CN111850518A - Tray preheating cavity and corresponding PECVD equipment - Google Patents
Tray preheating cavity and corresponding PECVD equipment Download PDFInfo
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- CN111850518A CN111850518A CN202010704046.7A CN202010704046A CN111850518A CN 111850518 A CN111850518 A CN 111850518A CN 202010704046 A CN202010704046 A CN 202010704046A CN 111850518 A CN111850518 A CN 111850518A
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- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 title claims abstract description 79
- 238000012546 transfer Methods 0.000 claims abstract description 60
- 238000000034 method Methods 0.000 claims abstract description 59
- 230000008569 process Effects 0.000 claims abstract description 59
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 25
- 239000010703 silicon Substances 0.000 claims abstract description 25
- 229910021417 amorphous silicon Inorganic materials 0.000 claims abstract description 19
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 12
- 238000003860 storage Methods 0.000 claims description 60
- 235000012431 wafers Nutrition 0.000 claims description 19
- 238000005192 partition Methods 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000000151 deposition Methods 0.000 claims description 7
- 239000011261 inert gas Substances 0.000 claims description 6
- 230000008021 deposition Effects 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 claims description 2
- 230000003993 interaction Effects 0.000 claims description 2
- 238000009740 moulding (composite fabrication) Methods 0.000 claims 1
- 239000010409 thin film Substances 0.000 description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000010408 film Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910021419 crystalline silicon Inorganic materials 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/46—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for heating the substrate
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/50—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges
- C23C16/513—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges using plasma jets
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention provides a tray preheating cavity and a corresponding PECVD device. The PECVD equipment comprises: a loading module for placing the silicon wafer in a tray; a tray transfer module for transferring the tray transferred by the loading module to the tray preheating chamber and receiving the preheated tray; the tray preheating cavity is used for receiving and preheating the trays to a preset preheating temperature and returning the trays to the tray transferring module; a loading chamber configured to receive the preheated tray transferred by the tray transfer module; the PECVD process cavity receives the tray conveyed by the loading cavity and deposits and forms an I/N or I/P type amorphous silicon film on one surface of the silicon wafer carried by the tray through intrinsic and doping PECVD processes; an unloading chamber receiving a tray transferred by the PECVD process chamber; and an unloading module which receives the tray transferred by the unloading chamber and unloads the silicon wafer from the tray. The invention can effectively improve the productivity, preheating flexibility and preheating efficiency of the equipment and can effectively reduce the cost of the equipment.
Description
Technical Field
The invention relates to the field of solar cell manufacturing, in particular to a tray preheating cavity and corresponding PECVD equipment.
Background
The thin film/crystalline silicon heterojunction solar cell (hereinafter referred to as heterojunction solar cell, also called HIT or HJT or SHJ solar cell) belongs to the third generation high-efficiency solar cell technology, combines the advantages of crystalline silicon and a silicon thin film, has the characteristics of high conversion efficiency, low temperature coefficient and the like, and is one of the important development directions of high-efficiency crystalline silicon solar cells. Particularly, the conversion efficiency of the double-sided heterojunction solar cell can reach more than 26%, and the double-sided heterojunction solar cell has wide market prospect.
The existing process for manufacturing a heterojunction solar cell has higher requirements on the temperature of a silicon wafer, for example, the temperature of the silicon wafer is required to reach more than 200 ℃ when the PECVD process is carried out in Plasma Enhanced Chemical Vapor Deposition (PECVD) equipment, and the temperature of the tray and the silicon wafer thereon is not high enough when the tray and the silicon wafer thereon enter the PECVD equipment, so that the corresponding PECVD process can be carried out only after the tray and the silicon wafer stay in the PECVD equipment for a long time to reach the ideal temperature, thus the production time is seriously influenced, and the productivity of the PECVD equipment is too low. If the tray preheating process can be placed at the periphery of the PECVD equipment, the production time of the equipment can be shortened, and the equipment cost can be reduced.
Therefore, how to provide a tray preheating chamber and a PECVD apparatus to improve the heating capability of the preheating chamber, increase the productivity of the apparatus, and reduce the cost of the apparatus has become an urgent technical problem to be solved in the industry.
Disclosure of Invention
In view of the above problems in the prior art, the present invention provides a tray preheating chamber for interaction of trays with a tray transfer module disposed outside the tray preheating chamber and for preheating of the trays, the tray preheating chamber including: a cavity provided with a first connector; the tray preheating module is arranged in the cavity and comprises a second connecting piece, a storage frame and a plurality of layers of preheating units, wherein the second connecting piece is used for being longitudinally movably connected to the first connecting piece, the storage frame is fixedly connected to the second connecting piece, the plurality of layers of preheating units are longitudinally overlapped in the storage frame, and each layer of preheating unit comprises a partition plate, a heater and a driven roller set which are sequentially arranged along the longitudinal direction; the longitudinal driving module is used for driving the second connecting piece to longitudinally move relative to the first connecting piece so as to drive the storage frame to longitudinally move in the cavity; a driving wheel module adjacent to the storage frame and arranged at two sides of the driven roller group, wherein the driving wheel module is provided with a tray driving position for driving the tray to move on the driven roller group and a waiting position for waiting calling and not blocking the storage frame from moving up and down, and the driving wheel module extends into a selected unit of the preheating units at the tray driving position, and receives and drives the tray to be in place or out of place on the selected driven roller group of the selected unit to enter the tray transfer module; and the control module is configured to control the longitudinal driving module to drive the storage frame to move longitudinally so that the selected unit is aligned with the tray transferring module, when a tray is transferred into the selected unit from the tray transferring module or is reversely transferred out, the control module controls the driving wheel module to enter the tray driving position, carry and drive the tray to be in place or out of place on the selected driven roller set, and controls the driving wheel module to retract to the waiting position after the tray is in place or out of place, and the control module also controls a heater of the preheating unit bearing the tray to heat in a nitrogen or inert gas atmosphere so as to maintain the temperature of the tray at a preset preheating temperature.
In an embodiment, the first connecting member and the second connecting member both form a ball screw, and the longitudinal driving module is a stepping motor for driving the second connecting member to move longitudinally relative to the first connecting member.
In an embodiment, the first connecting piece is a lead screw rod which is longitudinally arranged in the cavity and supported by a bearing, the second connecting piece is a lead screw nut matched with the lead screw rod, the storage frame is fixedly connected to the lead screw nut, a guide rail for accommodating the storage frame to longitudinally advance in the storage frame is arranged on the outer side of the storage frame, and the longitudinal driving module drives the storage frame to move up and down along the guide rail.
In one embodiment, the partition, the heater and the driven roller group of each layer of preheating unit are fixedly connected to the storage frame in the order from bottom to top, and a storage space for accommodating the tray is provided between each driven roller group and the adjacent partition of the adjacent layer.
In one embodiment, the preset preheating temperature is in a range of 40-250 ℃.
In one embodiment, the heater is a plurality of infrared heating lamp tubes, the partition is configured to reflect more than 90% of infrared light emitted by the infrared heating lamp tubes, and the control module can control the heater of each preheating unit in the plurality of preheating units to independently heat.
In one embodiment, the driving wheel module comprises a driving roller group for driving the tray, a first driving module for driving the driving roller group to horizontally stretch and retract so as to move between a tray driving position and a waiting position, and a second driving module for driving the driving roller group to rotate so as to drive the tray to horizontally move, wherein the first driving module and the second driving module are both arranged outside the cavity.
In one embodiment, the control module, when transferring the tray to be preheated from the tray transfer module to the selected unit, is configured to: the longitudinal driving module is controlled to drive the storage frame to longitudinally move to a position where the conveying surface of the selected driven roller group is aligned with the conveying surface of the tray transferring module, the first driving module is controlled to drive the driving roller group to extend into the selected unit and enter the tray driving position after the aligned position is reached, the second driving module is controlled to drive the driving roller group to rotate after the tray driving position is reached, so that the tray is driven to be in place on the selected driven roller group, and the longitudinal driving module is controlled to drive the storage frame to upwardly move for a preset distance after the tray is in place, so that the first driving module is controlled to drive the driving roller group to be retracted to the waiting position without hindrance.
In one embodiment, the control module, when transferring the preheated tray from the selected cell to the tray transfer module, is configured to: the longitudinal driving module is controlled to drive the storage frame to longitudinally move to a position where the conveying surface of the selected driven roller group is higher than the conveying surface of the tray transferring module by a preset distance, the first driving module is controlled to drive the driving roller group to extend into the selected unit and enter the tray driving position after the position is reached, the longitudinal driving module is controlled to drive the storage frame to downwards move by the preset distance after the tray driving position is entered, then the second driving module is controlled to drive the driving roller group so as to drive the tray to be dislocated on the selected driven roller group to enter the tray transferring module, and the first driving module is controlled to drive the driving roller group to retract to the waiting position after the dislocating.
In an embodiment, the cavity is provided with a cooling plate at an inner side thereof, the cavity is provided with a first channel communicated with the tray transfer module and used for accommodating a tray to pass through, the cavity is further provided with a second channel and a third channel used for accommodating a driving roller group to extend into the selected unit, the first channel is arranged on a first side wall adjacent to the tray transfer module, and the second channel and the third channel are respectively arranged on a third side wall and a fourth side wall adjacent to and opposite to the first side wall.
The present invention also provides a PECVD apparatus, comprising: the loading module is used for placing the silicon wafers which are subjected to texturing into a tray and continuously conveying the tray; a tray transfer module for transferring the tray to be preheated, transferred by the loading module, to the tray preheating chamber of any one of the above embodiments, receiving the preheated tray transferred from the tray preheating chamber, and continuing to transfer the tray; the tray preheating cavity is used for receiving and preheating the trays conveyed by the tray conveying module and conveying the trays preheated to the preset preheating temperature back to the tray conveying module; a loading chamber configured to receive the preheated tray transferred by the tray transfer module and continue transferring the tray; a PECVD process cavity which is configured to receive the tray conveyed by the loading cavity, deposit and form an I/N or I/P type amorphous silicon film on one surface of the silicon chip carried by the tray through an intrinsic PECVD process and a doping PECVD process, and continuously convey the tray; an unloading cavity which is configured to receive the tray which is conveyed by the PECVD process cavity and is loaded with the silicon wafers after deposition, and continuously convey the tray; and an unloading module which receives the tray transferred by the unloading chamber and unloads the silicon wafer supported by the tray from the tray.
In an embodiment, the PECVD process chamber comprises a first PECVD process sub-chamber and a second PECVD process sub-chamber, the first PECVD process sub-chamber is used for performing an intrinsic PECVD process and depositing an I-type amorphous silicon thin film on one side of the silicon wafer, and the second PECVD process sub-chamber is used for performing a doping PECVD process so as to deposit an N-or P-type amorphous silicon thin film on the I-type amorphous silicon thin film.
In one embodiment, the PECVD apparatus further comprises a transfer chamber disposed between the first and second PECVD process sub-chambers and transferring the trays from the first PECVD process sub-chamber to the second PECVD process sub-chamber.
In one embodiment, the tray transfer module includes adjacent first and second doors, the first door being controllably openable to receive trays from the loading module and the second door being controllably openable to transfer preheated trays to the loading chamber.
Compared with the prior art, the invention has the following beneficial effects:
first, the tray preheating chamber of the present invention enables the tray to be heated to 40 to 250 ℃ outside the PECVD process chamber, thereby reducing the residence time of the tray in the PECVD process chamber and effectively improving the productivity of the apparatus.
Secondly, the tray preheating module of the tray preheating chamber comprises a second connecting piece connected to the first connecting piece of the chamber body in a longitudinally movable mode, a storage frame fixedly connected to the second connecting piece, and a plurality of layers of preheating units stacked in the storage frame along the longitudinal direction, wherein the control module controls the storage frame to move longitudinally to enable the selected unit to be aligned with the tray transferring module to transfer the trays in and out; the tray preheating cavity provided by the invention has the advantages that the tray preheating capacity is improved by preheating the trays in batches, and the preheating cavity and the corresponding transmission cavity do not need to be arranged for the tray entering the PECVD process cavity every time, so that the cost of PECVD equipment can be effectively reduced.
Thirdly, the control module of the tray preheating cavity can control each preheating unit in the plurality of preheating units to independently heat, and can adjust the heating power for each tray, so that the temperature rise of the trays is more flexible, and the heating efficiency can be effectively improved.
Drawings
The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments of the disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components having similar relative characteristics or features may have the same or similar reference numerals.
Fig. 1 is a schematic front view of a composition structure of an embodiment of a tray preheating chamber according to the present invention.
Fig. 2 is a schematic top view of the structure of the tray preheating chamber of fig. 1 with the drive wheel module 14 in the waiting position.
Fig. 3 is a schematic top view of the drive wheel module 14 in the tray preheating chamber of fig. 1 in the tray driving position.
FIG. 4 is a schematic front view of a PECVD apparatus according to an embodiment of the present invention.
Detailed description of the preferred embodiments
The invention will be described in detail below with reference to the accompanying drawings and specific embodiments so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the aspects described below in connection with the figures and the specific embodiments are exemplary only, and should not be construed as limiting the scope of the invention in any way. The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.
Referring to fig. 1 to 2, there are shown a front view and a top view of the composition of an embodiment of the tray preheating chamber of the present invention, respectively. As shown in fig. 1 and 2, the tray preheating chamber 1 is used for preheating the tray 2, the tray preheating chamber 1 is used for interacting with the tray transfer module 3 disposed outside the tray preheating chamber 1, and the tray preheating chamber 1 includes a chamber 10, a tray preheating module 11, a guide rail 12, a longitudinal driving module 13, a driving wheel module 14, and a control module 15. The respective components of the preheating chamber will be described in detail below.
The chamber 10 may be a cuboid surrounded by an aluminum frame embedded with an aluminum plate or a stainless steel plate and sealed relatively, and is provided with a first connecting member 100, and nitrogen or other inert gases (such as argon) may be introduced into the chamber 10 during operation of the preheating chamber 1 to prevent undesired oxidation of the silicon wafer preheated therein.
The tray preheating module 11 is disposed in the chamber 10 and includes a second connecting member 110, a storage frame 112, and a plurality of preheating units 114, the second connecting member 110 being adapted to be longitudinally movably connected to the first connecting member 100, the storage frame 112 being fixedly connected to the second connecting member 110, the plurality of preheating units 114 being stacked in the storage frame 112 in a longitudinal direction.
Both the first link 100 and the second link 110 form a ball screw. In the present embodiment, the first connecting member 100 is a lead screw longitudinally disposed in the chamber 10 and supported by a bearing (not shown), the length of the lead screw matches the stroke of the storage frame 112 in the chamber 10, the second connecting member 110 is a lead screw nut matching with the lead screw, and the storage frame 112 is fixedly connected to the lead screw nut 110.
Each preheating unit 114 comprises a partition plate 111, a heater 113 and a driven roller group 115 which are sequentially and longitudinally arranged, the partition plate 111, the heater 113 and the driven roller group 115 of each layer of preheating unit 114 are fixedly connected to the storage frame 112 according to the sequence from bottom to top, and a storage space 117 for accommodating the trays 2 to freely transfer in and out is arranged between each layer of driven roller group 115 and the adjacent partition plate 111 of the adjacent layer; the partition 111 is positioned lowermost, followed by the heater 113, and uppermost is the driven roller set 115.
The heater 113 can be heated under nitrogen or inert gas atmosphere, the heater 113 is many infrared heating fluorescent tubes, the baffle 111 is constructed and can reflect the infrared light that many infrared heating fluorescent tubes sent more than 90%, the baffle 111 can be aluminum plate or stainless steel board, in order to improve the reflectivity, can polish aluminum plate or stainless steel board. The control module 15 can control the heater 113 of each preheating unit 114 to independently perform heating. The driven roller groups 115 are used to support the trays 2, and each preheating unit 114 has a plurality of driven roller groups 115 having a conveying direction identical to that of the transfer roller groups 30 of the tray transfer module 3.
The longitudinal driving module 13 may be mounted outside the cavity 10 through a corresponding bracket for driving the second link 110 to move longitudinally relative to the first link 100 so as to drive the storage frame 112 to move longitudinally in the cavity 10. In this embodiment, the longitudinal driving module 13 is a stepping motor for driving the second connecting member 110 to move longitudinally relative to the first connecting member 100, and the stepping motor may be fixedly connected to the first connecting member 100 through a shaft coupling or the like.
The guide rail 12 is disposed in the cavity 10 and outside the storage frame 11 for accommodating the storage frame 11 to travel therein in a longitudinal direction, the longitudinal driving module 13 drives the storage frame 11 to move up and down along the guide rail 12, and the guide rail 12 can ensure that the storage frame 11 moves up and down in the cavity 10 without swinging.
The cooling plate 16 is disposed inside the cavity 10, the cavity 10 is provided with a first channel 102 communicated with the tray transfer module 3 for accommodating the tray 2 to pass through, the cavity 10 is further provided with a second channel and a third channel (not shown) for accommodating the driving roller set 140 extending into the selected unit 114 ″, the first channel 102 is opened on a first side wall adjacent to the tray transfer module 3, and the second channel and the third channel are respectively opened on a third side wall and a fourth side wall adjacent to and opposite to the first side wall.
Referring to fig. 2 and 3, which are schematic top views of the components of the driving wheel module 14 in the waiting position and the tray driving position, respectively, the driving wheel module 14 can drive the tray 2 to move on the driven roller set 115 in the tray driving position. The driver module 14 is disposed adjacent to the storage frame 11 and at both sides of the driven roller group 115, the driver module 14 has a tray driving position as shown in fig. 3 and a waiting position as shown in fig. 2, and the driver module 14 includes a driving roller group 140, a first driving module 142, and a second driving module 144. The first driving module 142 is used for driving the driving roller set 140 to horizontally extend and retract so as to move between the tray driving position and the waiting position, the second driving module 144 is used for driving the driving roller set 140 to rotate so as to drive the tray 2 to horizontally move, and both the first driving module 142 and the second driving module 144 can be arranged outside the cavity 10.
The driving wheel module 14 entering the waiting position waiting for call is shown in fig. 2, the driving wheel module 14 entering the waiting position may completely extend out of the cavity 10, or a part of the driving wheel module 14 may stay in the cavity 10 as shown in fig. 2, as long as the driving wheel module 14 in the waiting position does not block the storage frame 11 to move up and down.
As shown in fig. 3, the driving roller set 140 is extended into a selected one 114 "of the plurality of preheating units 114 in the tray driving position, and receives and drives the tray 2 into or out of position on a selected driven roller set 115" of the selected unit 114 "into the tray transfer module 3. The selected cells 114 "may include a single or multiple preheat cells. In the embodiment shown in fig. 1, the selected unit 114 "includes two preheating units 114, and the tray preheating module 11 includes 10 preheating units, so that the number of trays for preheating treatment is several times the number of trays entering the PECVD process chamber.
The control module 15 is configured to control the longitudinal driving module 13 to drive the storage frame 11 to move longitudinally to align the selected unit 114 "with the tray transfer module 3. The control module 15 controls the driving wheel module 14 to enter the tray driving position, to receive and drive the tray 2 to be in or out of position on the selected driven roller set 115 "when the tray 2 is transferred from the tray transfer module 3 to the selected unit 114" or reversely transferred, and controls the driving wheel module 14 to be retracted to the waiting position after being in or out of position. The control module 15 further controls the heater 113 of the preheating unit 114 carrying the tray 2 to heat in a nitrogen or inert gas atmosphere to maintain the temperature of the tray 2 at a preset preheating temperature, which may be in a range of 40-250 ℃. The temperature required to be maintained may be determined on a case-by-case basis, for example, the temperature of the tray 2 may be maintained at 40, 50, …, 100, 110, …, 240, 250 degrees celsius, or alternatively, at a temperature of between 40 and 250 degrees celsius, but not a whole ten.
Referring to fig. 1 to 3, when a tray 2 to be preheated needs to be transferred from the tray transfer module 3 to the selection unit 114, the control module 15 is configured to perform the following control actions: controlling the longitudinal driving module 13 to drive the storage frame 11 to move longitudinally to a position where the conveying surfaces of the selected driven roller group 115 are aligned with the conveying surfaces of the tray transfer module 3, that is, to align the transfer roller groups 30 of the tray transfer module 3 with the roller conveying surfaces of both the selected driven roller group 115; then, the first driving module 142 is controlled to drive the driving roller set 140 to extend into the selected unit 114 ″ and enter the tray driving position, then the second driving module 144 is controlled to drive the driving roller set 140 to rotate so as to drive the tray 2 to be in place on the selected driven roller set 115 ″, and after the driving roller set is in place, the longitudinal driving module 13 is controlled to drive the storage frame 11 to move upward for a predetermined distance, and finally the first driving module 142 is controlled to drive the driving roller set 140 to retract to the waiting position without hindrance.
The predetermined distance may be determined by practical considerations, and may be, for example, several millimeters or up to one centimeter, which is influenced by the height of the storage space 117, but is selected to ensure that the active roller set 140 does not touch the partition 111 or the heater 113 of the selected cell 114 ".
Referring to fig. 1 to 3, when it is desired to transfer a preheated tray from the selection unit 114 ″ to the tray transfer module 3, the control module 15 is configured to perform the following control actions: the longitudinal driving module 13 is controlled to drive the storage frame 11 to move longitudinally to a position where the conveying surface of the selected driven roller set 115 "is higher than the conveying surface of the tray transfer module 3 by a predetermined distance, then the first driving module 142 is controlled to drive the driving roller set 14 to extend into the selected unit 114" and advance to the tray driving position, then the longitudinal driving module 13 is controlled to drive the storage frame 11 to move downwardly by the predetermined distance so that the driving roller set 140 is in contact with the tray 2 to be discharged, then the second driving module 144 is controlled to drive the driving roller set 140, so that the tray 2 is driven to be dislocated on the selected driven roller set 115 "to enter the tray transfer module 3, and after being dislocated, the first driving module 142 is controlled to drive the driving roller set 140 to retract to the waiting position.
Referring to fig. 4, in conjunction with fig. 1-3, fig. 4 shows the components of an embodiment of a PECVD apparatus of the present invention. As shown in fig. 4, the PECVD apparatus 4 includes a loading module 40, a tray transfer module 3, a tray preheating chamber 1, a loading chamber 42, a first PECVD process chamber 44, a transfer chamber 46, a second PECVD process chamber 48, an unloading chamber 50, and an unloading module 52.
The loading module 40 is used to place the silicon wafer on which the texturing is completed in the tray 2 and transfer the tray 2 to the tray transfer module 3.
The tray transfer module 3 serves to transfer the tray to be preheated, transferred from the loading module 40, to the tray preheating chamber 1, and to receive the preheated tray 2 transferred from the tray preheating chamber 1, and to transfer the tray 2 to the loading chamber 42 in a direction perpendicular to the transfer direction of the tray preheating chamber 1, the transfer in the perpendicular direction being achieved by rotating the transfer roller set 30 by 90 degrees.
The tray transfer module 3 includes adjacent first and second doors 32 and 34. The first door 32 is adjacent the loading module 40 for controllably opening to receive the tray 2 from the loading module 40. The second door 34 is adjacent to the loading chamber 42 for controllably opening to transfer the preheated tray 2 to the loading chamber 42.
The tray preheating chamber 1 receives and preheats the tray 2 conveyed by the tray conveying module 3, and conveys the tray 2 preheated to a preset preheating temperature back to the tray conveying module 3, wherein the preset preheating temperature is in a range of 40-250 ℃. The preset preheating temperature can be set and selected according to specific conditions.
The loading chamber 42 is configured to receive the preheated tray 2 transferred by the tray transfer module 3 and transfer the tray 2 to the first PECVD process sub-chamber 44. The first PECVD process sub-chamber 44 is used to perform an intrinsic PECVD process and deposit an I-type amorphous silicon thin film on one side of the silicon wafer carried by the tray. For those skilled in the art, the formation of the type I amorphous silicon thin film by PECVD deposition is well known in the art and will not be described herein.
A transfer chamber 46 is provided between the first and second PECVD process sub-chambers 44, 48 for transferring the trays 2 from the first PECVD process sub-chamber 44 to the second PECVD process sub-chamber 48.
The second PECVD process chamber 48 is configured to receive a tray transferred from the transfer chamber 46 for performing a doping PECVD process to deposit an N-or P-type amorphous silicon thin film on the I-type amorphous silicon thin film. For those skilled in the art, the deposition of N or P type amorphous silicon thin film by doping PECVD process is well known in the art and will not be described herein.
In the present embodiment, the I-type amorphous silicon film and the N-type or P-type amorphous silicon film are formed in two process chambers, i.e., the first PECVD process chamber 44 and the second PECVD process chamber 48. In other embodiments of the present invention, the PECVD apparatus 4 may include only a single PECVD process chamber such that the I-type amorphous silicon thin film and the N-type or P-type amorphous silicon thin film are both formed in the single PECVD process chamber, in which the I/N or I/P-type amorphous silicon thin film is deposited on one side of the silicon wafer carried by the tray through the intrinsic PECVD process and the doping PECVD process.
The unloading chamber 50 is configured to receive the tray transferred from the second PECVD process chamber 48 and transfer the tray 2 to the unloading module 52. The unloading module 52 receives the tray 2 transferred by the unloading chamber 50 and unloads the silicon wafer supported by the tray 2 from the tray 2. The silicon wafer is then carried into other containers, such as a carrier box, for further processing to fabricate the heterojunction solar cell, such as depositing a transparent conductive film.
The tray preheating cavity comprises a cavity, a tray preheating module, a longitudinal driving module, a driving wheel module and a control module, wherein the control module is configured to control the longitudinal driving module to drive a storage frame of the tray preheating module to move longitudinally, so that selected units of a plurality of layers of preheating units in the storage frame are aligned with a tray transferring module outside the cavity, the control module controls the driving wheel module to enter a tray driving position when a tray is transferred into the selected units from the tray transferring module or reversely transferred out, the driving wheel module is connected with or separated from the selected driven roller set, and the driving wheel module is controlled to retract to a waiting position after the tray is connected with or separated from the selected driven roller set, and the control module also controls a heater of the preheating unit connected with the tray to heat in a nitrogen or inert gas atmosphere so as to maintain the temperature of the tray at 40-250 ℃. The invention can effectively improve the productivity of the equipment, reduce the cost of the equipment and effectively improve the flexibility and efficiency of heating.
The embodiments described above are provided to enable persons skilled in the art to make or use the invention and that modifications or variations can be made to the embodiments described above by persons skilled in the art without departing from the inventive concept of the present invention, so that the scope of protection of the present invention is not limited by the embodiments described above but should be accorded the widest scope consistent with the innovative features set forth in the claims.
Claims (10)
1. A tray preheating chamber for interaction of trays with tray transfer modules disposed outside thereof and for preheating of trays, the tray preheating chamber comprising:
a cavity provided with a first connector;
the tray preheating module is arranged in the cavity and comprises a second connecting piece, a storage frame and a plurality of layers of preheating units, wherein the second connecting piece is used for being longitudinally movably connected to the first connecting piece, the storage frame is fixedly connected to the second connecting piece, the plurality of layers of preheating units are longitudinally overlapped in the storage frame, and each layer of preheating unit comprises a partition plate, a heater and a driven roller set which are sequentially arranged along the longitudinal direction;
the longitudinal driving module is used for driving the second connecting piece to longitudinally move relative to the first connecting piece so as to drive the storage frame to longitudinally move in the cavity;
a driving wheel module adjacent to the storage frame and arranged at two sides of the driven roller group, wherein the driving wheel module is provided with a tray driving position for driving the tray to move on the driven roller group and a waiting position for waiting calling and not blocking the storage frame from moving up and down, and the driving wheel module extends into a selected unit of the preheating units at the tray driving position, and receives and drives the tray to be in place or out of place on the selected driven roller group of the selected unit to enter the tray transfer module; and
The control module is configured to control the longitudinal driving module to drive the storage frame to move longitudinally so that the selected unit is aligned with the tray transferring module, when a tray is transferred into the selected unit from the tray transferring module or is reversely transferred out, the control module controls the driving wheel module to enter the tray driving position, carry and drive the tray to be in place or out of place on the selected driven roller set, and controls the driving wheel module to retract to the waiting position after the tray is in place or out of place, and the control module also controls a heater of the preheating unit bearing the tray to heat in a nitrogen or inert gas atmosphere so as to maintain the temperature of the tray at a preset preheating temperature.
2. The tray preheating chamber according to claim 1, wherein both the first link and the second link form a ball screw, and the longitudinal driving module is a stepping motor that drives the second link to move longitudinally with respect to the first link.
3. The tray preheating chamber according to claim 2, wherein the first connecting member is a screw nut longitudinally disposed in the chamber and supported by a bearing, the second connecting member is a screw nut matched with the screw nut, the storage frame is fixedly connected to the screw nut, a guide rail for accommodating the storage frame to travel therein in a longitudinal direction is provided at an outer side of the storage frame, and the longitudinal driving module drives the storage frame to move up and down along the guide rail.
4. A tray preheating chamber according to claim 1 or 2, wherein the partition, the heater and the driven roller group of each layer of preheating units are fixedly connected to the storage frame in the order from bottom to top, and a storage space for accommodating a tray is provided between each layer of driven roller group and an adjacent partition of an adjacent layer; the preset preheating temperature is in the range of 40-250 ℃; the heater is a plurality of infrared heating lamp tubes, the partition board can reflect more than 90% of infrared light emitted by the infrared heating lamp tubes, and the control module can control the heater of each preheating unit in the preheating units to independently heat.
5. The tray preheating chamber according to claim 3, wherein the driving wheel module includes a driving roller set for driving the tray, a first driving module for driving the driving roller set to horizontally extend and retract to move between a tray driving position and a waiting position, and a second driving module for driving the driving roller set to rotate so as to drive the tray to horizontally move, and the first driving module and the second driving module are both disposed outside the chamber.
6. The tray preheating chamber of claim 5, wherein the control module, when transferring the tray to be preheated from the tray transfer module to the selected cell, is configured to: the longitudinal driving module is controlled to drive the storage frame to longitudinally move to a position where the conveying surface of the selected driven roller group is aligned with the conveying surface of the tray transferring module, the first driving module is controlled to drive the driving roller group to extend into the selected unit and enter the tray driving position after the aligned position is reached, the second driving module is controlled to drive the driving roller group to rotate after the tray driving position is reached, so that the tray is driven to be in place on the selected driven roller group, and the longitudinal driving module is controlled to drive the storage frame to upwardly move for a preset distance after the tray is in place, so that the first driving module is controlled to drive the driving roller group to be retracted to the waiting position without hindrance.
7. The tray preheating chamber of claim 5, wherein the control module, in transferring the preheated trays from the selected cell to the tray transfer module, is configured to: the longitudinal driving module is controlled to drive the storage frame to longitudinally move to a position where the conveying surface of the selected driven roller group is higher than the conveying surface of the tray transferring module by a preset distance, the first driving module is controlled to drive the driving roller group to extend into the selected unit and enter the tray driving position after the position is reached, the longitudinal driving module is controlled to drive the storage frame to downwards move by the preset distance after the tray driving position is entered, then the second driving module is controlled to drive the driving roller group so as to drive the tray to be dislocated on the selected driven roller group to enter the tray transferring module, and the first driving module is controlled to drive the driving roller group to retract to the waiting position after the dislocating.
8. The tray preheating chamber according to claim 5, wherein a cooling plate is disposed inside the chamber, the chamber is provided with a first passage communicated with the tray transfer module for receiving the tray therethrough, the chamber is further provided with a second passage and a third passage for receiving the driving roller set extending into the selected unit, the first passage is opened on a first side wall adjacent to the tray transfer module, and the second passage and the third passage are opened on a third side wall and a fourth side wall adjacent to and opposite to the first side wall, respectively.
9. A PECVD apparatus, comprising:
the loading module is used for placing the silicon wafers which are subjected to texturing into a tray and continuously conveying the tray;
a tray transfer module for sending the tray to be preheated, which is transferred by the loading module, to the tray preheating chamber of any one of claims 1 to 8, and receiving the preheated tray, which is transferred from the tray preheating chamber, and continuing to transfer the tray;
the tray preheating cavity is used for receiving and preheating the trays conveyed by the tray conveying module and conveying the trays preheated to the preset preheating temperature back to the tray conveying module;
a loading chamber configured to receive the preheated tray transferred by the tray transfer module and continue transferring the tray;
a PECVD process cavity which is configured to receive the tray conveyed by the loading cavity, deposit and form an I/N or I/P type amorphous silicon film on one surface of the silicon chip carried by the tray through an intrinsic PECVD process and a doping PECVD process, and continuously convey the tray;
an unloading cavity which is configured to receive the tray which is conveyed by the PECVD process cavity and is loaded with the silicon wafers after deposition, and continuously convey the tray; and
And an unloading module which receives the tray transferred by the unloading chamber and unloads the silicon wafer supported by the tray from the tray.
10. The PECVD apparatus of claim 9, wherein the PECVD process chamber comprises a first PECVD process sub-chamber and a second PECVD process sub-chamber, the first PECVD process sub-chamber is used for carrying out an intrinsic PECVD process and depositing and forming an I-type amorphous silicon film on one surface of the silicon wafer, and the second PECVD process sub-chamber is used for carrying out a doping PECVD process so as to deposit and form an N or P-type amorphous silicon film on the I-type amorphous silicon film; the PECVD equipment also comprises a transmission cavity which is arranged between the first PECVD process sub-cavity and the second PECVD process sub-cavity and used for transmitting the tray from the first PECVD process sub-cavity to the second PECVD process sub-cavity; the tray transfer module includes adjacent first and second doors, the first door being controllably openable to receive trays from the loading module, the second door being controllably openable to transfer preheated trays to the loading chamber.
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| CN202010704046.7A CN111850518A (en) | 2020-07-21 | 2020-07-21 | Tray preheating cavity and corresponding PECVD equipment |
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| CN202010704046.7A CN111850518A (en) | 2020-07-21 | 2020-07-21 | Tray preheating cavity and corresponding PECVD equipment |
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