WO2009017322A1

WO2009017322A1 - Reactor for depositing thin film on wafer

Info

Publication number: WO2009017322A1
Application number: PCT/KR2008/004301
Authority: WO
Inventors: Chang-Hee Han; Ho-Young Lee; Sang-Jun Park; Jin-Pil Heo; Chul-Hyun An; Jung-Hwan Lee
Original assignee: Ips Ltd.
Priority date: 2007-07-30
Filing date: 2008-07-23
Publication date: 2009-02-05
Also published as: TW200913029A; CN101755073A; TWI496199B; CN101755073B

Abstract

Provided is an apparatus for depositing a thin film. A substrate support unit is rotatably installed inside the reactor and provided with a plurality of substrate loading parts on which a plurality of substrate are respectively loaded. A gas injection unit includes a plurality of source gas injectors supplying at least two different source gases onto the substrate support unit and a plurality of purge gas injectors disposed between the plurality of source gas injectors to supply a purge gas purging the source gases onto the substrate support unit, the plurality of source gas injectors and the plurality of purge gas injectors being radially installed on the substrate support unit. An exhaust unit is provided in a ring shape to surround an outer circumference of the substrate support unit and includes an exhaust channel having a plurality of exhaust ports guiding and exhausting the at least two source gases to the outside of the reactor and a plurality of partition plates installed in the exhaust channel and partitioning the exhaust channel into a plurality of exhaust passages isolated from each other such that the at least two source gases supplied through the plurality of source gas injectors are exhausted to the outside through different paths.

Description

REACTOR FOR DEPOSITING THIN FILM ON WAFER

Technical Field

[1] The present disclosure relates to an apparatus for depositing a thin film on a wafer, and more particularly, to an apparatus for depositing a thin film on a wafer that can decrease contamination inside a reactor. Background Art

[2] As the scale of semiconductor devices shrinks, requirements on an ultra thin film are increasing. Also, as the size of contact holes decreases, problems related with the step coverage become serious. As a new deposition technique capable of overcoming these problems, an atomic layer deposition (ALD) method is on the rise. In general, the ALD method is a thin film forming method in which a thin film is formed by a surface saturation of source gases, where the respective source gases are supplied separately. To stably maintain the ALD, a first source gas and a second source gas should be separately supplied into a reactor such that they are not mixed in a deposition space above a substrate.

[3] US patent No. 5,730,802 discloses a thin film depositing apparatus and method in which a reactor is separated by partition plates, a first material gas, a second material gas, and a separation gas are supplied from gas injection units into spaces of the reactor separated by the partition plates through gas supply inlets, and an atomic layer is formed while a substrate holder rotates.

[4] The construction of the thin film depositing apparatus disclosed in the above US

Patent is shown in FIG 1.

[5] Referring to FIG 1, the thin film depositing apparatus 1 includes a reactor 10, a substrate holder 20 provided rotatable in the thin film depositing 10, material gas supply inlets 30 and 40, a separation gas supply inlet 50, and a partition plate 60 for preventing material gases from being mixed. While material gases and a separation gas are respectively supplied onto a substrate W through the material gas supply inlets 30 and 40 and the separation gas supply inlet 50 at time intervals by rotation of the substrate holder 20, atomic layer deposition is performed.

[6] However, the thin film depositing apparatus 1 can prevent the material gases from being mixed over the substrate W by the partition plate 60 and the purge gas, but unreacted material gases may be mixed in the reactor 10 during an exhaust operation. If the unreacted material gases are mixed in the reactor 10 during an exhaust operation, unwanted by-products may be generated. Since the generated by-products are typically a solid phase, they may contaminate an inside of the reactor 10.

[7] Also, when a pump erroneously operates or stops operation, these by-products may flow backward into the ractor or may cause a malfijcntion. Also, if these by-products are seriously piled in an exhaust path, there may be caused a problem in that the exhaust path is blocked. In the case where such a problem is generated, the pump should be disassembled to remove the by-products or should be exchanged. Also, it may be necessary to exchange the exhaust path or to remove the by-products on the exhaust path. For this maintenance, much effort and time are necessary, which acts as a hindrance factor against mass production of semiconductor devices.

[8] Furthermore, the by-products show a substantially low flow rate on the exhaust path after the pump. That is, while these unreacted by-products move from the pump to a scrubber, they are under the environment of atmospheric pressure and room temperature, so that explosion may be generated in the scrubber or the like according to types of material gases. Thus, the by-products may cause a difficulty in managing the exhaust path. Disclosure of Invention Technical Problem

[9] The present disclosure provides an apparatus for depositing a thin film on a wafer that can prevent source gases from being mixed inside a reactor. Technical Solution

[10] According to an exemplary embodiment, an apparatus for depositing a thin film include: a reactor; a substrate support unit rotatably installed inside the reactor and provided with a plurality of substrate loading parts on which a plurality of substrate are respectively loaded; a gas injection unit including a plurality of source gas injectors supplying at least two different source gases onto the substrate support unit and a plurality of purge gas injectors disposed between the plurality of source gas injectors to supply a purge gas purging the source gases onto the substrate support unit, the plurality of source gas injectors and the plurality of purge gas injectors being radially installed on the substrate support unit; and an exhaust unit provided in a ring shape to surround an outer circumference of the substrate support unit and including: an exhaust channel having a plurality of exhaust ports guiding and exhausting the at least two source gases to the outside of the reactor; and a plurality of partition plates installed in the exhaust channel and partitioning the exhaust channel into a plurality of exhaust passages isolated from each other such that the at least two source gases supplied through the plurality of source gas injectors are exhausted to the outside through different paths.

[11] According to another exemplary embodiment, an apparatus for depositing a thin film includes: a reactor; a substrate support unit rotatably installed inside the reactor and provided with a plurality of substrate loading parts on which a plurality of substrate are respectively loaded; a gas injection unit including a plurality of source gas injectors supplying at least two different source gases onto the substrate support unit and a plurality of purge gas injectors disposed between the plurality of source gas injectors to supply a purge gas purging the source gases onto the substrate support unit, the plurality of source gas injectors and the plurality of purge gas injectors being radially installed on the substrate support unit; and an exhaust unit provided in a ring shape to surround an outer circumference of the substrate support unit and including: an exhaust channel configured to guide and exhaust the at least two source gases to the outside of the reactor; and a plurality of exhaust ports exhausting the at least two source gases, wherein at least one of the plurality of exhaust ports are disposed adjacent to each of the plurality of source gas injectors.

[12] According to still another exemplary embodiment, an apparatus for depositing a thin film includes: a plurality of process chambers each including i) a reactor; ii) a substrate support unit rotatably installed inside the reactor and provided with a plurality of substrate loading parts on which a plurality of substrate are respectively loaded; iii) a gas injection unit including a plurality of source gas injectors supplying at least two different source gases onto the substrate support unit and a plurality of purge gas injectors disposed between the plurality of source gas injectors to supply a purge gas purging the source gases onto the substrate support unit, the plurality of source gas injectors and the plurality of purge gas injectors being radially installed on the substrate support unit; iv) an exhaust unit provided in a ring shape to surround an outer circumference of the substrate support unit and including: an exhaust channel having a plurality of exhaust ports guiding and exhausting the at least two source gases to the outside of the reactor; and a plurality of partition plates installed in the exhaust channel and partitioning the exhaust channel into a plurality of exhaust passages isolated from each other such that the at least two source gases supplied through the plurality of source gas injectors are exhausted to the outside through different paths; and a plurality of pumps configured to exhaust the gases in the plurality of process chambers to the outside, wherein each of the plurality of pumps is connected with at least one of the plurality of exhaust passages of each of the plurality of process chambers, exhausting the same kind of gas.

[13] According to a farther another exemplary embodiment, an apparatus for depositing a thin film includes: a plurality of process chambers each including: i) a reactor; ii) a substrate support unit rotatably installed inside the reactor and provided with a plurality of substrate loading parts on which a plurality of substrate are respectively loaded; iii) a gas injection unit including a plurality of source gas injectors supplying at least two different source gases onto the substrate support unit and a plurality of purge gas injectors disposed between the plurality of source gas injectors to supply a purge gas purging the source gases onto the substrate support unit, the plurality of source gas injectors and the plurality of purge gas injectors being radially installed on the substrate support unit; and iv) an exhaust unit provided in a ring shape to surround an outer circumference of the substrate support unit and including: an exhaust channel configured to guide and exhaust the at least two source gases to the outside of the reactor; and a plurality of exhaust ports exhausting the at least two source gases; and a plurality of pumps configured to exhaust the gases in the plurality of process chambers to the outside, wherein at least one of the plurality of exhaust ports are disposed adjacent to each of the plurality of source gas injectors such that the source gases supplied through the respective source gas injectors are exhausted to the outside through different exhaust ports, and each of the plurality of pumps is connected with at least one of the plurality of exhaust ports of each of the plurality of process chambers, exhausting the same kind of gas.

Advantageous Effects

[14] According to an exemplary embodiment, an exhaust unit having an isolated exhaust passage is used to effectively prevent source gases from being mixed inside a reactor, so that contamination of the apparatus for depositing a thin film decreases.

[15] According to another exemplary embodiment, exhaust ports are formed adjacent to the respective source gas injectors to effectively prevent source gases from being mixed inside a reactor, so that contamination of the apparatus for depositing a thin film decreases.

[16] Resultantly, exhaust lines and pumps are provided in numbers equal to the number of source gases to prevent the source gases from being mixed in the exhaust lines as well as inside the reactor, so that efforts and costs necessary for managing the exhaust path can be saved.

[17] Also, in the case where the same source gas is used in two or more process c hambers, the same source gas can be exhausted by a single pump, so that costs can be saved.

Brief Description of the Drawings

[18] FIG 1 is a schematic view of a thin film depositing apparatus for an ALD according to a related art; [19] FIG 2 is a schematic view of an apparatus for depositing a thin film according to an exemplary embodiment; [20] FIG 3 is a sectional view taken along line III- III of FIG 2 and illustrates a substrate support unit and a baffle of an apparatus for depositing a thin film according to an exemplary embodiment; [21] FIG 4 is a sectional view taken along line IV-IV of FIG 2 and illustrates a gas injection unit of an apparatus for depositing a thin film according to an exemplary embodiment; [22] FIG 5 is a partial cut-away perspective view illustrating a schematic structure of the exhaust unit for the apparatus for depositing a thin film according to an exemplary embodiment; [23] FIG 6 is a sectional view taken along line VI-VI of FIG 2 and illustrates a schematic structure of the exhaust unit for the apparatus for depositing a thin film according to an exemplary embodiment; [24] FIG 7 is a perspective view illustrating a schematic structure of the exhaust unit for the apparatus for depositing a thin film according to an exemplary embodiment; [25] FIG 8 is a sectional view taken alone line VIII-VIII of FIG 7 and illustrates a schematic structure of the exhaust unit for the apparatus for depositing a thin film according to an exemplary embodiment; [26] FIG 9 is a sectional view illustrating an apparatus for depositing a thin film according to another exemplary embodiment; [27] FIG 10 is a partial cut-away perspective view illustrating a schematic structure of the exhaust unit for the apparatus for depositing a thin film according to another exemplary embodiment; [28] FIG 11 is a section view taken along line XI-XI of FIG 9 and illustrates a schematic structure of the exhaust unit for the apparatus for depositing a thin film according to another exemplary embodiment; [29] FIG 12 is a perspective view illustrating a schematic structure of the exhaust unit for the apparatus for depositing a thin film according to another exemplary embodiment; [30] FIG 13 is a sectional view taken along line XIII-XIII and illustrates a schematic structure of the exhaust unit for the apparatus for depositing a thin film according to another exemplary embodiment;

[31] FIG 14 is a sectional view illustrating an apparatus for depositing a thin film according to a further another embodiment; and

[32] FIG 15 is a schematic view illustrating an exhaust line structures for the apparatus for depositing a thin film according to a further another exemplary embodiment. Best Mode for Carrying Out the Invention

[33] The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. The invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art.

[34] FIG 2 is a schematic view of an apparatus for depositing a thin film according to an embodiment of the present invention, FIG 3 is a sectional view taken along line III-III of FIG 2, and FIG 4 is a sectional view taken along line IV-IV of FIG 2.

[35] Referring to FIGS. 2 to 4, the apparatus 100 for depositing a thin film according to an exemplary embodiment includes a reactor 200, a substrate support unit 210, a gas injection unit 220, an exhaust unit 230, two pumps 240a, 240b and two scrubbers 250a, 250b.

[36] The reactor 200 includes a bottom 201, an outer wall 202, and an upper plate 203.

The bottom 201 has a circular plate shape, and the outer wall 202 is shaped as a cylinder, which extends vertically upward from the perimeter of the bottom 201. The outer wall 202 has a loading passage (not shown) through which a substrate W is loaded or unloaded. The upper plate 203 has a circular plate shape, and is detachably coupled to an upper end of the outer wall 202. When the upper plate 203 is coupled to the upper end of the outer wall 202, a space is formed in the reactor 200. Particularly, a thin film deposition space 205 is formed above the substrate support unit 210, which will be described below, between the substrate support unit 210 and the gas injection unit 220. A sealing member (not shown), such as an O-ring, is interposed between a bottom surface of the upper plate 203 and the upper end of the outer wall 202 to seal the space defined in the reactor 200.

[37] The substrate support unit 210 is provided in the reactor 200, and includes a susceptor 212, a plurality of substrate loading parts 213, a shaft 211, and a heater (not shown). [38] The susceptor 212 is formed as a circular plate and is rotatably disposed in the reactor 200. The substrate loading part 213 formed in the susceptor 212 is provided in sextuplicate. As shown in FIG 3, the substrate loading parts 213 are arranged circum- ferentially on the substrate support unit 210, and substrates W are loaded on the respective substrate loading parts 213.

[39] One end of the shaft 211 is coupled to a bottom surface of the susceptor 212, and the other end of the shaft 211 penetrates the reactor 200 and is connected to a rotation driving means such as a motor (not shown). Accordingly, as the shaft 211 rotates, the susceptor 212 rotates about a rotation center axis A represented by the broken line in FIG 2. Also, the shaft 211 is connected to an ascending and descending driving means that can elevate and lower the susceptor 212. The ascending and descending driving means may include, for example, a motor, a gear assembly (not shown) or the like. The heater (not shown) is buried below the susceptor 212 to control the temperature of the substrate W.

[40] The gas injection unit 220 is coupled to the upper plate 203 provided over the substrate support unit 210, and includes gas injectors 270a, 270b and 270c. The gas injectors 270a, 270b and 270c may be classified into a first source gas injector 270a, a second source gas injector 270b, and a purge gas injector 270c, according to the types of supply gases. The first source gas injector 270a supplies a first source gas, such as silane (SiH ), onto the substrate support unit 210, and the second source gas injector 270b supplies a second source gas, such as oxygen (O ), onto the substrate support unit

2

210. The purge gas injector 270c supplies a purge gas for purging the first source gas and the second source gas onto the substrate support unit 210. That is, the first source gas injector 270a and the second source gas injector 270b are apparatus for injecting source gases to deposit a thin film on the substrate W. Also, the purge gas injector 270c is a unit for injecting the purge gas to purge unreacted source gases remaining in the thin film deposition space 205, thereby preventing them from being mixed over the substrate support unit 210. The gas injectors 270a, 270b and 270c each may be made in the shape of a shower head.

[41] As shown in FIG 4, the first source gas injector 270a, the second source gas injector

270b and the purge gas injector 270c are disposed radially and circumferentially on the gas injection unit 220. Among the ten gas injectors 270a, 270b and 270c shown in FIG 4, the first source gas injector 270a for injecting the first source gas and the second source gas injector 270b for injecting the second source gas are disposed at opposite sides to prevent the first and second source gases from being mixed with each other. In addition, between the first and second source gas injectors 270a and 270b, four adjacent purge gas injectors 270c and the other four adjacent purge gas injectors 270c are respectively disposed at opposite sides, to prevent the first and second source gases from being mixed with each other. According to the amount of the supply source gas, some of the purge gas injectors 270c may not be used.

[42] Herein, the purge gas is supplied to prevent the different source gases supplied through the gas injection unit 220 from being mixed over the substrate W. However, the purge gas injectors 270c disposed between the first and second source gas injectors 270a and 270b are difficult to prevent the first source gas and the second source gas from being mixed with each other at the central portion of the substrate support unit 210. Therefore, as shown in FIGS. 2 and 4, a central purge gas injector 260 for supplying a purge gas (for purging the first source gas and the second source gas) onto the substrate support unit 210 is installed at a central portion of the gas injection unit 220. The purge gas supplied by the central purge gas injector 260 prevents the first source gas and the second source gas from being mixed at the central portion of the substrate support unit 210. The central purge gas injector 260 also may be made in the shape of a shower head.

[43] As the substrate support unit 210 on which the substrate W is loaded below the above-configured gas injection unit 220 rotates, the first source gas, the purge gas and the second source gas are periodically supplied onto the substrate W to allow the atomic layer deposition.

[44] The source gas may be changed into plasma to be supplied through the gas injection unit 220. Here, plasma may be generated in a plasma generator (not shown) installed outside the reactor 200. Plasma may also be generated inside the gas injection unit 220 before being supplied onto the substrate support unit 210.

[45] FIG 5 is a partial cut-away perspective view illustrating a schematic structure of the exhaust unit 230 for the apparatus for depositing a thin film according to an exemplary embodiment, and FIG 6 is a sectional view taken along line VI-VI of FIG 2. In FIG 6, in order to clearly describe the arrangement of the exhaust unit 230 and the gas injection unit 220, gas inlets 236a and 236) of a baffle 231 and the gas injection unit 230 are shown by dotted lines together with the partition plates 235 and the exhaust ports 238a and 238b.

[46] The exhaust unit 230 is configured to exhaust the gas remaining in the reactor 200.

Referring to FIGS. 2, 5 and 6, the exhaust unit 230 includes exhaust channel 237, a partition plate 235 and a baffle 231. [47] The exhaust channel 237 is defined by the outer wall portion 202, an inner wall 233 and the bottom portion 201. Specifically, the outer wall portion 202 indicates an inner surface of an outer wall of the reactor 200, and has a ring shape.

[48] In the present exemplary embodiment, the bottom portion 201 indicates a bottom surface of the reactor 200. The bottom portion 201 is an integral structure having a circular plate shape, and is divided by the inner wall 233 into two regions, i.e., a lower wheel region 239 outside the inner wall 233 and a central region 232 inside the inner wall 233. The lower wheel region 239 indicates a region horizontally protruding from the outer wall portion 202 to have a ring shape, and the central region 232 indicates a region extending from the lower wheel region 239 At the center of the central region 232, a through hole 234 is formed to allow the shaft 211 to penetrate therethrough. Also, two exhaust ports 238a and 238b are formed through the lower wheel region 239 symmetrically at opposite sides.

[49] The inner wall 233 extends vertically upward from the lower wheel region 239, and is spaced apart by a predetermined distance from the outer wall portion 202 between the substrate support unit 210 and the outer wall portion 202 to have a ring shape. Upper surfaces of the outer wall portion 202 and the inner wall 233 include stepped portions to receive the baffle 231, which will be described below.

[50] The partition plate 235 is provided between the outer wall portion 202 and the inner wall 233 to separate an exhaust channel 237 to two separate exhaust channels 237a and 237b. That is, the two partition plates 235 are disposed at opposite sides in the exhaust channel 237. In the embodiment, the first and second source gas injectors 270a and 270b are disposed at opposite sides with respect to a center of the gas injection unit 220. The partition plates 235 are disposed at a lower side of the periphery of the purge gas injectors 270c away from the first and second source gas injectors 270a and 270b. More preferably, the partition plates 235 are disposed substantially perpendicular to an imaginary line passing through the centers of the first and second source gas injectors 270a and 270b, and disposed under the plane of the gas injection unit 220, as shown in FIG 6 The exhaust ports 238a and 238b are disposed on respective sections of the lower wheel region 239 separated by the partition plates 235. More preferably, one exhaust port 238a is disposed at a lower side of the periphery of the first source gas injector 270a, and the other exhaust port 238b is disposed at a lower side of the periphery of the second source gas injector 270b, as shown in FIG 6 Then, because the first source gas and the second source gas are introduced into the respective exhaust channels 237a and 237b, and the exhaust channels 237a and 237b are separated by the partition plates 235, the first and second source gases are not mixed with each other.

[51] The baffle 231 is a ring-shaped plate and is placed on the stepped portions on the upper surfaces of the outer wall portion 202 and the inner wall portion 233 to cover open upper surfaces of the exhaust channels 237a and 237b. A plurality of gas inlets 236a and 236) separated by predetermined distances are disposed through the baffle 231 so that a gas is introduced into the exhaust channels 237a and 237b. As such, it is possible to control an exhaust flow rate and thus an inner pressure of the reactor 200 by controlling the size and the number of the gas inlets 236a and 236) in the baffle 231. Because the gases are pumped through the exhaust ports 238a and 238b by pumps 240a and 240b, which will be described below, and the injection of the purge gas prevents the source gas from being diffused, the first source gas supplied through the first source gas injector 270a is introduced into the exhaust channel 237a through the gas inlet 236a adjacent to the first source gas injector 270a. Similarly, the second source gas is introduced into the exhaust channel 237b through the gas inlet 236) adjacent to the second source gas injector 270b.

[52] The above-configured exhaust unit 230 provides two separate flow passages. That is, the exhaust unit 230 provides a first exhaust passage and a second exhaust passage separated by the partition plates 235. The first exhaust passage is formed through the gas inlets 236a in the baffle 231 disposed on one side of the partition plate 235, and the exhaust channel 237a and the exhaust port 238a under the gas inlets 236a. Similarly, the second exhaust passage is formed through the gas inlets 236) in the baffle 231 disposed on the other side of the partition plate 235, and the exhaust channel 237b and the exhaust port 238b under the gas inlets 236).

[53] Referring back to FIG 2, the two pumps 240a and 240b are configured to exhaust unreacted gas out of the reactor 200. The first pump 240a is connected to the first exhaust passage, and the second pump 240b is connected to the second exhaust passage. As the first and second pumps 240a and 240b are connected as described above, it is possible to remove the possibility that the first and second source gas are mixed with each other outside the reactor 200 as well as in the reactor 200. Both the first source gas and the second source gas are exhausted out of the reactor 200 by only one pump. Even in this case, the first source gas and the second source gas are not mixed with each other in the reactor 200.

[54] The two scrubbers 250a and 250b are disposed after the pumps 240a and 240b on the exhaust path to filter the exhaust gas. The first scrubber 250a is disposed after the first pump 240a on the exhaust path of the first source gas to filter the first source gas, and the second scrubber 250b is disposed after the second pump 240b on the exhaust path of the second source gas to filter the second source gas. As the different pumps 240a and 240b are connected to the different scrubbers 250a and 250b, the possibility that the first and second source gases are mixed with each other is removed throughout the whole exhaust passage. As such, it is possible to reduce the efforts and cost for controlling the exhaust path.

[55] Hereinafter, the exhaust process of the apparatus for depositing a thin film according to the embodiment will be described. For convenience of description, the gas inlet, the exhaust channel, and the exhaust port constituting the first exhaust passage are referred to as a first gas inlet 236a, a first exhaust channel 237a, and a first exhaust port 238a, respectively. Similarly, the gas inlet, the exhaust channel, and the exhaust port constituting the second exhaust passage are referred to as a second gas inlet 23ft), a second exhaust channel 237b, and a second exhaust port 238b, respectively. The first gas inlet 236a is disposed under the first gas injector 270a, and the second gas inlet 23ft) is disposed under the second gas injector 270b.

[55] The first source gas is supplied through the first gas injector 270a, and the second source gas is supplied through the second gas injector 270b. Also, the purge gas is supplied through the purge gas injector 270c and the central purge gas injector 260. Because the first source gas, the second source gas, and the purge gas are supplied as described above and the substrate support unit 210 rotates at the same time, the first source gas and the second source gas are periodically supplied onto the substrate W to deposit the thin film.

[57] A portion of the first source gas that did not participate in the thin film deposition is exhausted through the first exhaust passage. That is, the first source gas is introduced into the first exhaust channel 237a through the first gas inlet 236a disposed under the first source gas injector 270a, and then exhausted out of the reactor 200 through the first exhaust port 238a. The first pump 240a is connected to the first exhaust port 238a to facilitate exhausting of the first source gas. The first source gas exhausted out of the reactor 200 is filtered by the first scrubber 250a. Similarly, a portion of the second source gas that did not participate in the thin film deposition is exhausted through the second exhaust passage. That is, the second source gas is introduced into the second exhaust channel 237b through the second gas inlet 23ft) disposed under the second source gas injector 270b, and then exhausted out of the reactor 200 through the second exhaust port 238b. The second pump 240b is connected to the second exhaust port 238b to facilitate exhusting of the second source gas. The second source gas exhausted out of the reactor 200 is filtered by the second scrubber 250b.

[58] The purge gas can be exhausted through any of the first exhaust passage and the second exhaust passage. In more detail, the purge gas supplied through two sets of two purge injection units 270c adjacent to the first source gas injector 270a is exhausted through the first exhaust passage, and the purge gas supplied through two sets of two purge injection units 270c adjacent to the second source gas injector 270b is exhausted through the second exhaust passage. As such, the first source gas and the second source gas are not mixed with each other in the reactor 200. Further, they are not mixed in the exhaust line outside the reactor, such as the pump and the scrubber. Furthermore, they are not mixed over the central portion of the substrate support unit 210 because the purge gas is also supplied through the central purge gas injector 260.

[59] Although the bottom portion of the exhaust unit has been described to be in a plane of the bottom surface of the reactor, it is not limited thereto. For example, the bottom portion of the exhaust unit may also be in a plane higher than the bottom surface of the reactor, and it may also be protruded from the outer wall portion to be disposed in a ring shape. In addition, although the partition plate has been described to be integrally formed with the reactor, it is not limited thereto. For example, the partition plate may also extend downwards from a bottom of the baffle. It is difficult to control the number of the partition plates when the partition plates are integrally formed with the reactor. However, when the partition plates are integrally formed with the baffle, instead of the reactor, the number of the partition plates can be easily controlled according to the kind and the properties of the source gas. Furthermore, although the exhaust port has been described to be formed in the bottom portion of the exhaust unit, it is not limited thereto. For example, the exhaust port may also be formed to penetrate through the outer wall of the reactor, i.e., through the inner surface and the outer surface of the outer wall.

[60] Although the exhaust unit 230 other than the baffle 231 has been described to be integrally formed with the reactor, it may also be formed as a separate element to be coupled to the reactor 200, as shown in FIGS. 7 and 8.

[61] FIG 7 is a perspective view illustrating a schematic structure of an exhaust unit 230 for the apparatus for depositing a thin film according to another exemplary embodiment, and FIG 8 is a sectional view taken alone line VIII-VIII of FIG 7.

[62] Referring to FIGS. 7 and 8, the exhaust unit 230 includes a baffle 231, an inner circumferential part 310, an outer circumferential part 320, a bottom part 330, and two partition plates 235. The exhaust unit 230 is disposed between an outer surface of the substrate support unit 210 and an inner surface of the outer wall 202 of the reactor 200. The outer circumferential part 320 is coupled with the inner surface of the outer wall 202 of the reactor 200 and the inner circumferential part 310 is coupled with the outer surface of the substrate support unit 210. Descriptions for the inner circumferential part 310, the outer circumferential part 320, and the bottom part 330 are identical to those of FIGS. 5 and 6 except that the inner wall 233, the outer wall portion 202, and the bottom portion 201 are integrally formed with the reactor 200. Like reference numerals refer to like elements throughout FIGS. 5 and 6 and FIGS. 7 and 8.

[63] FIG 9 is a sectional view illustrating a schematic structure of an apparatus for depositing a thin film according to another exemplary embodiment.

[64] Referring to FIG 9, the apparatus 110 for depositing a thin film according to another exemplary embodiment includes a reactor 400, a substrate support unit 410, a gas injection unit 420, an exhaust unit 430, two pumps 440a and 440b, and two scrubbers 450a and 450b.

[65] The reactor 400, the substrate support unit 410, and the gas injection unit 420 of the apparatus for depositing a thin film according to the exemplary embodiment of FIG 9 correspond to the reactor 200, the substrate support unit 210, and the gas injection unit 220 of the apparatus for depositing a thin film according to the exemplary embodiment of FIG 1, respectively.

[66] FIG 10 is a partial cut-away perspective view illustrating a schematic structure of an exhaust unit 430 for the apparatus for depositing a thin film according to another exemplary embodiment, and FIG 11 is a section view taken along line XI-XI of FIG 9 To clarify an arrangement relation of the exhaust unit 430 and the gas injection unit 420, gas inlets 436a and 436) of the gas injection unit 420 and the baffle 431 are shown by dotted lines together with the exhaust ports 438a and 438b.

[67] The exhaust unit 430 is configured to exhaust the remaining gas in the reactor 400 and includes an exhaust channel 437 and a baffle 431, referring to FIGS. 9, 10, and 11.

[68] The exhaust channel 437 is surrounded by an outer wall portion 402, an inner wall

433, and a bottom portion 401. In more detail, the outer wall portion 402 indicates an inner surface of the outer wall of the reactor 400 and has a ring shape.

[69] In the present exemplary embodiment, the bottom portion 401 indicates a bottom surface of the reactor 400, and is an integral type and a circular plate shape. The bottom portion 401 may be divided by the inner wall 433 into two regions, i.e., a lower wheel region 439 outside the inner wall 433 and a central region 432 inside the inner wall 433. The lower wheel region 439 indicates a region horizontally protruding from the outer wall portion 402 to have a ring shape, and the central region 432 indicates a region extending from the lower wheel region 439 At the center of the central region 432, a through hole 434 is formed to allow the shaft 411 to penetrate therethrough. Also, two exhaust ports 438a and 438b are formed in the lower wheel region 439 to penetrate the top surface and the bottom surface thereof.

[70] The exhaust ports 438a and 438b are disposed adjacent to the respective source gas injectors 470a and 470b such that source gases supplied to the respective source gas injectors 470a and 470b are exhausted to the outside of the reactor 400 through the exhaust ports 438a and 438b adjacent to the source gas injectors 470a and 470b. The source gas injectors 470a and 470b in the apparatus for depositing a thin film according to the present exemplary embodiment are disposed at opposite sides with respect to a center of the gas injection unit 420, like the source gas injectors 270a and 270b in the apparatus 100 for depositing a thin film according to the exemplary embodiment of FIG 2. As shown in FIG 11, one of the exhaust ports 438a and 438b, for example, the exhaust port 438a is disposed under the first gas injector 470a, and the other one, for example, the exhaust port 438b is disposed under the second gas injector 470b.

[71] If the exhaust unit 430 is configured like above, a first source gas supplied through the first gas injector 470a is introduced into the exhaust channel 437, and then is exhausted to the outside of the reactor 400 through the exhaust port 438a disposed adjacent to the first gas injector 470a. A second source gas supplied through the second gas injector 470b is introduced into the exhaust channel 437, and then is exhaust to the outside of the reactor 400 through the exhaust port 438b disposed adjacent to the second gas injector 470b. At this point, since the exhaust ports 438a and 438b are pumped by pumps 440a and 440b, which will be described later, the first source gas is not exhausted through the exhaust port 438b disposed opposite to the exhaust port 438a adjacent to the first gas injector 470a. Likewise, the second source gas is not exhausted through the exhaust port 438a disposed opposite to the exhaust port 438b adjacent to the second gas injector 470b. Accordingly, the first source gas and the second source gas are respectively exhausted through the different paths such that they are not mixed in the reactor 400.

[72] Even if a purge gas supplied through a purge gas injector 470c is mixed with a source gas, it does not react. Thus, it doesn t matter which one of exhaust ports 438a and 438b is used for exhaust. [73] The inner wall 433 vertically extends upward from the low wheel region 439 and is disposed with a ring shape between the substrate support unit 410 and the outer wall portion 402 to be spaced apart by a predetermined distance from the outer wall portion 402. The upper surfaces of the outer wall portion 402 and the inner wall 433 have respective stepped portions to which a baffle 431 can be installed.

[74] The baffle 431 having a ring plate shape is installed on the stepped portions of the outer wall portion 402 and the inner wall 433 in order to cover an open upper surface of the exhaust channel 437. The baffle 431 has gas inlets 436a and 436) penetrating the upper surface and the lower surface thereof to allow gas to be introduced into the exhaust channel 437 at predetermined angle intervals along the upper surface of the baffle 431. When the baffle 431 is installed like above, it is possible to control exhaust flow rate by adjusting sizes and the number of the gas inlets 436a and 436) in the baffle 431.

[75] The first source gas supplied through the first gas injector 470a is introduced into the exhaust channel 437 through the gas inlets 436a formed between the first gas injector 470a and the exhaust port 438a adjacent thereto. Likewise, the second source gas supplied through the second gas injector 470b is introduced into the exhaust channel 437 through the gas inlets 436a formed between the second gas injector 470b and the exhaust port 438b adjacent thereto. At this point, because the exhaust ports 438a and 438b are pumped by pumps 440a and 440b, which will be described later, and a purge gas prevents a source gas from being diffused, the first source gas is not introduced into the exhaust channel 437 through the gas inlet 436) not the gas inlet 436a adjacent to the first gas injector 470a and opposite to the gas inlet 436). Likewise, the second source gas is not introduced into the exhaust channel 437 through the gas inlet 436a not the gas inlet 436) adjacent to the second gas injector 470b and opposite to the gas inlet 436a.

[76] Consequently, in the present exemplary embodiment, the first source gas supplied through the first gas injector 470a is exhausted through the gas inlet 436a and the exhaust port 438a adjacent to the first gas injector 470a. Likewise, the second source gas supplied through the second gas injector 470b is exhausted through the gas inlet 436) and the exhaust port 438b adjacent to the second gas injector 470b.

[77] Referring to FIG 9 again, the two pumps 440a and 440b exhaust unreacted gas in the reactor 400 to the outside of the reactor 400. The first pump 440a is installed to be connected to the exhaust port 438b adjacent to the surrounding of the second gas injector 470b, and the second pump 440b is installed to be connected to the exhaust port 438b adjacent to the surrounding of the second gas injector 470b. Moreover, the first pump 440a and the second pump 440b may be installed to provide the same suction power in order not to mix the first source gas with the second source gas in the reactor 400. If two pumps 440a and 440b are installed like above, the first source gas and the second source gas are not mixed in and outside the reactor 400. However, only one pump connected to all of the exhaust ports 438 a and 438b can be exhausted the first source gas and the second source gas introduced into the exhaust unit 430 to the outside of the reactor 400. Even if apparatus 110 for depositing a thin film has only one pump, source gases do not mix in the reactor 400.

[78] The two scrubbers 450a and 450b are installed after the pumps 440a and 440b on an exhaust path to filter the exhaust gas. The first scrubber 450a is disposed after the first pump 440a on an exhaust path of the first source gas to filter a first source gas, and the second scrubber 450b is installed after the second pump 440b on an exhaust path of the second source gas to filter the second source gas. Thus, if the scrubbers 450a and 450b are installed to correspond one-to-one with the respective pumps 440a and 440b, source gases are not mixed in all the exhaust paths, so that efforts and costs consumed for managing the exhaust path can be drastically reduced.

[79] Hereinafter, an exhaust process of the apparatus 110 for depositing a thin film having the above structure according to the present exemplary embodiment will be described. For convenience of description, the gas inlet and the exhaust port disposed adjacent to the first gas injector 470a are called a first gas inlet 436a and a first exhaust port 438a, respectively. The gas inlet and the exhaust port disposed adjacent to the second gas injector 470b are called a second gas inlet 436a and a second exhaust port 438a, respectively.

[80] The first source gas is supplied through the first gas injector 470a and the second source gas is supplied through the second gas injector 470b. The purge gas is supplied through the purge gas injector 470c and a central purge gas injector 460. Since the substrate support unit 410 rotates while the first and second source gases and the purge gas are supplied, the first and second source gases are periodically supplied on a substrate W to deposit a thin film.

[81] A portion of the first source gas that did not participate in the thin film deposition is introduced into the exhaust channel 437 through the first gas inlet 436a, and the first source gas introduced into the exhaust channel 437 is exhausted to the outside of the reactor 400 again through the first exhaust port 438a. A path through which the first source gas is exhausted to the outside of the reactor 400 is called a first exhaust passage. The first pump 440a is connected to the first exhaust port 438a to allow the first source gas to be smoothly exhausted. The first source gas exhausted to the outside of the reactor 400 is filtered by the first scrubber 450a. Likewise, a portion of the second source gas that did not participate in the thin film deposition is introduced into the exhaust channel 437 through the second gas inlet 436a, and the second source gas introduced into the exhaust channel 437 is exhausted to the outside of the reactor 400 again through the second exhaust port 438b. A path through which the second source gas is exhausted to the outside of the reactor 400 is called a second exhaust passage. The second pump 440b is connected to the second exhaust port 438b to allow the second source gas to be smoothly exhausted. The second source gas exhausted to the outside of the reactor 400 is filtered by the second scrubber 450b. At this point, it is preferable that the first pump 440a and the second pump 440b provide the same suction power such that the first source gas and the second source gas are not mixed with each other in the exhaust channel 437.

[82] Moreover, the purge gas may be exhausted through any one of the first exhaust port

438a and the second exhaust port 438b. In more detail, a purge gas supplied through two purge gas injectors 470c installed at both sides of the first gas injector 470a is exhausted through the first exhaust port 438a, and a purge gas supplied through two purge gas injectors 470c at both sides of the second gas injector 470c is exhausted through the second exhaust port 438b.

[83] By doing so, the first and second source gases are not mixed in the reactor 400, and also are not mixed in an exhaust line, such as the pumps 440a and 440b, the scrubbers 450a and 450b, etc. positioned outside the reactor 400. On the other hand, since the purge gas is supplied from the central purge gas injector 460, the source gases do not mix with the purge gas even through the central region of the substrate support unit 410, and the purge gas supplied through the central purge gas injector 460 is exhausted through both of the first exhaust port 438a and the second exhaust port 438b.

[84] While the above exemplary embodiments show and describe that the bottom portion of the exhaust unit is the same as the bottom surface of the reactor, the present invention is not limited thereto. For example, the bottom portion of the exhaust unit may be upwardly installed spaced apart from the bottom surface of the reactor, and protrude from the outer wall of the reactor to have a ring shape. Also, while the above exemplary embodiments show and describe that the exhaust port is formed in the bottom portion of the exhaust unit, the present invention is not limited thereto. For example, the exhaust port may be formed on the outer wall of the reactor to penetrate the inner surface and the outer surface of the outer wall of the reactor.

[85] As aforementioned, the exhaust unit 430 may be configured to allow the remaining parts except for the baffle 431 to be integrated with the reactor 400, but as illustrated in FIGS. 12 and 13, the exhaust unit 430 may be provided as a separate part from the reactor 400 and coupled to the reactor 400.

[86] FIG 12 is a perspective view illustrating a schematic structure of an exhaust unit 430 used in the apparatus for depositing a thin film according to another exemplary embodiment, and FIG 13 is a sectional view taken along line XIII-XIII of FIG 12.

[87] Referring to FIGS. 12 and 13, the exhaust unit 430 includes a baffle 431, an inner circumferential part 510, an outer circumferential part 520, and a bottom part 530. The exhaust unit 430 is disposed between an outer surface of the substrate support unit 410 and an inner surface of the outer wall 402 of the reactor 400. Additionally, the outer circumferential part 520 is coupled with the inner surface of the outer wall 402 of the reactor 400, and the inner circumferential part 510 is coupled with the outer surface of the substrate support unit 410. Descriptions for the inner circumferential part 510, the outer circumferential part 520, and the bottom part 530 are identical to those of FIGS. 10 and 11 except that the inner wall 433, the outer wall portion 402, and the bottom portion 401 are integrally formed with the reactor 400. Like reference numerals refer to like elements throughout FIGS. 10 and 11 and FIGS. 12 and 13.

[88] While the above exemplary the embodiments show and describe that the central purge gas injectors 260 and 460 are installed to prevent the source gases from being mixed at the central region of the substrate supporting units 210 and 410, the present invention is not limited thereto. FIG 14 is a sectional view illustrating an apparatus for depositing a thin film according to another exemplary embodiment of the present invention.

[89] As shown in FIG 14, in order to prevent the source gases at the central regions of the substrate supporting units 210 and 410, the gas injection units 220 and 420 may include a protruding portion 610 at the center thereof, which protrudes downward with respect to the bottom surface. The substrate supporting units 210 and 410 may include an insertion groove portion 620 at a position corresponding to the protruding portion 610 such that the protruding portion 610 of the gas injection units 220 and 420 is received in the substrate supporting units 210 and 410. In this structure, there should be some space between outer sidewall surfaces of the protruding portion 610 and the insertion groove portion 620 of the substrate supporting units 210 and 410 such that the protruding portion 610 inserted into the insertion groove portion 620 does not influence the gas injection units 220, 420 while the substrate supporting units 210 and 410 rotate. Thus, the protruding portion 610 of the gas injection units 220 and 420 physically prevents the source gases from being mixed at the central region of the substrate supporting units 210 and 410. In this case, the plurality of gas injectors 270 and 470 are disposed radially centering on the protruding portion 610, and the plurality of substrate loading parts 213 and 413 are disposed radially centering on the insertion groove portion 620. Description related to the like reference numerals in FIGS. 2, 9, and 14 will be omitted for conciseness.

[90] Also, on the contrary, when the insertion groove portion is formed in the gas injection units 220 and 420 and the protruding portion is formed on the substrate supporting units 210 and 410, the same effect can be expected.

[91] FIG 15 is a view illustrating a schematic construction of an exhaust line for an apparatus for depositing a thin film according to another exemplary embodiment.

[92] Referring to FIG 15, the apparatus for depositing a thin film according to another exemplary embodiment includes a plurality of process chambers 800, a first pump 840a, and a second pump 840b.

[93] The process chamber 800 includes a reactor, a substrate support unit, a gas injection unit and an exhaust unit. The reactor, the substrate support unit and the gas injection unit of the process chamber 800 of FIG 15 have the same important structure and effects as those of FIGS. 2 and 9 The exhaust unit of the process chamber 800 of FIG 15 is any one of the exhaust unit 230 of FIG 2 and the exhaust unit 430 of FIG 9

[94] To exhaust the first source gas supplied to each of the process chambers 800 to the outside of the reactor, the first pump 840a is installed to be connected to a first exhaust passage 810 of each of the process chambers 800. To exhaust the second source gas supplied to each of the process chambers 800 to the outside of the reactor, the second pump 840b is installed to be connected to the second exhaust passage 820 of each of the process chambers 800. That is, the pump and the scrubber can be commonly used for exhaust of the same kinds of source gases, so that maintenance costs can be saved.

[95] While the exemplary embodiments show and describe apparatuses for depositing a thin film in which two kinds of source gases are supplied and a thin film depositing process is performed, the present invention is not limited thereto. For example, when more than three kinds of source gases are supplied and a thin film depositing process is performed, similar effects can be obtained. However, to inject more than three kinds of source gases, the gas injection units 220 and 420 should further include an additional source gas injector besides the first gas injectors 270a and 470a and the second gas injectors 270b and 470b and also further include an additional purge gas injector between the source gas injectors.

[96] The exhaust unit 230 in the apparatus for depositing a thin film according to the exemplary embodiment should be provided with separate independent exhaust passages having the number equal to the number of source gases in order to exhaust the respective source gases. For this, the exhaust unit 230 is required to include an additional partition plate. The exhaust unit 430 in the apparatus for depositing a thin film according to another exemplary embodiment should be provided with an additional source gas injector and an additional exhaust port, which should be formed adjacent to the source gas injector. Furthermore, in order to prevent source gases from being mixed on an exhaust line, additional pumps and scrubbers each having the number equal to the number of source gases should be further provided. When more than four kinds of source gases are supplied, the above-mentioned components should be additionally provided.

[97] Although apparatuses for depositing a thin film on a wafer have been described with reference to the specific embodiments, it is not limited thereto. Therefore, it will be readily understood by those skilled in the art that various modifications and changes can be made thereto without departing from the spirit and scope of the present invention defined by the appended claims.

Claims

[1] An apparatus for depositing a thin film comprising: a reactor; a substrate support unit rotatably installed inside the reactor and provided with a plurality of substrate loading parts on which a plurality of substrate are respectively loaded; a gas injection unit including a plurality of source gas injectors supplying at least two different source gases onto the substrate support unit and a plurality of purge gas injectors disposed between the plurality of source gas injectors to supply a purge gas purging the source gases onto the substrate support unit, the plurality of source gas injectors and the plurality of purge gas injectors being radially installed on the substrate support unit; and an exhaust unit provided in a ring shape to surround an outer circumference of the substrate support unit and including: an exhaust channel having a plurality of exhaust ports guiding and exhausting the at least two source gases to the outside of the reactor; and a plurality of partition plates installed in the exhaust channel and partitioning the exhaust channel into a plurality of exhaust passages isolated from each other such that the at least two source gases supplied through the plurality of source gas injectors are exhausted to the outside through different paths.

[2] The apparatus of claim 1, wherein the exhaust channel is surrounded and formed by an outer wall of the reactor, a ring-shaped bottom extending from the outer wall of the reactor toward the substrate support unit, and a ring-shaped inner wall disposed between the substrate support unit and the outer wall of the reactor, extending upward from the ring-shaped bottom, and spaced apart by a predetermined distance from the outer wall of the reactor

[3] The apparatus of claim 2, wherein the partition plate is integrally formed with the outer wall, the inner wall and the bottom.

[4] The apparatus of claim 1 or 2, wherein the exhaust unit further comprises a ring- shaped plate baffle installed to cover an open upper surface of the exhaust channel and having a plurality of gas inlets penetrating an upper surface and a lower surface thereof such that the at least two source gases can be introduced into the exhaust channel.

[5] The apparatus of claim 4, wherein the partition plate is integrally formed with the baffle.

[6] The apparatus of claim 1 or 2, further comprising a plurality of pumps connected with the respective exhaust passages to exhaust the gases introduced into the respective exhaust passages to the outside of the reactor.

[7] An apparatus for depositing a thin film comprising: a reactor; a substrate support unit rotatably installed inside the reactor and provided with a plurality of substrate loading parts on which a plurality of substrate are respectively loaded; a gas injection unit including a plurality of source gas injectors supplying at least two different source gases onto the substrate support unit and a plurality of purge gas injectors disposed between the plurality of source gas injectors to supply a purge gas purging the source gases onto the substrate support unit, the plurality of source gas injectors and the plurality of purge gas injectors being radially installed on the substrate support unit; and an exhaust unit provided in a ring shape to surround an outer circumference of the substrate support unit and including: an exhaust channel configured to guide and exhaust the at least two source gases to the outside of the reactor; and a plurality of exhaust ports exhausting the at least two source gases, wherein at least one of the plurality of exhaust ports are disposed adjacent to each of the plurality of source gas injectors.

[8] The apparatus of claim 7, wherein the exhaust channel is surrounded and formed by an outer wall of the reactor, a ring-shaped bottom extending from the outer wall of the reactor toward the substrate support unit, and a ring-shaped inner wall disposed between the substrate support unit and the outer wall of the reactor, extending upward from the ring-shaped bottom and spaced apart by a predetermined distance from the outer wall of the reactor.

[9] The apparatus of claim 7 or 8, wherein the plurality of source gas injectors are disposed spaced apart by a predetermined angle about a center of the gas injection unit, and the exhaust port is disposed at a lower region of each of the plurality of source gas injectors.

[10] The apparatus of claim 7 or 8, wherein the exhaust unit further comprises a ring- shaped plate baffle installed to cover an open upper surface of the exhaust channel and having a plurality of gas inlets penetrating an upper surface and a lower surface thereof such that the at least two source gases can be introduced into the exhaust channel.

[11] The apparatus of claim 7 or 8, further comprising a plurality of pumps connected with the respective exhaust ports.

[12] The apparatus of any of claims 1, 2, 7 and 8, wherein the gas injection unit further comprises a central purge gas injector disposed at a center of the source gas injectors arranged radially to inject the purge gas for purging the source gases such that the at least two source gases are not mixed over the substrate support unit.

[13] The apparatus of any of claims 1, 2, 7 and 8, wherein one of the gas injection unit and the substrate support unit has a protruding portion formed at a center thereof and the other has an insertion groove portion to receive the protruding portion.

[14] An apparatus for depositing a thin film comprising: a plurality of process chambers each including D) a reactor;

D) a substrate support unit rotatably installed inside the reactor and provided with a plurality of substrate loading parts on which a plurality of substrate are respectively loaded;

D) a gas injection unit including a plurality of source gas injectors supplying at least two different source gases onto the substrate support unit and a plurality of purge gas injectors disposed between the plurality of source gas injectors to supply a purge gas purging the source gases onto the substrate support unit, the plurality of source gas injectors and the plurality of purge gas injectors being radially installed on the substrate support unit;

D) an exhaust unit provided in a ring shape to surround an outer circumference of the substrate support unit and including: an exhaust channel having a plurality of exhaust ports guiding and exhausting the at least two source gases to the outside of the reactor; and a plurality of partition plates installed in the exhaust channel and partitioning the exhaust channel into a plurality of exhaust passages isolated from each other such that the at least two source gases supplied through the plurality of source gas injectors are exhausted to the outside through different paths; and a plurality of pumps configured to exhaust the gases in the plurality of process chambers to the outside, wherein each of the plurality of pumps is connected with at least one of the plurality of exhaust passages of each of the plurality of process chambers, exhausting the same kind of gas.

[15] An apparatus for depositing a thin film comprising: a plurality of process chambers each including: D) a reactor;

D) a gas injection unit including a plurality of source gas injectors supplying at least two different source gases onto the substrate support unit and a plurality of purge gas injectors disposed between the plurality of source gas injectors to supply a purge gas purging the source gases onto the substrate support unit, the plurality of source gas injectors and the plurality of purge gas injectors being radially installed on the substrate support unit; and

D) an exhaust unit provided in a ring shape to surround an outer circumference of the substrate support unit and including: an exhaust channel configured to guide and exhaust the at least two source gases to the outside of the reactor; and a plurality of exhaust ports exhausting the at least two source gases; and a plurality of pumps configured to exhaust the gases in the plurality of process chambers to the outside, wherein at least one of the plurality of exhaust ports are disposed adjacent to each of the plurality of source gas injectors such that the source gases supplied through the respective source gas injectors are exhausted to the outside through different exhaust ports, and each of the plurality of pumps is connected with at least one of the plurality of exhaust ports of each of the plurality of process chambers, exhausting the same kind of gas.