JP2009302482A - Processing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a processing device that reduces flexure of a straightening wall disposed around a workpiece. <P>SOLUTION: In the processing device 2 for carrying out, for example, etching of the workpiece S disposed on a placement table 3 by supplying a processing gas into a processing chamber 20, a straightening member 5 connects a plurality of the straightening walls 51 extending along each side of the workpiece S so that the workpiece S is enclosed. Both end portions of each straightening wall 51 are supported by a supporting member 52, and the upper limb thereof is gradually formed high in a direction of a center of the straightening wall 51 while a lower limb thereof is formed parallel to an upper surface of the placement table. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention supplies a processing gas to a target object such as a glass substrate for an FPD (flat panel display) in a processing container, and performs a predetermined process on the target object with this processing gas. Regarding technology.

In the manufacturing process of LCD (Liquid Crystal Display), there is a process of performing an etching process on an aluminum (Al) film formed on a glass substrate. An example of an etching processing apparatus that performs this process will be briefly described with reference to FIG. 12. In FIG. 12, reference numeral 1 denotes a vacuum chamber. Inside the vacuum chamber 1, for example, an FPD substrate S (hereinafter referred to as an object to be processed). A mounting table 11 for mounting a substrate S) is provided, and a processing gas supply unit 12 serving as an upper electrode is provided so as to face the mounting table 11. Then, an etching gas made of, for example, chlorine (Cl ₂ ) -based gas is supplied from the processing gas supply unit 12 into the vacuum chamber 1, and the vacuum chamber 1 is evacuated by a vacuum pump (not shown) through the exhaust path 13, while high frequency By applying high frequency power from the power source 14 to the mounting table 11, plasma of an etching gas is formed in the space above the substrate S, whereby the etching process for the substrate S is performed.

  By the way, in the etching of the Al film, the rate of supply is controlled, that is, the amount of etching gas supplied is proportional to the amount of etching. Therefore, the etching rate of the peripheral portion of the substrate S becomes extremely fast due to the loading effect, and the amount of etching increases. Phenomenon occurs. That is, in the peripheral portion of the substrate S indicated by reference numeral 15 in FIG. 13, when viewed from the Cl radical as an etchant, the etching area is about half that of the central area having the same area indicated by reference numeral 16. If the etching gas is supplied at the same flow rate as that supplied to the peripheral portion 15, the etching amount at the peripheral portion 15 is about twice that of the central region 16.

  For this reason, for example, as shown in FIGS. 12 and 14A, by providing a rectifying member 17 surrounding the periphery of the substrate S, the flow of the etching gas in the vicinity of the peripheral portion of the substrate S is blocked by the rectifying member 17, and the substrate S Measures have been taken to form a gas reservoir region around the slag. According to this method, the etching gas flow rate in the region can be reduced, and the uniformity of the etching rate within the substrate surface can be improved.

  However, when such a rectifying member 17 is provided, for example, when the upper end of the rectifying member 17 is higher than the conveying height of the substrate S carried in from the loading / unloading port 10 provided in the side wall portion of the vacuum chamber 1, The inside substrate S and the rectifying member 17 interfere with each other. Therefore, for example, as shown in FIG. 14B, there is a type in which the rectifying member 17 is movable up and down and the substrate S is carried in and out through a gap formed by raising the rectifying member 17 from the mounting table 11.

  Here, the rectifying member 17 forms a frame by combining four rectifying walls 171 made of, for example, a ceramic plate material, and the frame is mounted on the mounting table 11 so as to surround the substrate S. Yes. Protrusions 172 are provided on the side surfaces of the two rectifying walls 171 facing each other among these four sheets so as to extend to the outside of the mounting table 11, and the rectifying members 17 are provided on the lower surfaces of the respective projecting parts 172. A supporting rod 181 to be supported is connected. The entire rectifying member 17 can be moved up and down by moving each of the support bars 181 in the vertical direction by the lifting mechanism 18.

  On the other hand, in recent years, the FPD substrate S has been further increased in size, and for example, an etching processing apparatus for processing the substrate S having a side of 2 m or more has been developed. In such an etching processing apparatus, the rectifying member 17 surrounding the substrate S also needs to be large in size with a side of 2 m or more. In particular, the rectifying wall 171 constituting the rectifying member 17 is formed in the vacuum chamber 1. Since it is made of ceramic as described above for the purpose of suppressing the influence on the plasma, each rectifying wall 171 is significantly increased in weight.

  Here, for example, as shown in FIG. 15 (a), an elongated rectangular rectifying wall 171 having a height "h" to the upper edge of, for example, about 50 mm to 150 mm is formed, and both ends thereof are supported from the mounting table 11. In the case of raising, the center portion of the rectifying wall 171 whose length “L” is increased to 2 m or more, for example, may bend due to its own weight. When the rectifying wall 171 is bent, for example, as shown in FIG. 15B, the central portion of the rectifying wall 171 protrudes downward and becomes an obstacle when transporting the substrate S, or the rectifying member is shown in FIG. 15C. When the 17 is placed on the mounting table 11, the rectifying member 17 comes into a so-called “one-sided” state from the bent central portion of the rectifying member 17, and the operation is repeated to repeat the operation. May be worn locally to generate dust or breakage.

  In this respect, for example, as shown in FIG. 14A, for example, the conventional rectifying member 17 supports the lower edge portions of the four corners by the protruding portions 172, thereby averaging the load applied to the rectifying wall 171. An excessive weight is added to a specific rectifying wall 171 to avoid an increase in deflection. However, with the recent increase in the size of the substrate S, the reduction of the deflection is not sufficient in the response such as the dispersion of the load, and further measures for increasing the weight are required.

  In order to reduce the deflection due to the weight increase, for example, a method of increasing the rigidity “h” of the rectifying member 17 shown in FIG. Since the weight of the member 17 is further increased, the load on the elevating mechanism 18 is large and the drive system may need to be updated. Further, at the time of maintenance of the etching processing apparatus and the like, at present, the rectifying member 17 can be removed and attached, for example, manually. However, as the weight increases, equipment such as a crane becomes necessary and the maintainability deteriorates. There is also a case.

  On the other hand, in the case where the central portion of the rectifying wall 171 is bent by supporting both ends, a method of supporting the rectifying wall 171 by adding a support bar 181 to a position where the deflection is generated is also conceivable. However, for example, it is not appropriate to provide the support rod 181 and its lifting mechanism 18 on all the four rectifying walls 171 from the viewpoint of cost increase, and a new one is provided between the added support rod 181 and the existing support rod 181. In some cases, deflection may occur. In addition, for example, if the support bar 181 is provided in the central portion of the rectifying wall 171 arranged on the loading / unloading port 10 side of the substrate S, the support rod 181 becomes an obstacle when the substrate S is loaded / unloaded. There is also a problem that it becomes impossible to carry in and out.

Here, Patent Document 1 describes a rectifying member in which the height of the portion corresponding to the four corners of the square substrate is maximized, and Patent Document 2 describes the rectifying wall in the region corresponding to the four corners. A rectifying member in which an etching gas passage is formed by cutting out the upper portion of is described. However, all of these techniques are techniques aiming only at improving the in-plane uniformity of etching, and there is no description of any means for solving the deflection generated with the enlargement of the rectifying wall.
JP 2000-315676; Paragraphs 0021 to 0023, FIGS. 1 to 3 JP 2003-243364; paragraph 0056, FIG.

  This invention is made | formed in view of such a situation, The objective is to provide the processing apparatus which can reduce the deflection | deviation of the rectifying wall provided around the to-be-processed object.

A processing apparatus according to the present invention is provided inside a processing container, and a mounting table for mounting an object to be processed,
A processing gas supply means for supplying a processing gas from the upper side of the mounting table and processing the target object mounted on the mounting table;
A gas exhaust unit for exhausting the gas in the processing container;
A plurality of rectifying walls extending along each side of the object to be processed on the mounting table, and a rectifying member configured to surround the object to be processed;
A support member that supports both ends of the flow straightening wall,
The rectifying wall has an upper edge formed in a shape that gradually increases toward a central portion of the rectifying wall, and a lower edge formed in parallel with the upper surface of the mounting table.

  Here, it is preferable that the upper edge of the rectifying wall is formed so as to increase continuously or stepwise, for example, like an arch shape, toward the center of the rectifying wall. You may form so that the upper edge of a wall may become high gradually toward the both ends of the said baffle wall.

Further, a processing apparatus according to another invention is provided inside the processing container, and a mounting table for mounting the object to be processed,
A processing gas supply means for supplying a processing gas from the upper side of the mounting table and processing the target object mounted on the mounting table;
A gas exhaust unit for exhausting the gas in the processing container;
A plurality of rectifying walls extending along each side of the object to be processed on the mounting table, and a rectifying member configured to surround the object to be processed;
A support member that supports both ends of the flow straightening wall,
The rectifying wall includes a first block member and a second block made of a member having a lower density than a member constituting the first block member on at least one of the upper side and the lower side of the first block member. The first block material is formed such that the vertical dimension of the first block material gradually increases toward the center of the rectifying wall.
Here, the vertical dimension of the first block material is preferably formed so as to increase continuously or stepwise toward the central portion of the rectifying wall, and the first block material is ceramic. Preferably, the second block material is made of a porous ceramic.

  Furthermore, each processing apparatus listed above may include an elevating mechanism for elevating the rectifying member between the upper surface of the mounting table and a position above the mounting table by elevating the support member. . In each of these processing apparatuses, the object to be processed is preferably a square substrate, and the rectifying wall is preferably configured to extend along each side of the square substrate.

  According to the present invention, since the upper edge of the rectifying wall constituting the rectifying member is gradually increased toward the central portion of the rectifying wall, the occurrence of deflection is effectively prevented at the central portion where the deflection is maximum. On the other hand, in the regions on both sides where the deflection does not increase as much as the central portion, the upper edge of the rectifying wall is made lower than the central portion, thereby suppressing an increase in the weight of the rectifying wall. By providing these features, even in a rectifying member disposed around a large object to be processed, the deflection at the central portion of the rectifying wall is reduced, and the object to be processed collides with these members during loading and unloading. Such troubles can be avoided. In addition, the situation where the rectifying member is placed on the mounting table in a piece-by-piece state is unlikely to occur, and troubles such as wear, dust generation and breakage due to piece-by-piece are avoided, and in-plane uniformity is good. An etching process can be performed.

  Hereinafter, the configuration of the etching processing apparatus 2 according to the present embodiment will be described with reference to FIGS. The etching processing apparatus 2 shown in the longitudinal sectional view of FIG. 1 is configured as an apparatus for performing an etching process on an object to be processed, for example, an aluminum (Al) film formed on the surface of a substrate S which is a square FPD substrate. Has been.

  The etching processing apparatus 2 includes a processing container 20 that is a vacuum chamber for performing an etching process on the substrate S therein. In the etching processing apparatus 2 according to the present embodiment, the planar shape of the processing vessel 20 is also square, for example, so that a large square substrate having a long side of 2 m or more can be processed, for example. For example, the horizontal cross section is formed to have a size of about 3.5 m on one side and about 3.0 m on the other side. The processing container 20 is made of a material having good thermal conductivity and conductivity, such as aluminum, and the processing container 20 is grounded. Further, a loading / unloading port 22 for loading the substrate S into the processing container 20 is formed in one side wall portion 21 of the processing container 20, and the loading / unloading port 22 is configured to be opened and closed by a gate valve 23. .

  Inside the processing container 20, a mounting table 3 for mounting the substrate S is disposed on the upper surface thereof. The mounting table 3 is electrically connected to the first high-frequency power supply unit 311 for generating plasma and the second high-frequency power supply unit 312 for drawing ions in the plasma, and generates plasma in the processing vessel 20. It plays a role of drawing ions in the plasma into the surface of the substrate S. The mounting table 3 is disposed on the bottom surface of the processing container 20 via an insulating member 32, whereby the mounting table 3, which is a lower electrode, is in an electrically floating state from the processing container 20.

  Further, the peripheral edge and the side surface of the upper surface of the mounting table 3 are covered with a focus ring 33 made of a ceramic material for uniformly forming plasma above the mounting table 3. The focus ring 33 serves to adjust the plasma state in the peripheral region of the substrate S, for example, to concentrate the plasma on the substrate S to improve the etching rate.

  Further, the mounting table 3 is provided with elevating pins 34 for transferring the substrate S between a transfer device (not shown) provided outside and the mounting table 3. The elevating pins 34 are connected to an elevating mechanism 35 for freely projecting and retracting from the surface of the mounting table 3, and the substrate S is placed between the position where the substrate S is transferred and the mounting area described above. Can be moved up and down.

  On the other hand, a flat plate-like upper electrode 4 is provided above the mounting table 3 so as to face the upper surface of the mounting table 3, and the upper electrode 4 is supported by a square plate-like upper electrode base 41. Yes. The upper electrode 4 and the upper electrode base 41 are made of, for example, aluminum, and the upper electrode 4 is electrically connected to the processing container 20 by connecting the upper surface of the upper electrode base 41 to the ceiling of the processing container 20. It has become. The space surrounded by the upper electrode base 41 and the upper electrode 4 constitutes a gas diffusion space 42 for the etching gas. Hereinafter, the upper electrode 4 and the gas diffusion space 42 are collectively referred to as a gas shower head 40. In this example, the gas shower head 40 constitutes a processing gas supply means.

  A processing gas supply path 43 is provided on the ceiling of the processing container 20 so as to be connected to the gas diffusion space 42, and the other end side of the processing gas supply path 43 is connected to the processing gas supply section 44. ing. When the etching gas is supplied from the processing gas supply unit 44 to the gas diffusion space 42, the etching gas is supplied to the processing space above the substrate S through the gas supply hole 45 provided in the upper electrode 4. The etching process for the substrate S proceeds. On the other hand, one end side of an exhaust passage 24 constituting a gas exhaust portion is connected to the bottom wall of the processing vessel 20, and a vacuum pump (not shown) is connected to the other end side, for example.

  Furthermore, the etching processing apparatus 2 according to the present embodiment includes a rectifying member 5 for countermeasure against loading, and the rectifying member 5 is a deflection generated in the rectifying wall 51 constituting the rectifying member 5 as the substrate S is enlarged. The structure is reduced. Hereinafter, the details of the flow regulating member 5 will be described.

  For example, as shown in FIGS. 2 and 3, the rectifying member 5 has four rectifying walls 51 arranged so as to extend along each side of the substrate S on the mounting table 3, and connects these rectifying walls 51. This is a member formed into a square frame shape. The rectifying walls 51 may be fixed by a not-shown stopper or bolt made of ceramic, for example, or may be fixed by a ceramic bond or the like.

  At the lower edges of the four corners of the square rectifying member 5, for example, a ceramic plate such as an alumina sintered body that protrudes horizontally from the rectifying walls 51 located on the left and right sides as viewed from the loading / unloading port 22. Support members 52 are provided, and support rods 53 for raising and lowering the rectifying member 5 are connected to the tip portions of the support members 52 via the support members 52. Each support bar 53 penetrates the bottom surface of the processing container 20 and is connected to an elevating mechanism 61 provided outside the processing container 20 via an elevating plate 62. The rectifying member 5 can be raised and lowered between the upper surface of the mounting table 3 and the position above it by raising and lowering the support bar 53 in synchronization with the elevating mechanism 61. Here, at a portion where the support bar 53 penetrates the processing container 20, for example, a bellows 63 that connects the processing container 20 and the lifting plate 62 and covers the support bar 53 is provided, and a vacuum in the processing container 20 is provided. The degree can be maintained.

  The substrate S carried in / out from the carry-in / out port 22 is transported through a gap between the rectifying member 5 and the mounting table 3 formed by raising the rectifying member 5. The substrate S can be transported without interfering with these support rods 53 by being provided left and right away from the rectifying wall 51 as viewed from the loading / unloading port 22 through the support member 52. In FIG. 1, for convenience, the rectifying wall 51 facing the loading / unloading port 22 is illustrated as being provided with a support member 52, a support bar 53, and the like, but actually facing the loading / unloading port 22 as described above. It is the structure which provided these in the rectifying wall 51 which has not been performed.

  Here, looking at the force applied to each rectifying wall 51 in a state where the rectifying member 5 is raised from the mounting table 3, the rectifying wall 51 is supported at both ends by the support member 52, based on its own weight, etc. Distribution load is applied. According to such a load, when the portion supported by the support member 52 is an end portion, the deflection of the rectifying wall 51 is maximized at the center portion between these two adjacent end portions, and any mitigation measures are taken. If not, the same state as that of the conventional rectifying wall 171 described in the background art with reference to FIG. As already described in the background art, such a deflection of the rectifying wall 51 may cause an obstacle when the substrate S is carried in, or may cause a contact with the mounting table 3.

  Therefore, as shown in FIG. 4, for example, the rectifying wall 51 according to the present embodiment is formed in a shape, for example, an arch shape, in which the upper edge is gradually increased so that the central portion in the length direction becomes the highest. The broken line in FIG. 4 shows the height position of the upper edge of the rectifying wall 171 of the conventional size. However, in the rectifying wall 51 according to the present embodiment, the rectifying wall 51 is arranged at the center where the deflection becomes the largest. By making it higher than before, the rigidity of the rectifying wall 51 at this position is improved, and the occurrence of deflection is effectively reduced. On the other hand, in the region on the end side where the deflection does not increase as much as the central portion, the upper edge of the rectifying wall 51 is set to the same height as the conventional rectifying wall 171 to suppress an increase in the weight of the entire rectifying wall 51. It becomes the composition. Note that the flow straightening wall 51 is for blocking the flow of the etching gas to form a gas pool, so that the lower edge thereof is formed in a straight line so as to be parallel to the upper surface of the mounting table 3.

  The rectifying wall 51 is made of, for example, a ceramic such as an alumina sintered body, and the height “h” of the upper edge at both end positions on the end side is, for example, 10 mm to 70 mm, the same height as the conventional rectifying wall 171. More preferably, the height is about 30 mm to 50 mm, and the height “h ′” of the upper edge at the highest position in the center is preferably 30 mm to 100 mm, more preferably about 50 mm to 80 mm. Here, the height range of the upper edge is suitable when the length “L” of the rectifying wall 51 is preferably 2 m to 4 m, more preferably 2.5 m to 3.5 m.

  Returning to the overall description of the etching processing apparatus 2, the etching processing apparatus 2 is connected to a control unit 7 as shown in FIG. 1. The control unit 7 includes, for example, a computer including a CPU and a program (not shown). The program is loaded with the substrate S into the processing vessel 20, that is, the operation of the etching processing apparatus 2. A group of steps (commands) for control related to the operation from the etching process to the unloading of the substrate S is assembled. This program is stored in a storage medium such as a hard disk, a compact disk, a magnetic optical disk, or a memory card, and installed in the computer therefrom.

  Hereinafter, the operation of the etching processing apparatus 2 according to the present embodiment will be described. First, when a user selects a desired process recipe for etching processing with respect to the control unit 7 via an operation unit (not shown), the control unit 7 outputs a control signal to each unit of the etching processing apparatus 2 based on the process recipe. Thus, a predetermined etching process is performed on the substrate S. In FIGS. 5A and 5B used for the following description, for convenience of illustration, the description of the support member 52 and each lifting mechanism (the support bar 53, the lifting mechanism 61, the lifting pin 34, etc.) is omitted as appropriate. It is.

  First, as shown in FIG. 5A, prior to loading the substrate S into the processing container 20, each lifting mechanism 61 is operated to raise the support bar 53, and the lower end of the rectifying member 5 is the transport path of the substrate S. The rectifying member 5 is lifted up to a height position where it does not interfere with the standby state. Next, the gate valve 23 is opened, and the substrate S on which the Al film is formed is carried into the processing container 20 by an external conveyance means (not shown) and conveyed to a delivery position above the placement area of the placement table 3. . At this time, as described above, since the rectifying member 5 is configured by the rectifying wall 51 that is difficult to bend, a sufficient gap is secured between the rectifying member 5 and the mounting table 3 to allow the substrate S to pass therethrough. Yes.

  When the substrate S reaches the transfer position, the lift pins 34 are raised to transfer the substrate S from the transfer means to the lift pins 34, and the transfer means that has transferred the substrates S moves out of the processing container 20 and lowers the lift pins 34. Then, the substrate S is placed on the placement area on the placement table 3. Thereafter, the loading / unloading port 22 is closed by the gate valve 23, while each lifting mechanism 61 operates the support rod 53 to place the rectifying member 5 on the mounting table 3.

Next, as shown in FIG. 5B, the vacuum pump is operated to adjust the internal space of the processing vessel 20 to a predetermined pressure, and an etching gas for etching processing, such as chlorine gas, is supplied from the processing gas supply unit 44 described above. Is discharged toward the substrate S. Then, high-frequency power is supplied from the first and second high-frequency power supply units 311 and 312 to the mounting table 3 to form plasma in the space above the substrate S. Based on the main reaction shown in the following formula (1) An etching process is performed on the substrate S.
3Cl ^* + Al → AlCl ₃ (1)

The etching gas supplied from the gas shower head 40 descends in the processing container 20 and reaches the substrate S, and the etching process proceeds on the surface thereof. Then, the etching gas flows along the surface of the substrate S toward the peripheral edge, and the flow is blocked when it reaches the rectifying wall 51 of the rectifying member 5 placed so as to surround the substrate S. When the flow is blocked by the rectifying wall 51, a gas pool region in which the flow rate of the etching gas becomes slow is formed in the inner region of the rectifying wall 51, that is, the peripheral portion of the substrate S, and the etching of the peripheral portion of the substrate S is performed. You can slow down. As a result, the difference in etching rate with the center side of the substrate S is reduced, and the loading effect is suppressed.
At this time, since the flow straightening wall 51 has a structure that is difficult to bend, for example, the flow straightening member 5 is prevented from being placed on the mounting table 3 in a state where the flow straightening member 5 comes into contact with each other.

  The gas pool formed inside the rectifying member 5 eventually overflows the outside of the rectifying member 5 over the rectifying wall 51, passes through the space between the focus ring 33 (mounting table 3) and the processing container 20, and the exhaust path. 24 is exhausted out of the processing vessel 20. After performing the etching process for a predetermined time based on the process recipe in this manner, the supply of the etching gas and the high frequency power is stopped, the pressure in the processing container 20 is returned to the original state, and the order reverse to that at the time of carrying in is performed. Then, the substrate S is transferred from the mounting table 3 to an external transfer means and unloaded from the etching processing apparatus 2 to complete a series of etching processes. When the substrate S is unloaded, the rectifying wall 51 is not easily bent as in the case of loading, so that a sufficient gap for unloading the substrate S is secured between the substrate S and the substrate S. Can be carried out.

  The present embodiment has the following effects. Since the upper edge of the rectifying wall 51 constituting the rectifying member 5 is gradually increased toward the central portion of the rectifying wall 51, for example, in an arch shape, the occurrence of deflection is effective at the central portion where the deflection is maximum. For example, in a region where both ends are not as large as in the central portion, the upper edge of the rectifying wall 51 is set to the same height as that of the conventional rectifying wall 171 so that the rectifying wall 51 can be reduced. It has a configuration that suppresses an increase in the weight. By providing these features, for example, even in the rectifying member 5 arranged around the substrate S having a long side of 2 m or more, the deflection at the central portion of the rectifying wall 51 is reduced, and the substrate S is loaded and unloaded. Can avoid the trouble of colliding with these members. In addition, it is difficult to generate a situation in which the rectifying member 5 is placed on the mounting table 3 in a piece-by-piece state. For example, troubles such as wear, dust generation, and damage due to piece-by-piece are avoided, and the surface is uniform. Etching with good properties can be performed.

  Here, in the present embodiment, when the upper edge of the rectifying wall 51 is formed in a “shape that gradually increases toward the center”, the upper edge of the rectifying wall 51 draws an arc as shown in FIG. For example, when the upper edge of the rectifying wall 51a is changed stepwise as shown in FIG. 6A, or when the rectifying wall 51b shown in FIG. Thus, the case of changing continuously by linear inclination is also included.

  Next, a second embodiment will be described. In the etching processing apparatus 2a according to the second embodiment, as shown in FIGS. 7 and 8, the upper edge of the rectifying wall 51c is directed from the region closer to the center side than both ends of the rectifying wall 51c toward the central portion. The upper edge gradually increases from the region close to the central side toward both ends of the rectifying wall 51c. When viewed as a whole, the upper edge has a rough shape. It has a flat W shape.

  In the method of suppressing the loading by arranging a rectifying member made of a rectifying wall around the substrate S, the present inventors have a correlation between the degree of suppression of loading and the height of the rectifying wall. It is understood that the higher the edge, the higher the loading suppression effect. 14 and 15 and the like, the flow straightening member 17 is manufactured using the elongated rectangular flow straightening wall 171 whose height does not change over the entire side, and the processing in the case where the rectangular substrate S is etched is performed. Looking at the uniformity, it is also known that the etching amount may be larger than the other regions at the center and four corners of each side in the direction along the periphery of the substrate S.

  Based on these findings, when etching is performed using the rectifying wall 51 according to the first embodiment in which the rectifying wall 51 is formed in an arch shape for the purpose of reducing the deflection, each side of the peripheral portion of the substrate S is Since the rectifying wall 51 facing the center is high, the degree of suppression of the loading effect at the position is increased, and the effect of reducing the etching rate is high. On the other hand, in the regions facing the four corners of the substrate S, since the rectifying wall 51 is low, the degree of suppression of the loading effect is relatively low, so that the etching amount at these four corners may remain large.

  Therefore, in the rectifying wall 51c in the second embodiment, the upper edge of the rectifying wall 54 is gradually raised, for example, in an arch shape in the region facing the four corners of the substrate S as shown in FIG. The degree of suppression of loading is increased at both the center and the four corners of the peripheral edge of the substrate, and the etching processing uniformity in the circumferential direction of the peripheral edge of the substrate S can be improved as a whole. In FIG. 7, the same components as those in the etching processing apparatus 2 according to the first embodiment are denoted by the same reference numerals as those shown in FIG.

  In this case, as to how much the central portion and the end portion of the rectifying wall 51c are to be increased over which range, the uniformity of the etching rate in the circumferential direction is determined based on, for example, the simulation of the design stage or the results of preliminary experiments. It is advisable to determine an appropriate shape that can enhance Further, in consideration of the effect of weight due to the provision of a portion having a higher upper edge on the end side of the rectifying wall 51c, the degree of deflection reduction and the increase in the load on the lifting mechanism 61 are evaluated. The shape of the rectifying wall 51c may be determined by trial and error, for example, by changing the shape of the rectifying wall 51c reflecting the evaluation result.

  Next, a third embodiment will be described. In the etching processing apparatus 2b according to the third embodiment, the shape of the rectifying wall 51d constituting the rectifying member 5 is an elongated rectangular shape as in the conventional rectifying wall 171 as shown in FIG. This is different from the rectifying wall 51 according to the first embodiment in which the upper edge is formed in an arch shape. Also, the rectifying wall 51d is different from the first embodiment in that the rectifying wall 51 is composed of a single member in that the rectifying wall 51d is configured by two types of members having different densities.

  FIG. 10 shows a configuration example of the rectifying wall 51d according to the third embodiment. The rectifying wall 51d is, for example, a first rectifier having the same configuration as the rectifying wall 51 according to the first embodiment. A block material 511 and a second block material 512 provided on the first block material 511 and integrally formed with the first block material 511 to form, for example, an elongated rectangular plate material. ing. By increasing the vertical dimension of the first block member 511 at the middle position between the two locations supported by the support member 52, that is, between the both ends of the rectifying wall 51d, the central portion is made difficult to bend. It has a configuration.

  Here, in the second embodiment described above, when the rectifying member 17 adopting the elongated rectangular rectifying wall 171 shown in FIGS. 14 and 15 is used, other parts are provided at the center and four corners of each side of the peripheral portion. It was explained that the etching amount may be larger than the region. However, the rectangular rectifying wall 171 is adopted in an actual apparatus, and it is also true that the in-plane uniformity of the etching process has a sufficient track record of satisfying quality standards. Therefore, in the third embodiment, like the conventional rectifying wall 171, the etching process in the circumferential direction of the peripheral portion of the substrate S is adopted by adopting the rectifying wall 51 d having a constant height over the entire side. The in-plane uniformity is comparable to that of the prior art.

  However, when the first block member 511 and the second block member are simply formed of the same member, there is no difference from the case where the upper edge of the conventional rectifying wall 171 is raised, and the burden on the lifting mechanism 61 is not changed. There is a high possibility that various problems described in the background art, such as deterioration of maintainability due to increase in weight and weight, will become apparent. Therefore, in the third embodiment, the second block member 512 is formed using a member having a lower density than the member constituting the first block member 511, for example, a porous ceramic such as a sintered body of porous alumina. By forming, the increase in the weight of the rectifying wall 51d is suppressed. For example, a porous alumina having a porosity of about 20% to 60%, that is, a density of about 80% to 40% of a normal ceramic is suitable.

  By producing the rectifying member 5 with the rectifying wall 51d having such a configuration and installing it in, for example, the etching processing apparatus 2b having the same configuration as the first embodiment described above, as shown in FIG. As with the rectifying wall that has been conventionally used, the etching process can be performed under the condition that the height of the rectifying wall 51d is constant over the entire circumference of the rectifying member 5, so that the influence of loading is suppressed to the same extent as in the prior art. In addition, the deflection of the rectifying wall 51d can be reduced. In FIG. 9, the same components as those in the etching processing apparatus 2 according to the first embodiment are denoted by the same reference numerals as those shown in FIG.

  Here, in the above-described embodiment, the case where the second block member 512 is formed of a porous ceramic such as porous alumina has been described. However, a member having a low density is not limited thereto. For example, the second block material 512 may be configured by a member in which a normal ceramic is hollowed to reduce the weight.

  Further, the shape of the first block member 511 is not limited to the arch shape shown in FIG. 10, and various shapes illustrated in FIGS. 6A and 6B in the first embodiment are used. The formed member may be the first block member 511, and a second block member may be combined with the first block member 511 to form an elongated rectangular rectifying wall. Furthermore, the shape is not limited to a shape that gradually increases toward the central portion of the first block member 511. For example, in a region near the central portion where the deflection becomes large, such as a rectifying wall 51e shown in FIG. The effect of the present invention can also be obtained by making the central region higher than the end side, such as by forming the upper edge of one block member 511 in a convex shape.

  The rectifying wall according to the present embodiment is not limited to the case where the first block member 511 is disposed on the lower side and the second block member 512 having a low density is disposed on the upper side. For example, FIG. The various rectifying walls 51 and 51a shown in a) and the like may be turned upside down to form the first block member 511, and the rectifying wall in which the second block member 512 is disposed below the member 511 may be used. Furthermore, as shown in FIG. 6B, the first block member 511 is configured such that both the upper edge and the lower edge change, for example, in an arch shape from the end portion toward the center portion. The rectangular block rectifying wall 51f may be formed by joining the second block member 512 to both the upper and lower sides of the block member 511. In addition to these, the rectifying member 51c according to the second embodiment described above is the first block member 511 is also included in the scope of the present embodiment.

  Here, each of the rectifying walls 51c according to the second embodiment and the rectifying walls 51d to 51f according to the third embodiment is a structure for improving the etching uniformity of the peripheral portion of the substrate S. However, the former is a configuration for positively adjusting the uniformity, and the latter is for obtaining the same level of uniformity as the conventional one, and the way of thinking is different. Therefore, which of 51c and 51d to 51f according to each of these embodiments should be adopted is determined based on the peripheral portion of the substrate S when any of the rectifying walls 51c and 51d to 51f is adopted by simulation or preliminary experiment. It is preferable to make a comprehensive determination in consideration of the influence on the load on the lifting mechanism 61, the device cost, etc.

  In the third embodiment, when the substrate S is further enlarged, for example, as shown in FIG. 11C, three or more support members 52 are provided on one rectifying wall 51g. May be. In this case, there is a possibility that the deflection is increased in the central region between the two support members 52 adjacent to each other in the length direction of the rectifying wall 51g. Therefore, the rectifying wall 51g is configured such that the vertical dimension of the first block member 511 is set to be larger than the both sides in the plurality of central regions, thereby reducing the deflection generated in each central region. In addition, the uniformity of etching at the peripheral edge of the substrate S can be maintained at the same level as in the prior art.

  In the first to third embodiments described above, the example in which the rectifying member 5 is configured using four rectifying walls 51 and 51a to 51g of the same type has been described, but different types of rectifying walls 51 and 51a are used. Of course, the straightening member 5 may be configured by combining 51 g.

  Furthermore, the processing apparatus of the present invention is applicable not only to etching treatment of aluminum films, but also to etching of metal films such as aluminum alloys, titanium and titanium alloys, insulating films, semiconductor films, and laminated films thereof. Further, the present invention can be applied to a process for processing an object to be processed using another process gas such as ashing or CVD (Chemical Vapor Deposition) other than the etching process. Further, the process is not necessarily limited to the plasma process, and may be another gas process. Furthermore, the object to be processed is not limited to a square substrate, and may be, for example, a circular semiconductor wafer in addition to an FPD substrate.

It is a longitudinal cross-sectional view which shows the structure of the etching processing apparatus concerning embodiment. It is a top view which shows the structure inside the processing container of the said etching processing apparatus. It is a perspective view which shows the structure inside the said process container. It is a side view which shows the structural example of the baffle wall of the baffle member installed in the said process container. It is a longitudinal cross-sectional view which shows the effect | action of the said etching processing apparatus. It is a side view which shows the modification of the said baffle wall. It is a perspective view which shows the structural example of the etching processing apparatus concerning 2nd Embodiment. It is a side view which shows the structural example of the baffle wall concerning the said 2nd Embodiment. It is a perspective view which shows the structural example of the etching processing apparatus concerning 3rd Embodiment. It is a side view which shows the structural example of the baffle wall concerning the said 3rd Embodiment. It is a side view which shows the modification of the baffle wall concerning the said 3rd Embodiment. It is a longitudinal cross-sectional view which shows the structure of the conventional etching processing apparatus. It is a top view of the board | substrate processed with the said conventional etching processing apparatus. It is a perspective view which shows the structure inside the processing container of the said conventional etching processing apparatus. It is a side view which shows the baffle wall of the baffle member provided in the said conventional etching processing apparatus.

Explanation of symbols

S FPD substrate (substrate)
2, 2a, 2b
Etching processing apparatus 3 Mounting table 4 Upper electrode 5 Rectifying member 7 Control unit 20 Processing vessel 21 Side wall 22 Carry-in / out port 23 Gate valve 24 Exhaust passage 32 Insulating member 33 Focus ring 34 Lifting pin 35 Lifting mechanism 40 Gas shower head 41 Upper electrode base 42 Gas diffusion space 43 Processing gas supply path 44 Processing gas supply part 45 Gas supply holes 51, 51a to 51g
Rectification wall 52 Support member 53 Support bar 61 Elevating mechanism 62 Elevating plate 63 Bellows 171 Rectification wall 172 Protruding part 181 Support bar 511 First block material 512 Second block material

Claims (10)

A mounting table provided inside the processing container for mounting the object to be processed;
A processing gas supply means for supplying a processing gas from the upper side of the mounting table and processing the target object mounted on the mounting table;
A gas exhaust unit for exhausting the gas in the processing container;
A plurality of rectifying walls extending along each side of the object to be processed on the mounting table, and a rectifying member configured to surround the object to be processed;
A support member that supports both ends of the flow straightening wall,
The processing wall, wherein the rectifying wall has an upper edge formed in a shape that gradually increases toward a central portion of the rectifying wall, and a lower edge formed in parallel with the upper surface of the mounting table.   The processing apparatus according to claim 1, wherein an upper edge of the rectifying wall is formed to be continuously higher toward a central portion of the rectifying wall.   The processing apparatus according to claim 2, wherein an upper edge of the rectifying wall is formed in an arch shape.   The processing apparatus according to claim 1, wherein an upper edge of the rectifying wall is formed so as to increase stepwise toward a central portion of the rectifying wall.   The processing apparatus according to claim 1, wherein an upper edge of the rectifying wall is formed so as to gradually increase toward both ends of the rectifying wall. A mounting table provided inside the processing container for mounting the object to be processed;
A processing gas supply means for supplying a processing gas from the upper side of the mounting table and processing the target object mounted on the mounting table;
A gas exhaust unit for exhausting the gas in the processing container;
A plurality of rectifying walls extending along each side of the object to be processed on the mounting table, and a rectifying member configured to surround the object to be processed;
A support member that supports both ends of the flow straightening wall,
The rectifying wall includes a first block member and a second block made of a member having a lower density than a member constituting the first block member on at least one of the upper side and the lower side of the first block member. The processing apparatus is configured by joining materials, and the vertical dimension of the first block material is formed so as to gradually increase toward the central portion of the rectifying wall.   The processing apparatus according to claim 6, wherein the vertical dimension of the first block member is formed so as to increase continuously or stepwise toward a central portion of the rectifying wall.   The processing apparatus according to claim 6 or 7, wherein the first block material is made of ceramic, and the second block material is made of porous ceramic.   9. An elevating mechanism that elevates and lowers the rectifying member between the upper surface of the mounting table and a position above the mounting table by moving the support member up and down. The processing apparatus as described in one.   The processing apparatus according to claim 1, wherein the object to be processed is a rectangular substrate, and the rectifying wall extends along each side of the rectangular substrate.

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