TW202043528A - Process reactor for plasma-enhanced chemical vapor deposition and a vacuum installation using such reactor - Google Patents

Abstract

The present invention provides a process reactor for plasma-enhanced chemical vapor deposition and a vacuum installation using the reactor. The process reactor according to a first embodiment includes a housing; a hollow anode installed in a first part of the housing, which is provided with an orifice for supplying a working gas to a film deposition zone; a cathode installed in parallel with the anode, which can be acted as a second part of the housing; a gas extraction system for extracting gas from the housing; a heating element to maintain a given temperature of the substrate; and a movable substrate carrier placed between the electrodes and configured to contact a substrate along its periphery. The substrate carrier is designed to be installed with a gap between the substrate and the cathode. The two parts of the housing and the anode are configured to perform reciprocating movement independently in a direction perpendicular to the plane of the substrate in the carrier.

Description

Process reactor for plasma chemical vapor deposition and vacuum device using the reactor

The present invention relates to a vacuum process equipment, wherein the deposition of the thin film is performed by a plasma vapor deposition method, and for example, the present invention can be used to form a passivation layer in the process of silicon solar cells.

Within the technical field, the design of plasma chemical vapor deposition reactors is known, for example, as used to complete Oxford Instruments Plasma Technology Co., Ltd. (http://www.plasmasystem.ru/technology/pecvd) The installation of the device is described by the equipment. This type of reactor usually uses high-frequency capacitive discharge plasma to start the deposition process. Plasma is generated between two parallel electrodes. One of the electrodes is a cathode at ground potential, while the second electrode (that is, the anode) is applied with a high-frequency voltage. The substrate is fixed on the cathode, which can be heated to the temperature required during the deposition process. The cavity gas distributor is arranged in the anode to supply and distribute the gas mixture to the discharge area (that is, the processing area). The reactor housing includes channels for discharging plasma chemical reaction products.

Plasma chemical vapor deposition reactors for deposition on one wafer or more wafers are also known [2]. This type of reactor includes a shell with a movable cover, in which the upper part has an anode, which consists of a horizontal support plate with a gas distributor fixed on it. The reactive gas is supplied by the anode to the area where the substrate is processed, and the area is positioned by the wall of the fixed housing. At least one ground node of the high-frequency current is connected to at least one wall of the positioning processing area of the housing. The planar substrate is fixed under its own weight and without additional support on the horizontal cathode configured to move vertically. A shadow frame covering the edge of the substrate is provided on the upper surface of the substrate. The carrier (ie, the cathode) of the substrate may include heating and/or cooling elements for maintaining a given temperature of the substrate. The gas distributor system of the reactor is made in the form of channels in the horizontal support plate for supplying the reaction gas to the internal cavity of the anode and the orifice of the gas distributor. The reactor shell has a channel for pumping out plasma chemical reaction products.

The disadvantage of the reactor described above is that the flat substrate is located on the carrier, that is, on the cathode. The greatest contact between the working surface of the wafer and the carrier can cause mechanical damage to the wafer and promote the intrusion of contaminants. In the subsequent film forming process, such shortcomings may not be eliminated or completely eliminated. The described design of the reactor allows the film to be applied only on the flat upper side of the substrate, while the processing of the second side is only possible after the substrate is turned over. Turning and transportation operations can also be sources of contaminants and defects.

The process reactor used for plasma chemical vapor deposition has parallel opposed electrodes, one of which is a carrier of a planar substrate, which is described in many patent documents [3, 4, 5]. In addition to the description of the design of the process reactor, these patent documents also include a description of the vacuum device used in the plasma chemical reactor for industrial deposition of various thin films (including the manufacture of thin-film photovoltaic cells) on flat substrates.

The technical solution closest to the required vacuum device and process reactor is a device for plasma chemical vapor deposition on a large-size flat substrate [6]. The vacuum device consists of at least two vacuum chambers with one chamber located in the other chamber. In this case, the inner chamber acts as a process reactor in which the deposition of the film takes place. The lower part of the reactor shell is configured to be vertically movable to open/close the reactor when loading and unloading the substrate.

The use of several process reactors in the described vacuum device makes it possible to realize a flexible operation sequence in a single process cycle, and to exclude the mutual influence of processing areas during the deposition process, but does not exclude the process reactor Cross contamination during opening and closing. The disadvantage of the described design lies in the deposition of the layer on one side of the substrate in one vacuum cycle; and the fact that during loading into the process reactor, the transport of the substrate is carried out using a holding rod with a lift system, The elevator system is used to lift the substrate and lower it to the cathode located in the lower part of the process reactor housing, which causes mechanical defects on its working surface. For the subsequent thin film on the back of the substrate, the pressure of the vacuum device and the inversion of the substrate in the atmosphere are required. When the substrate is in the atmosphere, an oxide can be formed on its surface that will reduce the quality of the subsequently formed layer.

The technical problem to be solved by the patentable invention is to provide a vacuum device with a process reactor for plasma chemical vapor deposition of thin films. The design of this reactor makes it possible to apply thin films on both sides of a flat substrate without turning it over; to minimize the contact between the substrate and the carrier to reduce mechanical defects and contamination to the substrate during processing; and Provides an overall improvement in the quality of substrate processing and eliminates other shortcomings known in the prior art.

[Prior Technical Literature] [Non-Patent Literature] http://www.plasmasystem.ru/technology/pecvd [Patent Literature] Patent Document 1: US8728918, published on May 20, 2014. Patent Document 2: US2011171774, the publication date is July 14, 2011. Patent Document 3: US2006005771, the publication date is July 12, 2006. Patent Document 4: US2013171757, the publication date is July 04, 2013. Patent Document 5: EP1953794, the publication date is February 1, 2012.

The problem to be solved is solved by the following facts: According to the first embodiment of the present invention, a process reactor for plasma chemical vapor deposition of thin films on flat substrates includes: a disassembly consisting of two parts A hollow anode mounted in the first part of the part of the casing, the hollow anode is configured to be applied with a high frequency voltage and provided with an orifice for supplying working gas to the film deposition zone, A cathode installed in parallel with the hollow anode, which serves as the second part of the part of the casing, and a gas extraction system to maintain a given temperature of the substrate and a heating element placed between the electrodes and configured to The mobile substrate carrier whose periphery contacts the substrate, the contact area is less than 0.5% of the substrate area, and is designed to be installed in a way that the substrate has a gap with the cathode, the gap is less than the high-frequency capacitance formed between them The distance required for discharge, wherein the two parts of the housing and the anode are both configured to perform a separate reciprocating movement in a direction perpendicular to the plane of the substrate in the carrier.

In addition, the anode of the process reactor includes the discharge excitation electrode and a shielding case, the shielding case covers the excitation electrode and is installed with a gap of no more than 2 mm relative to the excitation electrode, and the substrate carrier is designed to Mount the substrate with a gap of no more than 2 mm relative to the cathode.

The gas extraction system includes an extraction distributor arranged in the first part of the housing along its circumference, and the heating element is positioned in the two parts of the housing.

The problem to be solved is solved by the following facts: According to the second embodiment of the present invention, a process reactor for plasma chemical vapor deposition of thin films on flat substrates includes: a two-part disassembly Type sealed housing; the first hollow anode and the second hollow anode are installed in parallel with each other in the first part and the second part of the part of the housing, each of which is configured to be A high-frequency voltage is applied and is provided with an orifice for supplying working gas to the film deposition area, and a gas extraction system for extracting the gas from the housing, a heating element to maintain a given temperature of the substrate, and a heating element placed on the electrode The movable substrate carrier is configured to contact the substrate along its periphery, the total contact area is less than 0.5% of the substrate area, and is designed for mounting the substrate with a gap with respect to the electrode, wherein the shell Both parts of the body and the electrode are configured to perform independent reciprocating movements in a direction perpendicular to the plane of the substrate in the carrier.

As in the first embodiment of the present invention, the anode of the process reactor includes an excitation electrode for high-frequency capacitive discharge and a shielding case. The shielding case covers the excitation electrode and is separated from the excitation electrode with a gap of no more than 2 mm. Installation, the gas extraction system includes an extraction distributor arranged in the first part of the housing along its circumference, and the heating element is positioned in the two parts of the housing. .

The problem to be solved is also solved by the following facts: a vacuum device for plasma chemical vapor deposition of thin films on flat substrates, which includes: a sealed vacuum corridor in which at least one The process reactor of the embodiment and/or the two process reactors according to the first embodiment, a transport system for moving a carrier with a substrate in a vacuum corridor, and a gas extraction system for extracting gas from the vacuum corridor, The system is configured to maintain a pressure less than the operating pressure in all the process reactors.

If two or more reactors are placed in the vacuum corridor, a gas valve or a mechanical vacuum door separates them from each other. In addition, auxiliary heating elements are installed in the vacuum corridor to maintain a given substrate temperature.

The process reactor as shown in FIG. 1 includes a detachable shell composed of two movable parts: a locking shell 1 and a locking electrode 2, wherein an anode is placed in the locking shell 1. The anode includes: an electrode 3 to excite plasma in the processing area 4; a shielding shell 5 designed to locate high-frequency energy and prevent parasitic discharge; and a gas distributor 6 having an orifice, the orifice It is used to supply and distribute process gas in the thin film deposition area (that is, the processing area 4). The anode is configured to move back and forth in the first part of the process reactor housing (that is, in the lock housing 1). The gap between the excitation electrode 3 and the shielding shell 5 does not exceed 2 mm. The increase of the gap will cause the occurrence of parasitic discharge between the electrode and the shielding case. As a result, a portion of the input power is dissipated in uncontrolled random "parasitic" processes that undermine the stability of chemical reactions in the processing zone, the stoichiometry and uniformity of the layers formed.

The second movable part (locking electrode 2) of the process reactor housing is the cathode at ground potential.

Under the operating conditions of the process reactor, both parts of the shell are tightly closed and form a barrier to the gas propagation from the process reactor.

A movable carrier 7 is installed between the parallel electrodes 3 and 2, on which carrier the planar substrate 8 is held parallel to the electrodes. Structurally, the carrier 7 is made in the form of a frame, so that all surfaces of the substrate are open for processing, and the substrate itself is held by a frame flange protruding inward, so that the contact area between the substrate and the carrier does not exceed the substrate 0.5% of the area. The flange can be realized along the entire circumference of the frame or at several locations, and hold the wafer along the entire circumference or at some points, respectively.

The width of the processing zone 4 is controlled by the movement of the anode relative to the substrate 8, thereby controlling the adjustment of the uniformity of deposition in the process reactor.

The locking electrode 2 is close to the back of the substrate 8, but does not touch it. When processing a certain surface of the substrate, the opposite surface that is not processed is located at a distance of no more than 2 mm from the locking electrode 2. In this case, the gap width between the locking electrode 2 and the substrate 8 is less than the distance that can form a high-frequency capacitive discharge under a pressure of less than 500 Pa. Therefore, the film is only positioned on the anode side of the substrate. On the surface.

The heating element 9 of the lock housing 1 and the heating element 10 of the lock electrode 2 designed to generate the working temperature in the processing zone 4 and maintain the inner surface temperature of the process reactor are positioned in the lock housing 1 and the lock electrode 2 respectively Inside. Because the chemical reaction in the unheated area causes the formation of highly dispersed particles, and their presence increases the number of defects in the formed film, uniform heating of the entire internal area of the reactor for the manufacturing process of high-quality film is necessary .

In order to transport the gas reagent to the processing area 4, a working gas supply channel 11 is provided. The working gas is supplied into the inner cavity 12 of the excitation electrode 3 through the air passage, and later, the working gas enters the processing area 4 through the holes in the gas distributor 6.

The gas extraction system for extracting the gas in the process reactor to exhaust the plasma chemical reaction products includes an extraction distributor 13. The extraction distributor is arranged in the lock shell 1 of the reactor along its circumference, and aims to uniformly discharge the reaction gaseous products from the process reactor through the extraction channel 14 built in the lock shell 1.

As shown in Figure 2, a process reactor with two anodes may be installed. In a process reactor with two anodes, the mobile carrier 7 of the substrate 8 during the technical process is fixed between the two anodes (for example, between the two movable parts of the housing), and between the two anodes. The electrode is in a plane parallel to the surface of the gas distributor.

In this embodiment of the process reactor, the gaseous reagent is transported to the two processing zones through each anode, and the two movable parts of the housing include gas extraction systems with extraction distributors and channels.

As shown in Figure 2, the vacuum device (where a process reactor with two anodes is used) for manufacturing thin films on both sides of a planar substrate in one vacuum cycle includes at least one lock chamber (not shown in the drawings) and At least one plasma chemical vapor deposition process reactor located in the vacuum corridor 15. The movement of the substrate 8 from the moment when it is loaded into the vacuum device to the moment when it is unloaded is performed by a transfer system (not shown in the drawings) on which a movable carrier 7 having the substrate 8 is mounted.

The vacuum device has a differential extraction system: the process reactor is extracted with its built-in extraction system. For this reason, the reactor contains a separate extraction channel 14 with an extraction distributor 13, and the gas flows from the vacuum corridor 15 through the extraction system of the vacuum corridor. The extraction channel 16 sucks. At this time, the pressure P1 in the vacuum corridor 15 is maintained lower than the pressure P2 in the process reactor. Under this condition, the gas penetrates into the vacuum corridor through the sealant, and due to the degassing of the inner surface of the vacuum corridor, it is generally extracted and discharged by the vacuum corridor, and no gas medium component in the processing area 4 is applied. influences. Therefore, since the concentration of undesirable gaseous impurities such as water, oxygen, and nitrogen vapor is reduced, the reproducibility of the process is improved and the quality of the film is improved.

Under the operating conditions of the process reactor, parts of the shell are tightly closed and form a barrier to the gas flow, resulting in at least an order of magnitude difference between the volumes to be divided.

As shown in Figure 3, a vacuum device using at least two process reactors (each with an anode) also allows alternate formation of thin film layers on both sides of the substrate in one vacuum cycle without turning over between operations Substrate. In this case, the transport system moves the substrate in the carrier between process reactors.

In order to reduce the interaction between the process reactors during the deposition process, and thereby ensure the purity of the process in the vacuum device, the process reactors can interact with each other in the vacuum corridor through a valve or a mechanical vacuum door.

Because temperature is one of the main parameters of the process, its changes cause exponential changes in the deposition rate and changes in the stoichiometry and structure of the formed thin film, so the existence of the heating element enables the temperature of the wafer to be set and maintained within the required range . In a patentable vacuum device, an additional arrangement of heating elements 17 (as shown in Figure 3) for substrate temperature is possible. The substrate temperature is determined by the process or the heating position in the vacuum corridor outside the process reactor. The manufacturing process in the lock room is predetermined.

Industrial availability

Example 1

A vacuum device (shown in Figure 3) with two process reactors (each with an anode) operates as follows.

The flat substrate 8 is placed on the frame carrier 7. Later, the frame carrier 7 is installed on the transfer system of the vacuum device and loaded into the lock chamber. The lock chamber and the vacuum corridor are drawn out, among which, around the process reactor located in the vacuum corridor, the extraction system is set for a pressure P1 not exceeding 10 Pa. The mechanical vacuum door connecting the lock chamber and the vacuum gallery is opened, and the transport system moves the carrier 7 together with the substrate 8 into the vacuum gallery 15 and closes the vacuum door.

Then, the carrier 7 with the substrate 8 is moved to the position where the thin film is deposited on the front surface of the planar substrate in the first process reactor. At the same time, the process reactor is in the transfer position, that is, it is opened, and the movable part of the housing (locking housing 1, locking electrode 2) is moved apart. By installing the carrier 7 in the deposition position, the process reactor is closed: that is, the locking shell 1 and the locking electrode 2 are pressed against the carrier 7, so that the locking electrode leaves the smallest gap close to the substrate 8, but does not touch it . The existence of the gap prevents mechanical contact between the back of the substrate and the process reactor components, thereby preventing damage to the substrate surface and improving the characteristics of the formed layer.

The heating elements 9 and 10 set to heat the substrate 8 to a temperature preset by the process conditions are turned on. In order to perform the deposition process after reaching a given temperature, a working gas mixture with a controlled flow rate and composition is supplied to the process reactor through the orifice of the gas distributor 6 in the anode 3 through the working gas supply channel 11 District 4. After reaching the given operating pressure and temperature, the high-frequency generator is turned on. A high-frequency capacitive discharge plasma is generated in the processing area 4, and the deposition process starts. The uniformity of the deposition in the process reactor is adjusted by controlling the width of the plasma forming area, which is equal to the distance between the anode and the surface of the substrate 8 facing the anode. With a special drive with a servo motor (not shown in the figure), the width of the plasma formation area can be adjusted in the range of 8 mm to 50 mm.

Because the width of the gap between the locking electrode 2 and the back surface of the substrate 8 is less than the distance that can be formed by high-frequency capacitive discharge under a pressure environment of less than 500 Pa, the film is only deposited on the anode-facing surface of the substrate.

In the deposition mode, gas is extracted from the processing zone 4 by the extraction sparger 13, and the gas enters the extraction channel 14 of the process reactor from the extraction sparger 13.

After the deposition process is completed, the process reactor is opened, that is, it is moved to the transfer state. To achieve this, the lock housing 1 and the lock electrode 2 are vertically moved in opposite directions to each other, so that the carrier 7 becomes empty.

At the transport position of the process reactor, the gas is extracted through both the extraction channel 14 of the process reactor and the extraction channel 16 of the vacuum corridor 15.

When the first reactor is in the transport position, the carrier 7 is moved by the transport system to the next process reactor that is also in the transport position at this time, and the substrate 8 with the film applied on its front surface is positioned in the carrier. In the second reactor, the anode is positioned on the back surface of the flat substrate, so the working gas and high-frequency power are supplied to the processing area 4 from the direction of the back surface of the substrate. The film deposition on the back of the substrate is performed in the same way as in the first reactor.

From the second process reactor, the substrate with the thin films deposited on its two surfaces is unloaded from the vacuum corridor through the vacuum door to the lock chamber by a transfer system, and further transferred according to the production cycle.

Example 2

As shown in Figure 4, the patentable vacuum device may be equipped with three process reactors. For example, this device can be used for the passivation layer application of heterogeneous silicon solar cells.

In a first reactor with two anodes in a vacuum device with three process reactors, simultaneous passivation treatment on both sides of the silicon wafer with a hydrogenated amorphous silicon layer is performed. In the second and third reactors with one anode, p-type or n-type conductive hydrogenated amorphous or microcrystalline silicon doped layers are alternately applied on the front and back of the wafer without turning over.

The vacuum device for applying the passivation layer of heterogeneous silicon solar cells with three process reactors operates as follows.

When the first reactor with two anodes in the process flow is in the transfer position, the transfer system moves the substrate 8 (that is, the n-type conductive silicon wafer) to the deposition position. In order to move the silicon wafer by the transfer system, a flat frame carrier is used, which is designed to provide a carrier-substrate contact area with an area of less than 1 cm² on one side of the silicon wafer. Because the total area of the silicon wafer is 156×156 mm, the carrier-substrate area is less than 0.5% of the total area of the silicon wafer. In this case, the design of the carrier sets the possibility of processing silicon wafers from any side.

Turn off the reactor. For this purpose, the carrier 7 is tightly closed by the two locking shells 1. In the processing zone 4, the extraction system of the process reactor provides a pressure of 400 Pa. Turn on the heating elements 9, 10 to heat the silicon wafer to 200 degrees Celsius. After the temperature reaches the steady state mode, in order to perform the deposition process by the anode, the working gas mixture is supplied to the two processing areas 4 respectively. The working gas mixture is composed of silane (SiH ₄ ) and hydrogen (H ₂ ), with controlled Composition and controlled flow rates of 90 cm³/min and 9 cm³/min. For each anode of the reactor, a 60-watt high-frequency generator is connected to generate a high-frequency capacitive discharge plasma in the processing zone 4, and the intrinsic conductive hydrogenated amorphous silicon layer is deposited during 20 seconds Process.

The adjustment of the deposition uniformity in the process reactor is achieved by controlling the distance between the anode and the surface of the silicon wafer.

In the deposition mode, the gas extraction from the two processing zones 4 is performed by the extraction distributor 13, and the gas enters the extraction channel 14 provided in each lock housing 1 from the extraction distributor 13.

After the deposition process is completed, the first process reactor is moved to the transfer position. For this purpose, the two locking shells 1 together with the anode are moved in opposite directions, so that the carrier 7 becomes empty.

When the first process reactor is in the transfer position, the carrier 7 with the substrate 8 is moved to the next process reactor that has an anode and is also in the transfer position by the transfer system. If both process reactors are in the transfer position, the extraction system and the vacuum corridor extraction system of each process reactor are in operation: that is, the gas is extracted through the extraction channels 14 and 16.

In the second reactor, working gas and high-frequency power are supplied to the processing area on the front surface of the silicon wafer. In this process, a p-type conductive hydrogenated amorphous silicon layer is applied on the front side of the silicon wafer. In this case, the following process parameters remain unchanged: pressure is 400 Pa, silane flow rate is 10 cm³/min, hydrogen flow rate is 300 cm³/min, diborane (B ₂ H ₆ ) flow rate is 50 cubic meters Cm/min, high-frequency power input is 60 watts, wafer temperature is 200 degrees Celsius, and deposition time is 40 seconds.

After the process of applying the film layer is completed, the second process reactor is moved to the transfer position, and the transfer system moves the substrate 8 with the applied film to the next third process that is opened at this time (that is, it is in the transfer position) reactor. Later, the second and third reactors were closed, and in the third process reactor, the n-type conductive hydrogenated amorphous silicon layer was applied on the back of the silicon wafer under the following process parameters: the pressure was 400 Pa, The flow rate of silane is 10 cm³/min, the flow rate of hydrogen is 300 cm³/min, the flow rate of phosphorus (PH ₃ ) is 15 cm³/min, the high-frequency power input is 60 watts, the sample temperature is 200 degrees Celsius, deposition The time is 30 seconds.

From the third process reactor, the silicon wafer with the thin film applied on both sides is unloaded from the vacuum corridor of the vacuum chamber by the transfer system, and further transferred according to the production cycle.

Since one of the main goals of hydrogenated amorphous silicon deposition in the manufacture of solar cells is to reduce the surface state density due to the passivation of surface defects, the effective carrier lifetime can be used to evaluate the quality of the passivation layer. Figure 5 shows the comparison of the luminescence spectra of silicon wafers after passivation with a self-hydrogenated silicon layer with a thickness of 20 nm. Figure 5a shows the silicon wafer produced on the plasma chemical vapor deposition unit implemented according to the standard model. Figure 5b shows a silicon wafer with hydrogenated amorphous silicon layers on two planes produced on a patentable vacuum device with a patentable reactor. On the emission spectrum of the first sample, "black bars" can be seen, which proves the damage of the silicon wafer caused by the robot during the loading/unloading process and the point defects caused by the dust particles between the sample and the carrier.

The effective carrier lifetime obtained in a patentable device is more than 3.5 times that of a device using a standard process flow and wafer flipping in a similar state. This setting is used to roughly increase the fill factor (FF) by 3~4% and increase the solar cell efficiency by 1.1~1.5%.

Therefore, the improved design of the vacuum device with a process reactor for plasma chemical vapor deposition of thin film layers is set up for: thin film application on both sides of a flat substrate without turning over, reducing mechanical defects, and reducing substrate contamination , Generally improve the quality of substrate processing and improve the technical characteristics of the resulting thin film structure.

These independent technical achievements are obtained for the following reasons.

According to the requirements of the process, the thin film structure in the vacuum device using the patentable plasma chemical reactor can be alternately or simultaneously formed on both the top and bottom of the substrate.

The substrate is placed in the carrier during all processing stages. The carrier has the smallest area in contact with the surface of the substrate and does not affect the central working parts of the substrate, which can reduce the mechanical defects and pollution of the substrate.

The design of the process reactor and the design of the vacuum device including such a reactor allows all stages of forming a thin film structure to be performed without turning the substrate.

Several process reactors can be placed in a vacuum corridor of the vacuum device. The design of the reactor and the design of the vacuum device make it possible to control the operating pressure in the reactor and the vacuum corridor of the vacuum device. Therefore, the reactor will Operate independently, and have no influence on the processes taking place in each reactor.

For example, for silicon solar cells manufactured using the above-mentioned vacuum device, the improved technical characteristics are the increase in the effective carrier lifetime after the silicon wafer is passivated. As a result, heterojunction solar cells will have higher efficiency.

1: Lock the shell 2: Lock electrode 3: electrode 4: Processing area 5: Shielding shell 6: Gas distributor 7: Carrier 8: substrate 9, 10, 17: heating element 11: Working gas supply channel 12: Internal cavity 13: Pull out the distributor 14, 16: draw out the channel 15: Vacuum corridor

The drawings show the essence of the invention. Figure 1 shows a diagram of a process reactor with one anode; Figure 2 shows a diagram of a process reactor with two anodes; Figure 3 shows a diagram with two processes each including one anode Diagram of the vacuum device of the reactor; Figure 4 shows a diagram of the vacuum device with three process reactors including different numbers of anodes; Figure 5 shows the photoluminescence intensity distribution of the solar cell: a) According to Manufactured by standard plasma chemical vapor deposition equipment, b) manufactured according to patentable vacuum equipment.

When characterizing any vacuum device, all component symbols describing the components of a certain reactor used in it are specified in Figures 1 and 2.

1: Lock the shell

2: Lock electrode

3: electrode

4: Processing area

5: Shielding shell

6: Gas distributor

7: Carrier

8: substrate

9, 10: heating element

11: Working gas supply channel

12: Internal cavity

13: Pull out the distributor

14: Pull out the channel

Claims (13)

A process reactor for plasma chemical vapor deposition, which includes: A detachable sealed housing composed of two parts, a hollow anode installed in the first part of the part of the housing, the hollow anode configured to be applied with a high frequency voltage and provided with a The gas is supplied to the orifice of the thin film deposition zone, the cathode installed in parallel with the hollow anode, the cathode serving as the second part of the part of the casing; and A gas extraction system for extracting gas from the housing, a heating element to maintain a given temperature of the substrate, and a movable substrate carrier placed between the electrodes and configured to contact the substrate along the periphery thereof, the contact area Less than 0.5% of the area of the substrate, and it is designed to be installed in a way that the substrate has a gap relative to the cathode, the gap being less than the distance required to form a high-frequency capacitive discharge between them; Wherein, the two parts of the casing and the anode are both configured to perform independent reciprocating movement in a direction perpendicular to the plane of the substrate in the carrier. The process reactor according to claim 1, wherein the anode includes the discharge excitation electrode and a shielding case, and the shielding case covers the excitation electrode and has a ratio of no more than 2 relative to the excitation electrode. A gap of mm is installed. The process reactor according to claim 1, wherein the substrate carrier is designed to mount the substrate with a gap of not more than 2 mm with respect to the cathode. The process reactor according to claim 1, wherein the gas extraction system includes an extraction distributor arranged in the first part of the casing along its circumference. The process reactor according to claim 1, wherein the heating element is positioned in two parts of the housing. A process reactor for plasma chemical vapor deposition, which includes: Detachable sealed housing composed of two parts; A first hollow anode and a second hollow anode respectively installed in the first part and the second part of the part of the housing in parallel to each other, each of which is configured to be applied with a high-frequency voltage And provided with orifices for supplying working gas to the thin film deposition area; and A gas extraction system for extracting gas from the housing, a heating element to maintain a given temperature of the substrate, and a movable substrate carrier placed between the electrodes and configured to contact the substrate along its periphery. The area is less than 0.5% of the area of the substrate, and is designed for mounting the substrate with a gap with respect to the electrode; Wherein, the two parts of the housing and the electrode are both configured to perform independent reciprocating movement in a direction perpendicular to the plane of the substrate in the carrier. The process reactor according to claim 6, wherein each of the anodes includes an excitation electrode for high-frequency capacitive discharge and a shielding case, and the shielding case covers the excitation electrode and is opposite to the excitation The electrodes are installed with a gap of no more than 2 mm. The process reactor according to claim 6, wherein the gas extraction system includes an extraction distributor arranged in the first part of the casing along its circumference. The process reactor according to claim 6, wherein the heating element is positioned in two parts of the housing. A vacuum device for plasma chemical vapor deposition, which includes: A sealed vacuum corridor, in which at least one process reactor as claimed in claim 6 and/or two process reactors as claimed in claim 1 are positioned, for moving a carrier with a substrate in the vacuum gallery Transmission system; and A gas extraction system for extracting gas from the vacuum gallery, the system is configured to maintain a pressure less than the operating pressure in all the process reactors. The vacuum device according to claim 10, wherein, if two or more reactors are placed in the vacuum corridor, a valve separates them from each other. The vacuum device according to claim 10, wherein if two or more reactors are placed in the vacuum corridor, a mechanical vacuum door separates them from each other. The vacuum device according to claim 10, wherein an auxiliary heating element is installed in the vacuum corridor to maintain a given substrate temperature.

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