectronic semiconductor chips 100 have also been removed. The exposure of the rear sides 102 of the optoelectronic semiconductor chips 100 can be carried out, for example, by a grinding process.
If the reflecting film 500 has an electrically conductive material, then the film sections 510 of the reflecting film 500 resting on the rear sides 102 of the optoelectronic semiconductor chips 100 do not necessarily have to be removed. In particular when the film sections 510 of the reflecting film 500 resting on the rear sides 102 of the optoelectronic semiconductor chips 100 have previously been connected integrally to the rear sides 102 of the optoelectronic semiconductor chips 100, the film sections 510 of the reflecting film 500 resting on the rear sides 102 of the optoelectronic semiconductor chips 100 can remain wholly or partly on the rear sides 102 of the optoelectronic semiconductor chips 100.
The exposure of the rear sides 102 of the optoelectronic semiconductor chips 100 or the film sections 510 of the reflecting film 500 resting on the rear sides 102 of the optoelectronic semiconductor chips 100 can alternatively also be carried out even before detachment of the molded body 600 from the carrier 400.
Metallizations 700 have been arranged on the rear sides 102 of the optoelectronic semiconductor chips 100. The metallizations 700 produce electrically conductive contacts to rear-side contact pads 120 arranged on the rear sides 102 of the optoelectronic semiconductor chips 100. The metallizations 700 can be used to make electrical contact with the optoelectronic semiconductor chips 100 after processing has been completed.
If the film sections 510 of the reflecting film 500 resting on the rear sides 102 of the optoelectronic semiconductor chips 100 have remained on the rear sides 102 of the optoelectronic semiconductor chips 100, then the arrangement of the metallizations 700 can be omitted. In this case, the film sections 510 of the reflecting film 500 resting on the rear sides 102 of the optoelectronic semiconductor chips 100 can perform the task of the metallizations 700.
The metallizations 700 can also be arranged even before the detachment of the molded body 600 from the carrier 400.
A wavelength-converting material 710 has been arranged over the front sides 101 of the optoelectronic semiconductor chips 100. The wavelength-converting material 710 can have been applied, for example, by a casting method, by injecting, by spraying or sputtering. The wavelength-converting material 710 can, for example, wholly or partly fill the reflectors 610 formed on the front side 601 of the molded body 600.
The wavelength-converting material 710 can, for example, have a matrix material, in particular silicone, for example, and wavelength-converting particles embedded in the matrix material. The wavelength-converting material 710 is provided to convert electromagnetic radiation emitted by the optoelectronic semiconductor chips 100 at least partly into electromagnetic radiation of another, for example, higher wavelength. The optoelectronic semiconductor chips 100 can, for example, be configured to emit electromagnetic radiation with a wavelength from the blue or ultraviolet spectral range. The wavelength-converting material 710 can, for example, be provided to convert electromagnetic radiation emitted by the optoelectronic semiconductor chips 100 into electromagnetic radiation with a wavelength from the yellow spectral range.
The arrangement of the wavelength-converting material 710 over the front sides 101 of the optoelectronic semiconductor chips 100 can also be omitted. Instead of the wavelength-converting material 710, another potting material can optionally be arranged over the front sides 101 of the optoelectronic semiconductor chips 100.
The molded body 600 has been divided up to obtain a plurality of optoelectronic components 10. Each optoelectronic component 10 has a section of the molded body 600 with a reflector 610 and an optoelectronic semiconductor chip 100 embedded in the section of the molded body 600. The sections of the molded body 600 of the individual optoelectronic components 10 will likewise be designated as molded bodies 600 below, for simplicity.
If the optoelectronic semiconductor chips 100 of the optoelectronic components 10 have front-side electric contact pads on their front sides 100, then electrically conductive through contacts can be embedded in the molded bodies 600 of the optoelectronic components 10 to produce electrically conductive connections between the front-side contact pads of the optoelectronic semiconductor chips 100 and the rear sides 602 of the molded bodies 600. In the following text, by using the
In each case, one of the optoelectronic semiconductor chips 100 is arranged over each elevated region 410 of the upper side 401 of the carrier 400. In addition, protective chips 200 and via chips 300 are arranged over the outer regions 425. Each optoelectronic semiconductor chip 100 is assigned a protective chip 200 and a via chip 300.
The protective chips 200 can be used to protect the optoelectronic semiconductor chips 100 against damage by electrostatic discharges. The protective chips 200 can have protective diodes, for example. Each protective chip 200 has a front side 201 and a rear side 202 opposite the front side 201. The protective chips 200 are arranged on the film 440 over the outer regions 425 of the upper side 401 of the carrier 400 such that the front sides 201 of the protective chips 200 face the upper side 401 of the carrier 400. The protective chips 200 can also be omitted.
The via chips 300 each have a front side 301 and a rear side 302 opposite the front side 301. Each via chip 300 is arranged on the film 440 over an outer region 425 of the upper side 401 of the carrier 400 such that the front side 301 faces the upper side 401 of the carrier 400.
The via chips 300 can have an electrically conductive or an electrically insulating material. If the via chips 300 have an electrically conductive material, they can, for example, have a metal or a doped semiconductor material. If the via chips 300 are non-conductive, then the via chips 300 can, for example, have a glass, plastic or a ceramic. In this case, the via chips 300 can, for example, also be formed as non-conductive spheres.
Between their front sides 201, 301 and their rear sides 202, 302, the protective chips 200 and the via chips 300 have a thickness which corresponds as exactly as possible to the thickness of the optoelectronic semiconductor chips 100 between the front sides 101 and the rear sides 102 of the latter.
The reflecting film 500 has been arranged over the rear sides 102, 202, 302 of the optoelectronic semiconductor chips 100, the protective chips 200 and the via chips 300.
In the example shown in
In addition, the reflecting film 500 in the example shown in
The reflecting film 500 covers the front side 601 of the molded body 600 apart from those regions in which the front sides 101 of the optoelectronic semiconductor chips 100, the front sides 201 of the protective chips 200 and the front sides 301 of the via chips 300 are exposed. In particular, the reflecting film 500 covers the reflectors 610, formed in the recessed regions 420 of the upper side 401 of the carrier 400, on the front side 601 of the molded body 600.
In the regions of the openings 560 in the reflecting film 500, during the forming of the molded body 600, part of the material of the molded body 600 passes through the openings 560 in the reflecting film 500, by which anchorages 620 have been formed, at which the reflecting film 500 is anchored in the material of the molded body 600. This achieves a situation where the reflecting film 500 is fixed particularly reliably to the front side 601 of the molded body 600.
In the processing state shown in
In a following processing step, once more the metallization 700 can be arranged on the rear side 102 of the optoelectronic semiconductor chip 100 or on the first film section 540 arranged on the rear side 102 of the optoelectronic semiconductor chip 100 to make electric contact with the rear-side contact pad 120 of the optoelectronic semiconductor chip 100 that is located on the rear side 102 of the optoelectronic semiconductor chip 100.
If the via chip 300 has an electrically conductive material, then the via chip 300 forms an electrically conductive through contact 310 extending through the molded body 600 from the front side 601 to the rear side 602 of the molded body 600. In this case, in a following processing step a further metallization can be arranged on the rear side 302 of the via chip 300 or on the second film section 550 covering the rear side 302 of the via chip 300 to make electric contact with the via chip 300 on the rear side 602 of the molded body 600. In addition, in this case, in a further following processing step, which will be explained below by way of example using
If the via chip 300 has a non-conductive material, then a part of the second film section 550 enclosed between the via chip and the material of the molded body 600 forms the electrically conductive through contact 310 extending through the molded body 600 between the front side 601 and the rear side 602. In this case, the part of the second film section 550 that covers the rear side 302 of the via chip 300 expediently remains on the rear side 302 of the via chip 300. In addition, in this case, a metallization can also be provided in the region of the rear side 302 of the via chip 300. Furthermore, in this case on the front side 601 of the molded body 600, an electrically conductive connection is created between the front-side contact pad 110 of the optoelectronic semiconductor chip 100 and the second film section 550 to create an electrically conductive connection between the metallization arranged in the region of the rear side 302 of the via chip 300 and the front-side contact pad 110 of the optoelectronic semiconductor chip 100.
The rear side 202 of the protective chip 200 electrically conductively connects via the electrically conductive first film section 540 of the reflecting film 500 to the rear-side contact pad 120 of the optoelectronic semiconductor chip 100 that is arranged on the rear side 102 of the optoelectronic semiconductor chip 100. The front side 201 of the protective chip 200 connects via a further electrically conductive connection on the front side 601 of the molded body 600 to the front-side contact pad 110 of the optoelectronic semiconductor chip 100 that is arranged on the front side 101 of the optoelectronic semiconductor chip 100 and/or to the through contact 310. The protective chip 200 then connects electrically in parallel with the optoelectronic semiconductor chip 100 and can protect the optoelectronic semiconductor chip 100 against damage by electrostatic discharges.
The further processing in the method illustrated by using
The reflecting film 500 again has electrically conductive first film sections 540 and electrically conductive second film sections 550 that are insulated with respect to the first film sections 540. In addition, the reflecting film 500 once more has openings 560, which are each arranged between a first film section 540 and a second film section 550, but can also be omitted.
Each electrically conductive first film section 540 is in contact with the rear side 102 and the rear-side contact pad 120, that is arranged on the rear side 102, of an optoelectronic semiconductor chip 100, and with the rear side 202 of a protective chip 200.
The second film sections 550 in the example shown in
As in the illustration of
The reflecting film 500 has been arranged over the rear sides 102 of the optoelectronic semiconductor chips 100 and over the further elevated regions 430 of the carrier 400. The front side 501 of the reflecting film 500 rests both on the rear sides 102 of the optoelectronic semiconductor chips 100 and also on the film 440 over the further elevated regions 430 of the upper side 401 of the carrier 400.
The reflecting film 500 is once more subdivided into electrically conductive first film sections 540 and electrically conductive second film sections 550 that are insulated electrically with respect to the first film sections 540. In each case, a first film section 540 rests on the rear side 102 of an optoelectronic semiconductor chip 100, while the associated second film section 550 is arranged over the further elevated region 430 of the upper side 401 of the carrier 400 which is assigned to the respective optoelectronic semiconductor chip 100.
The molded body 600 has been formed on the rear side 502 of the reflecting film 500 that faces away from the optoelectronic semiconductor chips 100. Once more, the molded body 600 has been formed such that its front side 601 at least partly reproduces the upper side 401 of the carrier 400.
On the rear side 602 of the molded body 600, part of the material of the molded body 600 has been removed so that, in each optoelectronic semiconductor chip 100, the first film section 540 of the reflecting film 500 that is arranged on the rear side 102 is now exposed.
In addition, on the rear side 602 of the molded body 600, the second film sections 550 arranged over the further elevated regions 430 of the upper side 401 of the carrier 400 during forming of the molded body 600 have been exposed. As a result, the second film sections 550 now form through contacts 310, which extend through the molded body 600 from the front side 601 of the molded body 600 as far as the rear side 602 of the molded body 600.
In further processing steps, on the front side 601 of the molded body 600, an electrically conductive connection 730 for each optoelectronic semiconductor chip 100 has been created, connecting the front-side contact pad 110 of the optoelectronic semiconductor chip 100 that is arranged on the front side 101 of the respective optoelectronic semiconductor chip 100 to the through contact 310 formed by the respectively associated second film section 550 of the reflecting film 500. To create the electrically conductive connections 730, in each case, first, a dielectric 720 has been arranged over the edge region of the front side 101 of the optoelectronic semiconductor chip 100 and part of the respective first film section 540. Then, the electrically conductive connection 730 was created, extending respectively from the front-side contact pad 110 on the front side 101 of the respective optoelectronic semiconductor chip 100, via the dielectric 720, to the associated second film section 550 on the front side 601 of the molded body 600. The dielectric 720 is used respectively to insulate the electrically conductive connection 730 electrically with respect to the first film section 540 that is connected to the rear-side contact pad 120 of the optoelectronic semiconductor chip 100.
In a further example of the method, the further elevated regions 430 of the carrier 400 project beyond the elevated regions 410 of the carrier 400, differing from the illustration of
My components and methods have been illustrated and described in more detail by using preferred examples. Nevertheless, this disclosure is not restricted to the examples disclosed. Instead, other variations can be derived therefrom by those skilled in the art without departing from the protective scope of the appended claims.
This application claims priority of DE 10 2015 105 486.8, the subject matter of which is incorporated herein by reference.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2015 105 486.8 | Apr 2015 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2016/057509 | 4/6/2016 | WO | 00 |
