CN112951946B - Reworking process for PERC reworked battery - Google Patents
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- CN112951946B CN112951946B CN201911263990.7A CN201911263990A CN112951946B CN 112951946 B CN112951946 B CN 112951946B CN 201911263990 A CN201911263990 A CN 201911263990A CN 112951946 B CN112951946 B CN 112951946B
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- 238000000034 method Methods 0.000 title claims abstract description 63
- 101001073212 Arabidopsis thaliana Peroxidase 33 Proteins 0.000 title claims abstract 40
- 101001123325 Homo sapiens Peroxisome proliferator-activated receptor gamma coactivator 1-beta Proteins 0.000 title claims abstract 40
- 102100028961 Peroxisome proliferator-activated receptor gamma coactivator 1-beta Human genes 0.000 title claims abstract 40
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 238000002161 passivation Methods 0.000 claims description 4
- 238000007650 screen-printing Methods 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
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- 239000002253 acid Substances 0.000 abstract description 8
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- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 description 8
- 239000011521 glass Substances 0.000 description 4
- 239000005360 phosphosilicate glass Substances 0.000 description 4
- 229910021419 crystalline silicon Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
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- 229910004298 SiO 2 Inorganic materials 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
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- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 210000004243 sweat Anatomy 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01L31/04—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 adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
-
- 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
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Photovoltaic Devices (AREA)
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Abstract
The invention provides a reworking process of a PERC reworked battery, which is used for reworking and preparing the PERC reworked battery generated in a diffusion process and/or an etching process in the preparation process of the PERC solar battery. The reworking process of the PERC reworked battery comprises the following steps: s1, taking a PERC reworked battery to be reworked, and cleaning the PERC reworked battery by adopting a cleaning solution to remove surface dirt of the PERC reworked battery; s2, cleaning the cleaned PERC reworked battery again by using acid liquor to remove a surface oxide layer of the PERC reworked battery; and S3, placing the PERC reworked battery with the surface oxide layer removed in circulation equipment to prepare the PERC solar battery by utilizing a PERC preparation process. The reworking process of the PERC reworked battery simplifies the flow of the conventional PERC reworking process, improves the reworking efficiency of the PERC reworked battery and the high quality rate of the PERC solar battery manufactured by reworking, and reduces the reworking cost of the PERC reworked battery.
Description
Technical Field
The invention relates to a reworking process of a PERC reworked battery, and belongs to the technical field of solar battery processing.
Background
With the continuous development of solar technology, the improvement of the efficiency of the conventional screen-printed crystalline silicon solar cell is very limited, and the Passivated Emitter Rear Contact (PERC) solar cell gradually occupies the market space of the conventional screen-printed crystalline silicon solar cell by virtue of the advantages of high efficiency, large-scale production and the like.
In fact, in the manufacturing process of the conventional PREC solar cell, the PERC solar cell subjected to the thinning, hydrophilicity and insulation resistance tests of the PERC etching process, or the PERC solar cell contaminated by the finger contact in the PERC etching process, or the abnormal PERC solar cell due to the mechanical blocking during the continuous etching production process of the PERC solar cell, etc. are usually subjected to rework treatment to further reduce the consumption of cost.
Conventionally, it is necessary to collectively store and collectively re-texturize the PREC solar cells requiring rework as described above to perform the rework process of the entire process (as shown in fig. 1). Therefore, on one hand, the production time and cost of the PREC solar cell are wasted; on the other hand, when the PREC solar cell is prepared by the rework of the whole process, the thickness of the crystalline silicon in the PREC solar cell is further reduced, so that the problem that the PREC solar cell prepared by the rework is easy to crack and the like is caused, and the quality rate of the finished PREC solar cell after the rework is further reduced.
Accordingly, there is a need to provide a new rework process for a PERC rework cell to solve the above problems.
Disclosure of Invention
The invention aims to provide a rework process of a PERC rework battery, which simplifies the flow of the conventional PERC rework process, improves the rework capacity and the high quality rate of the PERC rework battery, and reduces the rework cost of the PERC rework battery.
In order to achieve the above object, the present invention provides a process for reworking a PERC reworked cell, which is used for the reworking preparation of the PERC reworked cell generated in a diffusion process and/or an etching process during the preparation of the PERC solar cell, and comprises the following steps:
s1, taking a PERC reworked battery to be reworked, and cleaning the PERC reworked battery by adopting a cleaning solution to remove surface dirt of the PERC reworked battery;
s2, cleaning the cleaned PERC reworked battery again by using acid liquor to remove a surface oxide layer of the PERC reworked battery;
and S3, placing the PERC reworked battery with the surface oxide layer removed in circulation equipment to prepare the PERC solar battery by utilizing a PERC preparation process.
As a further improvement of the present invention, the PERC preparation process in step S3 includes back passivation, front surface coating, back surface laser windowing, screen printing, and test packaging of the PERC reworked battery.
As a further improvement of the present invention, the cleaning liquid in step S1 is any one of a nitric acid solution, a sodium hydroxide solution and pure water.
As a further improvement of the present invention, the acid solution in step S2 is a hydrofluoric acid solution.
As a further improvement of the present invention, the rework process of the PERC rework battery further includes step S0 before step S1, where step S0 specifically is: and adopting a bearing jig to bear the PERC reworked batteries so as to enable the plurality of PERC reworked batteries to be arranged in a separated mode with the front faces upward and the back faces downward.
As a further improvement of the invention, the bearing jig is provided with a plurality of slots for bearing the PERC reworked battery, and the slots are arranged at intervals along a direction vertical to a horizontal plane.
As a further improvement of the present invention, the carrying fixture has a first mark disposed along a vertical direction and a second mark located below the first mark, and the front surface of the PERC rework cell is placed toward the first mark and the back surface thereof is placed toward the second mark.
As a further improvement of the present invention, the carrying fixture is a silicon wafer basket placed along the vertical direction, and the PERC rework cells are accommodated in the slots of the silicon wafer basket, so that the PERC rework cells are placed separately along the vertical direction.
The beneficial effects of the invention are: according to the reworking process of the PERC reworked battery, the surface oxide layer of the PERC reworked battery to be reworked is directly removed through the acid solution, so that the PERC reworked battery is directly subjected to secondary etching, the process procedures of secondary texturing and diffusion on the surface of the PERC reworked battery in the existing reworking process are eliminated, the performance of the reworked PERC solar battery and the high quality rate of the reworked PERC solar battery are ensured, and the reworking cost of the PERC reworked battery is effectively reduced.
Drawings
Fig. 1 is a process flow diagram of a PERC rework cell rework process in the prior art.
Fig. 2 is a schematic flow diagram of a rework process for PERC rework cells of the present invention.
Fig. 3 is a process flow diagram of a rework process of the PERC rework cell of fig. 2.
FIG. 4 is an SEM image of a hydrofluoric acid solution (HF) etched phosphosilicate glass.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.
In addition, it should be further noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Please refer to fig. 2 and fig. 3, which illustrate a process for reworking a PERC rework cell according to the present invention, the process is used for reworking a PERC rework cell during a process of manufacturing a PERC solar cell, specifically, the process for reworking a PERC rework cell includes: the PERC solar cell is subjected to PERC etching procedure thinning, hydrophilicity and insulation resistance tests in the PERC solar cell production and preparation process, or is polluted by finger contact in the PERC etching procedure, or is abnormal due to mechanical blocking in the PERC solar cell continuous etching continuous production process; namely, the PERC rework cell of the present invention mainly includes a cell which can be reworked due to improper operation after the diffusion process in the preparation process of the PERC solar cell and generated in the etching process.
The rework process of the PERC rework battery comprises the following steps:
s1, taking a PERC reworked battery to be reworked, and cleaning the PERC reworked battery by adopting a cleaning solution to remove surface dirt of the PERC reworked battery;
s2, cleaning the cleaned PERC reworked battery again by using acid liquor to remove a surface oxidation layer of the PERC reworked battery;
and S3, placing the PERC reworked battery with the surface oxide layer removed in circulation equipment to prepare the PERC solar battery by utilizing a PERC preparation process.
Further, the rework process of the PERC reworked battery further includes step S0 before step S1, where step S0 specifically is:
and adopting a bearing jig to bear the PERC reworked batteries so as to enable the PERC reworked batteries to be arranged in a separated mode with the front faces upward and the back faces downward.
The following description will describe steps S0 to S4 in detail.
S0, storing the PERC reworked battery which needs to be reworked and is generated in the production process of the PERC solar battery; in the invention, the bearing jig is provided with a plurality of slots for bearing the PERC reworked battery, and the slots are arranged in a separated manner along the direction vertical to the horizontal plane.
In fact, the PERC reworked batteries in the prior art are all stacked and stored by adopting the bearing box, so that friction is easily generated among a plurality of PERC reworked batteries, the PERC reworked batteries are worn, and the PERC reworked batteries are difficult to separate in the reworking process due to the stacked arrangement of a plurality of PERC reworked batteries. In view of this, the invention adopts the bearing jig to store the PERC reworked batteries in a separated manner, thereby avoiding the occurrence of abrasion among the PERC reworked batteries and facilitating the separation among the PERC reworked batteries.
The method defines that one side of the PERC reworked battery provided with the local metal contact structure is a back side, and the side opposite to the back side is a front side, so that the PERC reworked battery is arranged on the bearing jig in a mode that the front side faces upwards and the back side faces downwards, and the PERC reworked battery is placed in such a mode, the reduction of the electrical property of the PERC reworked battery caused by the fact that dust is accumulated on the back side of the PERC reworked battery in the long-time storage process is effectively prevented, and the high quality rate of the PERC solar battery manufactured by the PERC reworked battery after reworking is effectively ensured.
Furthermore, the bearing jig is also provided with a first mark and a second mark, wherein the first mark is arranged in the vertical direction, the second mark is positioned below the first mark, and the arrangement is such that a worker can place the PERC reworked battery according to the first mark and the second mark so as to enable the front surface to face the first mark and the back surface to face the second mark; the battery reworking and arrangement of the PERC is facilitated. Preferably, the first mark and the second mark are color marks.
In a preferred embodiment of the invention, the bearing jig is a silicon wafer basket placed along the vertical direction, the PERC rework cells are accommodated in the clamping grooves of the silicon wafer basket, and the first mark and the second mark are respectively arranged at the top and the bottom of the silicon wafer basket along the vertical direction, so that a plurality of PERC rework cells are stacked along the vertical direction; so set up, further reduced PERC reworks the equipment cost of battery in the rework process.
The step S1 is mainly used for removing the stains on the surface of the PERC reworked battery, and in the invention, the cleaning solution in the step S1 is nitric acid solution (HNO) 3 ) Any one of sodium hydroxide solution (NaOH) and pure water. Of course, in other embodiments of the present invention, the cleaning solution may be other cleaning solutions for removing stains from the surface of the PERC rework cell. Further, the staff need to wear gloves to complete corresponding operations in the process of transferring/storing the PERC reworked battery, so that secondary pollution or damage of the PERC reworked battery caused by sweat/grease of the staff can be effectively prevented, preferably, when the staff complete transferring/storing the PERC reworked battery by wearing the gloves, the worn gloves comprise rubber gloves directly worn on hands and disposable gloves worn on the outer sides of the rubber gloves, so that the disposable gloves can be replaced after transferring/storing the PERC reworked battery is completed, replacement of the rubber gloves with higher cost is effectively avoided, and the reworking cost of the PERC reworked battery is further reduced.
And S2, specifically, cleaning and removing an oxide layer on the surface of the PERC reworked battery by using acid liquor. In the invention, the acid solution for removing the oxide layer on the surface of the PERC reworked battery is hydrofluoric acid (HF), and further, the HF used in the invention has the same concentration as the HF used in the prior art for removing the phosphorosilicate glass on the surface of the solar battery, so that the HF used in the prior art for removing the phosphorosilicate glass on the surface of the solar battery and corresponding equipment can be directly used for removing the oxide layer on the surface of the PERC reworked battery, and the reworking preparation cost of the PERC reworked battery is further reduced.
In fact, HF has the property of corroding glass (including phosphosilicate glass, etc.) and inevitably diffuses phosphorus during diffusion in the production of existing solar modules, so HF corrosion is often used to remove phosphosilicate glass on the surface of solar cells, and further, the thickness of phosphosilicate glass used to remove the surface of solar cells is generally 30 to 40nm (as shown in fig. 3).
The oxide layer on the surface of the PERC reworked battery, namely the Potential Induced Degradation (PID) resistant layer, is usually SiO 2 The thickness of the film is only 1-7 nm, so that the oxide layer on the surface of the PERC reworked battery can be effectively removed by using HF for removing phosphorosilicate glass on the surface of the solar battery in the prior art, and the PN junction layer and the suede layer which are firstly prepared and positioned below the oxide layer are exposed, so that the suede layer and the PN junction layer can be obtained without performing a texturing process and a diffusion process again, the process steps of the reworking process of the PERC reworked battery are effectively simplified, and the reworking preparation cost of the PERC reworked battery is reduced.
Step S3 is specifically that the existing PERC preparation process is used for completing the reworking preparation of the PERC reworked battery; in the invention, the PERC preparation process comprises the steps of back passivation, front film coating, back laser windowing, screen printing and test packaging of the PERC reworked battery. Further, the specific process steps and process conditions of the passivation of the back side of the PERC reworked battery, the front side coating, the laser windowing of the back side, the screen printing and the test packaging in the PERC manufacturing process are well known to those skilled in the art, and are not limited herein.
The following table is a table comparing the performance of the PERC reworked cell after the oxide layer is removed and the PERC solar cell produced normally after the reworking treatment, wherein Isc is short-circuit current, uoc is open-circuit voltage, FF is fill factor, irev1/2 is reverse current-10/reverse current-12, and the comparison difference is the difference between the data related to the PERC solar cell prepared by reworking and the data related to the PERC solar cell prepared conventionally.
| Isc(A) | Uoc(V) | FF(％) | Irev1/2(A) | Average efficiency (%) | |
| Conventional preparation | 10.796 | 0.665 | 78.311 | 0.108 | 20.394 |
| Rework preparation | 10.755 | 0.660 | 79.071 | 0.002 | 20.365 |
| Contrast difference | -0.041 | -0.005 | 0.760 | -0.106 | -0.029 |
As can be seen from the above table, the PERC solar cell prepared by the rework process of the PERC reworked cell of the present invention has no significant difference from the PERC solar cell produced normally in terms of Electroluminescence (EL) and electrical properties, and the appearance meets the requirement of appearance detection of the normal PERC solar cell.
In summary, in the rework process of the PERC rework cell of the present invention, the acid solution is used to directly remove the oxide layer of the PERC rework cell to be reworked, so as to directly perform the secondary etching on the PERC rework cell, and the processes of secondary cleaning, texturing and diffusion on the surface of the PERC rework cell in the existing rework process are eliminated, thereby effectively reducing the rework cost of the PERC rework cell while ensuring the performance of the reprocessed PERC solar cell and the high quality rate of the reprocessed PERC solar cell.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (5)
1. A reworking process of a PERC reworked cell is used for reworking and preparing the PERC reworked cell generated in a diffusion process and/or an etching process in the preparation process of the PERC solar cell, and is characterized by comprising the following steps:
s1, taking a PERC reworked battery to be reworked, and cleaning the PERC reworked battery by adopting a cleaning solution to remove surface dirt of the PERC reworked battery, wherein the cleaning solution is any one of a nitric acid solution, a sodium hydroxide solution and pure water;
s2, cleaning the cleaned PERC reworked battery again by using a hydrofluoric acid solution to remove a surface oxide layer of the PERC reworked battery;
and S3, placing the PERC reworked battery with the surface oxide layer removed in circulation equipment, and preparing the PERC solar battery through back passivation, front film coating, back laser windowing, screen printing and test packaging.
2. The process of reworking a PERC reworked battery according to claim 1, wherein: the rework process of the PERC rework battery further includes a step S0 before the step S1, where the step S0 specifically is: and adopting a bearing jig to bear the PERC reworked batteries so as to enable the plurality of PERC reworked batteries to be arranged in a separated mode with the front faces upward and the back faces downward.
3. The process of reworking a PERC reworked battery according to claim 2, wherein: the bearing jig is provided with a plurality of slots for bearing the PERC reworked batteries, and the slots are arranged in a separated mode in the direction perpendicular to the horizontal plane.
4. The process of reworking a PERC reworked battery according to claim 3, wherein: the bearing jig is provided with a first mark and a second mark, the first mark is arranged in the vertical direction, the second mark is positioned below the first mark, and the front face of the PERC reworked battery faces the first mark and the back face of the PERC reworked battery faces the second mark.
5. The process of reworking a PERC reworked battery according to claim 2, wherein: the bearing jig is a silicon wafer basket placed in the vertical direction, and the PERC reworking batteries are contained in clamping grooves of the silicon wafer basket, so that the PERC reworking batteries are placed in a vertically separated mode.
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| CN102634800A (en) * | 2012-04-21 | 2012-08-15 | 湖南红太阳光电科技有限公司 | Washing method of washing-difficult reworked piece of crystalline silicon solar battery |
| CN102881771A (en) * | 2012-09-29 | 2013-01-16 | 湖南红太阳光电科技有限公司 | Metaphosphoric acid piece rework method in diffusion of monocrystalline silicon solar cell |
| CN103531667A (en) * | 2013-10-29 | 2014-01-22 | 海南英利新能源有限公司 | Unqualified solar cell slice processing method |
| CN104157739B (en) * | 2014-09-02 | 2017-08-15 | 海南英利新能源有限公司 | To the processing method of unqualified silicon chip |
| CN104993019A (en) * | 2015-07-09 | 2015-10-21 | 苏州阿特斯阳光电力科技有限公司 | Preparation method of localized back contact solar cell |
| CN106299023B (en) * | 2016-08-26 | 2017-12-22 | 奥特斯维能源（太仓）有限公司 | A kind of anti-PID solar cells are done over again the processing method of piece |
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