Patent Application
20150360242
1. Field of Art
The present disclosure relates to a linear deposition apparatus with replaceable injectors for convenient and economic replacement and maintenance.
2. Description of the Related Art
An atomic layer deposition (ALD) is a thin film deposition technique for depositing one or more layers of material on a substrate. ALD uses two types of chemical, one is a source precursor and the other is a reactant precursor. Generally, ALD includes four stages: (i) injection of a source precursor, (ii) removal of a physical adsorption layer of the source precursor, (iii) injection of a reactant precursor, and (iv) removal of a physical adsorption layer of the reactant precursor.
ALD can be a slow process that can take an extended amount of time or many repetitions before a layer of desired thickness can be obtained. Hence, to expedite the process, a vapor deposition reactor with a unit module (so-called a linear injector), as described in U.S. Patent Application Publication No. 2009/0165715 or other similar devices may be used to expedite ALD process. The unit module includes an injection unit and an exhaust unit for a source material (a source module), and an injection unit and an exhaust unit for a reactant (a reactant module).
An apparatus for performing ALD process is often subject to various contaminants, high temperature, and deposit materials formed by reaction between source material and reactant material. As a result, the parts of apparatus that injects the source precursor or the reactant precursor tend to wears out or become clogged, and eventually may require cleaning or replacement.
Embodiments relate to a replaceable injector including an elongated body, a protruding leg, and an end block. The elongated body is formed with a passage and an injection port formed along a longitudinal direction of the elongated body and an injection. The passage conveys precursor to the injection port. The protruding leg attached to one end of the elongated body and is received in a support hole formed in a module block to support the precursor injector within the module block. The end block us attached to another end of the elongated body and is formed with at least one screw hole to receive at least one screws for securing the end block to the module block.
Embodiments also relate to an injection module assembly including a module block and a plurality of replaceable injectors. The module block is formed with a plurality of openings and a plurality of support holes extending from the plurality of opening. Each of the opening extends along a width of the module.
Embodiments are described herein with reference to the accompanying drawings. Principles disclosed herein may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. In the description, details of well-known features and techniques may be omitted to avoid unnecessarily obscuring the features of the embodiments.
In the drawings, like reference numerals in the drawings denote like elements. The shape, size and regions, and the like, of the drawing may be exaggerated for clarity.
The process chamber enclosed by the walls may be maintained in a vacuum state to prevent contaminants from affecting the deposition process. The process chamber 110 contains a susceptor 128 which receives a substrate 120. The susceptor 128 is placed on a support plate 124 for a sliding movement. The support plate 124 may include a temperature controller (e.g., a heater or a cooler) to control the temperature of the substrate 120. The linear deposition device 100 may also include lift pins (not shown) that facilitate loading of the substrate 120 onto the susceptor 128 or dismounting of the substrate 120 from the susceptor 128.
In one embodiment, the susceptor 128 is secured to brackets 210 that move across an extended bar 138 with screws formed thereon. The brackets 210 have corresponding screws formed in their holes receiving the extended bar 138. The extended bar 138 is secured to a spindle of a motor 114, and hence, the extended bar 138 rotates as the spindle of the motor 114 rotates. The rotation of the extended bar 138 causes the brackets 210 (and therefore the susceptor 128) to make a linear movement on the support plate 124. By controlling the speed and rotation direction of the motor 114, the speed and the direction of the linear movement of the susceptor 128 can be controlled. The use of a motor 114 and the extended bar 138 is merely an example of a mechanism for moving the susceptor 128. Various other ways of moving the susceptor 128 (e.g., use of gears and pinion at the bottom, top or side of the susceptor 128). Moreover, instead of moving the susceptor 128, the susceptor 128 may remain stationary and the IMA 136 may be moved.
The body 312 is formed with openings 308 for receiving precursor injectors 304 and radical injectors 302. The precursor injectors 304 and radical injectors 302 may be mounted into the opening 308 of the body 312 using screws, for example, and the precursor injectors 304 and radical injectors 302 can be removed from the body 312 for cleaning or replacement. By enabling disassembly of the precursor injectors 304 and radical injectors 302 from the body 312, only some of the precursor injectors 304 or the radical injectors 302 can be removed from the IMA 136 for cleaning or replacement while retaining the remaining precursor injectors 304 or the radical injectors 302 and the body 312.
The IMA 136 has a width of Wm and a length of Lm. Each of the openings 308 extend along the width Wm of the IMA 136. Each of the openings 308 extend from the bottom surface to the body 312 to the top surface of the body 312. When mounted, the precursor injector 304 or the radical injector 302 injects radicals or gas at through its bottom while discharging excess precursor or gas through the top as shown by arrows 318.
The protruding leg 540 extends along the length of the radical injector 302. When assembling, the protruding leg 540 is inserted into a support hole formed in the end plate 314. The protruding leg 540 is cylindrical in shape.
The end block 510 is used for securing the radical injector 302 to the body 312. For this purpose, the end block 510 includes screw holes 512 for receiving screws. A power line is also connected to the end block 510 to provide electric signal for generating plasma within the elongated body 520. Also, the gas or mixture for generating the radicals is injected into the radical injector 302 via the end block 510.
The cross sectional area of the end block 510 taken across plane P1 perpendicular to a longitudinal direction of the radical injector 302 is larger than the cross sectional area of the longitudinal body 520 taken along plane P2 which is also perpendicular to the longitudinal direction of the radical injector 302. Hence, the end block 510 can seal the body 312 and the elongated body 520 to prevent gas or radicals from leaking through the front part of the IMA 136.
The structure and the function of the protruding leg 640 and the end block 610 are substantially the same as the protruding leg 540 and the end block 510 except that the end block 610 is not connected to a power line, and therefore, the detailed description of the protruding leg 640 and the end block 610 is omitted herein for the sake of brevity.
The removal of radical injector 302 or the precursor injector 304 can be accomplished simply by unscrewing the screws and pulling out the radical injector 302 or the precursor injector 304 from the body 312.
The precursor injector 304 is formed with a conduit 1030 that extends along the length of the elongated body 620. The precursor gas is injected into a reaction chamber 1036 formed in the elongated body 620 from the conduit 1030 via a channel 1034.
Purge gas is injected via slit 422. The purge gas is provided to the slit 422 via a conduit 1044 and a channel 1044 between the slit 422 and the conduit 1044.
The excess radicals (or gas reverted to inert state) and part of the purge gas injected by the slit 422 is discharged via gap 1040 formed between the radical injector 302 and the body 312. Similarly, excess precursor and part of the purge gas is discharged via gap 1040 between the precursor injector 304 and the body 312. To create negative pressure, the IMA 136 may be connected to a vacuum source (not shown) to discharge the excess radicals, purge gas and the precursor.
While particular embodiments and applications have been illustrated and described, the disclosed embodiments are not limited to the precise construction and components disclosed herein. Various modifications, changes and variations, may be made in the arrangement, operation and details of the method and apparatus disclosed herein without departing from the spirit and scope defined in the appended claims.
