KR20100013592A - Atomic layer deposition apparatus - Google Patents

Abstract

PURPOSE: An atomic layer deposition apparatus is provided to keep the temperature of a substrate and a susceptor constant by maintain the distance between susceptor and a heater constant and heating the substrate uniformly. CONSTITUTION: A susceptor(120) is installed in a process chamber(110) and mounts and rotates a plurality of the substrates(W). The susceptor includes a rotary shaft(121) which is installed in a lower part of the susceptor and lifts and rotates the susceptor. A heater(140) is installed in a lower part of the susceptor and heats the susceptor and the substrate. A heater lifting unit(141) lifts the heater while maintaining the distance between the susceptor and the heater constant when ascending and descending the susceptor.

Description

Atomic Layer Deposition Apparatus {ATOMIC LAYER DEPOSITION APPARATUS}

The present invention relates to an atomic layer deposition apparatus, and more particularly, to provide an atomic layer deposition apparatus capable of maintaining a uniform distance between a heater and a susceptor to improve temperature uniformity of a susceptor and a substrate and to improve film quality. do.

In general, in order to deposit a thin film having a predetermined thickness on a substrate such as a semiconductor wafer or glass, physical vapor deposition (PVD) using physical collision such as sputtering and chemical vapor deposition using chemical reaction thin film manufacturing method using (chemical vapor deposition, CVD) or the like is used.

The chemical vapor deposition method includes atmospheric pressure chemical vapor deposition (APCVD), low pressure chemical vapor deposition (low pressure CVD, LPCVD), plasma enhanced chemical vapor deposition (plasma enhanced CVD, PECVD), and the like. Plasma organic chemical vapor deposition has been widely used due to the advantages of being able to deposit and fast forming thin films.

However, as the design rule of the semiconductor device is drastically fined, a thin film of a fine pattern is required, and the step height of the region where the thin film is formed is also very large. As a result, the use of an atomic layer deposition (ALD) method capable of forming a very fine pattern of atomic layer thickness very uniformly and having excellent step coverage is increasing.

The atomic layer deposition method (ALD) is similar to the conventional chemical vapor deposition method in that it uses chemical reactions between gas molecules. However, conventional chemical vapor deposition (CVD) methods inject a plurality of gas molecules into the process chamber at the same time to deposit reaction products generated above the substrate onto the substrate, whereas atomic layer deposition processes a single gaseous material. It is different in that it injects into the chamber and then purges it so that only the physically adsorbed gas remains on top of the heated substrate, and then another gaseous material is deposited to deposit chemical reaction products that occur only on the upper surface of the substrate. .

The thin film implemented through such an atomic layer deposition method has a very good step coverage characteristics, and has the advantage that it is possible to implement a pure thin film having a low impurity content.

In general, in the atomic layer deposition apparatus, different types of source gases are injected while the showerhead or susceptor rotates at high speed, and the substrate sequentially passes through the source gases to form a thin film on the substrate surface. In addition, in the conventional atomic layer deposition apparatus, a substrate is loaded into a process chamber and loaded into a susceptor, a thin film is formed while rotating at high speed while the susceptor is raised at a predetermined height, and then the susceptor is returned to the loading position when the deposition process is completed. Strong to unload the substrate.

By the way, in the conventional atomic layer deposition apparatus is provided with a heater for heating the substrate in the process chamber, there is a problem that the temperature of the substrate is changed by changing the distance between the heater and the susceptor according to the lifting movement of the susceptor. That is, at the beginning and end of the deposition process, the temperature of the substrate increases due to the distance between the susceptor and the heater, and the temperature of the substrate decreases due to the distance between the susceptor and the heater during the deposition process.

In addition, in order to secure the lifting movement distance of the susceptor, the heater should be installed at least more than the lifting movement distance of the susceptor from the lower end of the susceptor. Therefore, the distance between the susceptor and the heater is substantially limited by the lifting movement distance of the susceptor and it is difficult to keep in close contact. As the distance between the susceptor and the heater increases, it is more difficult to uniformly heat the temperature of the susceptor and the substrate in the heater, thereby degrading the quality of the thin film deposited on the substrate.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and to provide an atomic layer deposition apparatus capable of maintaining a constant distance between a susceptor and a heater.

The present invention also provides an atomic layer deposition apparatus capable of bringing a susceptor into close contact with a heater.

According to embodiments of the present invention for achieving the above object of the present invention, the atomic layer deposition apparatus includes a process chamber; A susceptor provided in the process chamber and having a plurality of substrates mounted thereon to rotate, and provided at a lower portion of the susceptor, the susceptor including a rotating shaft for lifting and rotating the susceptor; A heater lifter provided below the susceptor to heat the susceptor and the substrate, and a heater lifter configured to move the heater up and down while maintaining a constant distance between the susceptor and the heater when the susceptor moves up and down. .

In an embodiment, the heater lifting unit includes a lifting shaft provided below the heater and a heater driving unit provided on the lifting shaft to move up and down the heater. Here, the susceptor is provided on the rotating shaft includes a susceptor drive unit for lifting and rotating the susceptor, the heater lifting unit is connected to the heater drive unit and the susceptor drive unit to simultaneously the heater and the susceptor A lifting control unit for moving is provided.

In an embodiment, the lifting shaft includes a main lifting shaft connected to the heater driving unit for lifting and lowering the heater, and a guide shaft for assisting the lifting movement of the heater without being connected to the heater driving unit. Here, the main lifting shaft is provided to support the lower edge of the heater. Alternatively, the main lifting shaft is provided at an intermediate position between the center and the edge of the heater. In addition, the main lifting shaft is provided with a plurality of main lifting shaft symmetrically with respect to the rotation axis. Here, the guide shaft is provided to support the lower edge of the heater and a plurality of guide shafts are provided symmetrically with respect to the rotation axis.

In an embodiment, a plurality of main lifting shafts may be provided with heater driving units, respectively.

In an embodiment, the heater lifting unit includes a support plate provided below the heater to support the heater. For example, the support plate has a size equal to or greater than that of the heater. The support plate is formed of a ceramic material.

In an embodiment, a temperature controller for controlling the temperature of the heater is included. The temperature control part includes a control wire for electrically connecting the temperature control part and the heater and a wire receiving shaft for receiving the control wire and protecting the control wire through the process chamber. And the wire receiving shaft may be formed to be moved up and down in accordance with the lifting movement of the heater. Alternatively, the wire receiving shaft may be formed to be stretchable according to the lifting movement of the heater.

In an embodiment, the heater has a circular plate shape, and the rotating shaft is coupled through the central portion of the heater.

According to the present invention, first, since the heater moves up and down at the same time as the susceptor moves up and down, the distance between the susceptor and the heater can be kept constant. That is, the susceptor and the substrate can be uniformly heated even when the susceptor moves up and down and when the substrate is loaded / unloaded.

Second, since the heater moves up and down at the same time as the susceptor, it is not necessary to separate the susceptor and the heater to secure the lifting movement distance of the susceptor, so that the susceptor and the heater can be brought into close contact with each other.

In addition, since the distance between the susceptor and the heater is closer, the substrate can be uniformly heated in the heater.

Although the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, the present invention is not limited or restricted by the embodiments.

1 and 2 are cross-sectional views of an atomic layer deposition apparatus according to an embodiment of the present invention, Figure 1 shows the position of the susceptor and heater when the deposition process is performed, Figure 2 shows the loading and unloading of the substrate The position of the susceptor and heater for loading is shown. 3 is a plan view illustrating the heater according to the line I-I of FIG. 1.

Hereinafter, an atomic layer deposition apparatus according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3.

1 and 2, the atomic layer deposition apparatus 100 includes a process chamber 110, a susceptor 120, a showerhead 130, a heater 140, and a heater lifter 141. .

The process chamber 110 accommodates the substrate W to provide a space in which the deposition process is performed.

Here, the substrate W may be a silicon wafer. However, the present invention is not limited thereto, and the substrate W may be a transparent substrate including glass used for a flat panel display device such as a liquid crystal display (LCD) and a plasma display panel (PDP). In addition, the substrate W is not limited in shape and size by drawing, and may have substantially various shapes and sizes, such as circular and rectangular plates.

The shower head 130 is provided above the process chamber 110 to provide deposition gas to the surface of the substrate W supported by the susceptor 120.

The deposition gas includes a source gas containing a material constituting a thin film to be formed on the surface of the substrate (W) and a purge gas for purging the source gas. In addition, according to the present embodiment, two different kinds of gases that react with each other to form a thin film material are used. As the purge gas, source gases, the substrate W, and the substrate W are formed. A stable gas is used that does not react chemically with the thin film.

The susceptor 120 is provided in the process chamber 110 and supports the plurality of substrates (W). Here, the susceptor 120 is a semi-batch type having excellent throughput, and a plurality of substrates W are arranged to support one surface on the same plane and are disposed on the surface of the susceptor 120. Radially along the circumferential direction.

The susceptor 120 rotates so that the substrate W revolves about the center point of the susceptor 120, and a rotation shaft 121 for rotating the susceptor 120 below the susceptor 120. And a susceptor driver 125 are provided. The susceptor driver 125 lifts and moves the susceptor 120 as well as the rotation of the susceptor 120.

The heater 140 is provided below the susceptor 120 to heat the substrate W and the susceptor 120. For example, the heater 140 has a circular plate shape corresponding to the susceptor 120, and the rotating shaft 121 is axially coupled through the center of the heater 140.

On the other hand, the susceptor 120 is moved up and down a predetermined distance in the process chamber 110, the heater 140 to maintain the distance between the susceptor 120 is constant It moves up and down simultaneously with 120. Specifically, as shown in FIG. 2, the susceptor 120 is loaded into the process chamber 110 to load and unload the substrate W onto the susceptor 120 for a deposition process. Move down a certain distance. As shown in FIG. 1, when the deposition process of the substrate W is performed, the susceptor 120 moves upward to perform the deposition process. Here, the heater 140 is provided to be spaced apart from the rear surface of the susceptor 120 by a predetermined distance, while maintaining the distance to the susceptor 120 at the same time as the lifting and lowering of the susceptor 120. Move up and down.

Here, the temperature uniformity of the substrate W and the quality of the thin film formed on the substrate W are affected by the distance between the susceptor 120 and the heater 140. Therefore, in the present embodiment, the heater 140 is raised and lowered simultaneously with the susceptor 120 while maintaining a constant distance between the heater 140 and the susceptor 120 when the susceptor 120 moves up and down. As a result, the distance between the susceptor 120 and the heater 140 may be kept constant at all times, and the temperature of the susceptor 120 and the substrate W may be kept uniform at all times.

On the other hand, according to the present embodiment, the rotation shaft 121 and the susceptor 120 is separated, so that the susceptor 120 can be rotated.

In detail, the heater lifting unit supporting the heater 140 and lifting and lowering the heater 140 at the same time as the susceptor 120 moves up and down when the heater 140 moves up and down ( 141 is provided.

The heater lifter 141 includes a lift shaft 410, a heater driver 415, and a lift controller 416.

The lifting shaft 410 is provided below the heater 140 to become a shaft for lifting and moving the heater 140.

For example, two or more lifting shafts 410 are provided to support the lower edge of the heater 140. In addition, the plurality of lifting shafts 410 are provided at positions symmetrical with respect to the rotation shaft 121. However, the present invention is not limited thereto, and the number and arrangement of the lifting shafts 410 may be changed in various ways.

Here, the lifting shaft 410 is connected to the heater driving unit 415 to assist the lifting movement of the main lifting shaft (411, 412) and the heater 140 to move up and down the heater 140 substantially. The guide shaft 413 is included. The guide shaft 413 is disposed around the main lifting shafts 411 and 412 to prevent the center of the heater 140 from being disturbed or moving during the lifting movement of the heater 140.

For example, two main lifting shafts 411 and 412 are disposed 180 degrees apart from each other, and the four guide shafts 413 are disposed at left and right sides of the main lifting shafts 411 and 412, and the guide shafts are disposed. 413 are spaced apart from each other at uniform intervals. However, the number and positions of the main lifting shafts 411 and 412 and the number and positions of the guide shafts 413 are not limited to the drawings and may be changed in various ways.

The main lift shafts 411 and 412 are provided with a heater driver 415 for lifting and lowering of the heater 140. For example, the heater driving unit 415 may be a motor for moving the main lifting shafts 411 and 412 up and down.

On the other hand, the heater driving unit 415 is provided to move the two main lifting shafts (411, 412) at the same time. For example, one heater driver 415 is simultaneously connected to the two main lifting shafts 411 and 412 to move the main lifting shafts 411 and 412 up and down. In addition, since the susceptor 120 and the heater 140 must be moved up and down at the same time, the susceptor 120 and the heater 140 are connected to the heater driver 415 and the susceptor driver 125. Elevation control unit 416 is provided to control the lifting movement of the.

The support plate 142 supporting the lower portion of the heater 140 is provided under the heater 140.

Here, the support plate 142 may be a circular plate having the same size and shape as the heater 140. Alternatively, as shown in FIG. 3, the support plate 142 may have a portion larger than the heater 140 or at least partially protruded to the outside of the heater 140 so that the lifting shaft 410 may be coupled thereto. Have

The support plate 142 partially blocks the heat of the heater 140 from being discharged to the lower portion of the process chamber 110, thereby allowing the structure of the lower portion of the heater 140 and the lower portion of the process chamber 110 to be separated from the heater ( It protects against heat of 140). In addition, the heat generated from the heater 140 by the support plate 142 is discharged to the upper portion of the heater 140 that is not provided with the support plate 142 to the heat of the heater 140 It serves to improve the efficiency delivered to the susceptor 120 and the substrate (W).

In addition, the support plate 142 is provided on the entire bottom surface of the heater 140 to increase the effects described above.

The support plate 142 may be a ceramic material.

A temperature controller 143 is provided to control the temperature of the heater 140. The temperature controller 143 is provided outside the process chamber 110, and a control wire 431 connecting the heater 140 and the temperature controller 143 is provided through the process chamber 110. . In addition, the wire receiving shaft 432 is provided to prevent the control wire 431 from being damaged by the heat of the heater 140, and to protect in the deposition environment in the process chamber 110. The control wire 431 and the wire receiving shaft 432 may be connected to the lower portion of the heater 140, and the wire receiving shaft 432 may be moved up and down with respect to the lifting movement of the heater 140. have. Alternatively, the wire receiving shaft 432 may be formed to be stretchable by the lifting movement of the heater 140.

4 is a cross-sectional view illustrating an atomic layer deposition apparatus according to another embodiment of the present invention, and FIG. 5 is a plan view of a heater taken along line II-II in the atomic layer deposition apparatus of FIG. 4.

Hereinafter, an atomic layer deposition apparatus and a heater according to another embodiment of the present invention will be described with reference to FIGS. 4 and 5. The atomic layer deposition apparatus according to the embodiment described below is substantially the same as the atomic layer deposition apparatus described with reference to FIGS. 1 to 3 except for some components of the heater lifter, and the same names and reference numerals for the same components. And duplicate descriptions are omitted.

Referring to the drawings, the heater lifting unit 241 for raising and lowering the heater 140 is provided while maintaining a constant distance between the susceptor 120 and the heater 140 during the lifting movement of the susceptor 120. do.

The heater lifter 241 includes a support plate 142, a lift shaft 420, and heater drivers 424 and 425.

The support plate 142 is provided on the bottom surface of the heater 140 to support the bottom surface of the heater 140 and to couple the heater 140 and the lifting shaft 420. In addition, the support plate 142 is provided on the bottom surface of the heater 140 to prevent heat generated from the heater 140 to be discharged to the lower portion of the heater 140 to protect the structure under the heater 140. And, the heat discharged from the heater 140 serves to discharge only to the heater 140.

The support plate 142 has a plate shape having a shape corresponding to the bottom surface of the heater 140. For example, the heater 140 has a circular plate shape in which the rotating shaft 121 penetrates a central portion of the heater 140, and the support plate 142 corresponds to the heater 140. It has the form of a circular plate having an area and a shape.

The lifting shaft 420 is provided below the heater 140 to become an axis supporting the lifting movement of the heater 140. For example, the lifting shaft 420 supports the middle portion of the ring-shaped heater 140. That is, the lifting shaft 420 is provided at about a half of the distance connecting the outer circumferential edge and the inner circumferential edge of the heater 140 in the radial direction of the heater 140. In addition, the lifting shaft 420 is provided with two lifting shafts 420 spaced 180 degrees apart from each other. However, the position of the elevating shaft 420 is not limited to the drawings, the elevating shaft 420 is provided with substantially various positions and various numbers of elevating shaft 420 to support the heater 140. Can be.

On the other hand, in the present embodiment, unlike the above-described embodiment, the main lifting shafts 421 and 422 provided with the heater driving units 424 and 425 respectively under the two lifting shafts 420, and the heater ( A guide shaft for assisting the lifting movement of 140 is not provided. This is because the main lifting shafts 421 and 422 are disposed at a position close to the center of gravity of the heater 140, so that only the two lifting shafts 420 can lift and move the heater 140 smoothly. Meanwhile, although two lifting shafts 420 are shown in the drawings, the present invention is not limited to the drawings, and the number of the lifting shafts 420 may be changed in various ways.

The heater driving units 424 and 425 are provided under the lifting shaft 420 to generate driving force for lifting and lowering the lifting shaft 420.

Here, one heater driving unit 424 and 425 is provided on the main lifting shafts 421 and 422, respectively. That is, in the present embodiment, the main lifting shafts 421 and 422 are moved up and down stably, and the weights of the main lifting shafts 421 and 422 and the heater 140 are stably in charge, but the heater driving unit 424 The heater driving units 424 and 425 are provided on the main lifting shafts 421 and 422, respectively, so as to minimize the size and output of the 425. In order to move the heater 140 up and down simultaneously with the susceptor 120, a lift controller 426 for controlling the heater drivers 424 and 425 and the susceptor driver 125 is provided.

As described above, although described with reference to the preferred embodiment of the present invention, those skilled in the art various modifications and variations of the present invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

1 is a cross-sectional view for explaining an atomic layer deposition apparatus according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view illustrating positions of a susceptor and a heater during loading and unloading of a substrate in the atomic layer deposition apparatus of FIG. 1; FIG.

3 is a plan view of the heater according to line I-I in FIG. 1;

4 is a cross-sectional view illustrating an atomic layer deposition apparatus according to another embodiment of the present invention;

FIG. 5 is a plan view of a heater taken along line II-II in the atomic layer deposition apparatus of FIG. 4.

<Explanation of symbols for the main parts of the drawings>

100: atomic layer deposition apparatus 110: process chamber

120: susceptor 121: rotation axis

125: susceptor drive unit 130: shower head

140: heater 141, 241: heater lifting unit

142: support plate 143: temperature control unit

410, 420: lifting shaft 411, 412, 421, 422: main lifting shaft

413: guide shaft 415, 424, 425: heater drive unit

416, 426: lifting control unit 431: control wire

432: wire receiving shaft W: substrate

Claims (17)

Process chambers; A susceptor provided in the process chamber and having a plurality of substrates mounted thereon to rotate, and provided at a lower portion of the susceptor, the susceptor including a rotating shaft for lifting and rotating the susceptor; A heater provided below the susceptor to heat the susceptor and the substrate; And A heater lifter configured to move the heater up and down while maintaining a constant distance between the susceptor and the heater when the susceptor moves up and down; Atomic layer deposition apparatus comprising a. The method of claim 1, The heater lifting unit, A lifting shaft provided under the heater; And A heater driving unit provided at the lifting shaft to move up and down the heater; An atomic layer deposition apparatus comprising a. The method of claim 2, The susceptor is provided on the rotating shaft includes a susceptor drive unit for lifting and rotating the susceptor, And the heater lifter is further provided with a lift controller connected to the heater driver and the susceptor driver to simultaneously move the heater and the susceptor. The method of claim 3, The lifting shaft, A main lift shaft connected to the heater drive unit to move the heater in a lift; And A guide shaft which is not connected to the heater driving unit and assists the lifting movement of the heater; An atomic layer deposition apparatus comprising a. The method of claim 4, wherein And the main lift shaft is provided to support a lower edge of the heater. The method of claim 4, wherein The main lift shaft is an atomic layer deposition apparatus, characterized in that provided in the intermediate position between the center and the edge of the heater. The method of claim 4, wherein And the main lifting shaft is provided with a plurality of main lifting shafts symmetrically with respect to the rotation axis. The method of claim 4, wherein The guide shaft is provided to support the lower edge of the heater and the atomic layer deposition apparatus, characterized in that a plurality of guide shafts are provided symmetrically with respect to the rotation axis. The method of claim 4, wherein The atomic layer deposition apparatus characterized by the heater drive part provided in each of the several main lifting shafts. The method of claim 2, The heater lifting unit further comprises a support plate provided below the heater to support the heater. The method of claim 10, And the support plate has a size equal to or larger than that of the heater. The method of claim 11, And the support plate is formed of a ceramic material. The method of claim 1, An atomic layer deposition apparatus further comprises a temperature control unit for controlling the temperature of the heater. The method of claim 13, The temperature control unit, A control wire penetrating the process chamber to electrically connect the temperature control unit and the heater; And A wire receiving shaft which accommodates the control wire and protects the control wire; An atomic layer deposition apparatus comprising a. The method of claim 14, The wire receiving shaft is an atomic layer deposition apparatus, characterized in that the lifting movement is formed in accordance with the lifting movement of the heater. The method of claim 14, The wire receiving shaft is an atomic layer deposition apparatus, characterized in that formed to be stretchable in accordance with the lifting movement of the heater. The method of claim 1, The heater has a circular plate shape, the atomic layer deposition apparatus characterized in that the rotating shaft is coupled through the central portion of the heater.

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