CN102709382B - Sintering method for improving rear-passivated solar cell filling performance - Google Patents
Sintering method for improving rear-passivated solar cell filling performance Download PDFInfo
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- CN102709382B CN102709382B CN201210140670.4A CN201210140670A CN102709382B CN 102709382 B CN102709382 B CN 102709382B CN 201210140670 A CN201210140670 A CN 201210140670A CN 102709382 B CN102709382 B CN 102709382B
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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
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- 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
Abstract
The invention relates to a sintering method for improving rear-passivated solar cell filling performance. The sintering method specifically includes the steps of (1), slurry drying by means of placing a solar cell with front Ag slurry upward into a sintering furnace for slurry drying; (2), overturning and Al sintering by means of overturning the solar cell when the temperature rises to 500-550 DEG C to enable rear Al slurry of the solar cell to be placed upward so as to enter the sintering furnace for Al sintering; (3), secondary overturning and Ag sintering by means of overturning the solar cell again when the temperature of the sintering furnace rises to 750-780 DEG C to enable the front Ag slurry to be placed upward for Ag sintering; and (4), rapid cooling by means of cooling within the time of 0.5-1 minute. By the sintering method for improving the rear-passivated solar cell filling performance, the filling performance of the rear Al slurry can be improved while front emitters are guaranteed to be unpolluted, cavities are reduced, filling factors of the solar cell can be increased by 0.5%-1%, and efficiency is improved by 0.1-0.3%.
Description
Technical field
The present invention relates to a kind of sintering method that improves back of the body passivating solar battery filling capacity.
Background technology
The metallization operation of crystal-silicon solar cell is included in cell backside and the upper Al(aluminium of positive printing) slurry and Ag(silver) slurry, then in Fast Sintering stove, experience low temperature drying and high temperature sintering, form good metal-semiconductor contact.
At present, the sintering of solar cell generally adopts chain-type sintering furnace.After being completed for printing, before battery, Electrode Ag slurry is placed and is entered sintering furnace upward, and under certain belt speed, battery through drying, heats up and sintering successively, and the processes such as cooling complete.In whole sintering process, battery is that front Electrode Ag is starched upward and the placement down of back side Al slurry all the time, as shown in Figure 1.In this sintering process, front surface A g slurry can well form Ag-Si contact, and the Al at the back side starches, because Action of Gravity Field often affects, sintering character is poorer, it is more obvious that this carries on the back in passivating solar battery performance the next generation: in back of the body passivation cell, due to the existence of passivating back film, need to perforate on passivating film, Al slurry only contacts with silicon formation at tapping.In traditional sintering process, Al slurry face under, the effect of gravity can only be flowed by the mode of diffusion Al slurry to opening area, be subject to the impact of (diffusion velocity of silicon in aluminium is greater than the diffusion velocity of aluminium in silicon) of Kirkendall effect, Al slurry is difficult for filling opening area and is easy to form cavity.By statistics, the empty ratio of back of the body passivation cell local aluminum back surface field can be up to more than 50%.Cavity locates that not only BSF is narrow, and inactivating performance is bad, and has increased the string resistance Rs of battery, causes the reduction of filling capacity and battery efficiency.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, a kind of sintering method that improves back of the body passivating solar battery filling capacity is provided, improve the sintering character of back side Al slurry, reduce cavity.
The technical solution adopted for the present invention to solve the technical problems is: a kind of sintering method that improves back of the body passivating solar battery filling capacity, and concrete sintering step is as follows:
(1) slurry is dried: the solar cell piece that is printed with Al slurry and Ag slurry is placed and entered sintering furnace upward by positive Ag slurry, carries out slurry oven dry through the first humidity province, and bake out temperature is 200～400 DEG C, and the time is 30～50s;
(2) upset and Al sintering: solar cell piece is through heating zone, when heating-up time 15～25s is warmed up to 500～550 DEG C, solar cell piece is overturn, the Al slurry at the solar cell piece back side is placed upward enter sintering furnace to carry out Al sintering, Al sintering time 20～30s, Al sintering temperature is 550～750 DEG C, and the furnace zone of this section of sintering zone adopts quartzy furnace zone;
(3) secondary upset and Ag sintering: when sintering furnace temperature rises to 750～780 DEG C, again by solar cell piece upset, the Ag slurry in solar cell piece front is placed upward, carried out Ag sintering; In Ag sintering zone, temperature continues to be increased to 900 DEG C of left and right, and Ag sintering time is 20～30s;
(4) fast cooling: cooling in time 0.5～1min, sintering process completes.
The invention has the beneficial effects as follows: by above-mentioned sintering process and increase silicon wafer turnover technique then make back side Al slurry carry out Al sintering upward in sintering process, improve the sintering character of back side Al slurry, reduce empty generation; The Ag that again battery overturn the back when Ag sintering placement that faces up, ensures that front emitter is not contaminated; Can make the fill factor, curve factor of battery improve 0.5%-1%, improved efficiency 0.1-0.3%.
Brief description of the drawings
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is that cell piece of the prior art is placed schematic diagram;
Cell piece when Fig. 2 is technique Al sintering of the present invention is placed schematic diagram;
Embodiment
The present invention is further illustrated by reference to the accompanying drawings now.The schematic diagram that these accompanying drawings are simplification only illustrates basic structure of the present invention in a schematic way, and therefore it only shows the formation relevant with the present invention.
As shown in Figure 2, a kind of sintering method that improves back of the body passivating solar battery filling capacity, concrete sintering step is as follows:
(1) slurry is dried: the solar cell piece that is printed with Al slurry and Ag slurry is placed and entered sintering furnace upward by positive Ag slurry, carries out slurry oven dry through the first humidity province, and bake out temperature is 200～400 DEG C, and the time is 30～50s;
(2) upset and Al sintering: solar cell piece is through heating zone, when heating-up time 15～25s is warmed up to 500～550 DEG C, solar cell piece is overturn, the Al slurry at the solar cell piece back side is placed upward enter sintering furnace to carry out Al sintering, Al sintering time 20～30s, Al sintering temperature is 550～750 DEG C, the furnace zone of this section of sintering zone adopts quartzy furnace zone, avoids emitter to pollute;
(3) secondary upset and Ag sintering: when sintering furnace temperature rises to 750～780 DEG C, again by solar cell piece upset, the Ag slurry in solar cell piece front is placed upward, carried out Ag sintering; In Ag sintering zone, temperature continues to be increased to 900 DEG C of left and right, and Ag sintering time is 20～30s;
(4) fast cooling: cooling in time 0.5～1min, sintering process completes.
Increase silicon wafer turnover technique by above-mentioned sintering process and in the process of sintering, placement while making Al sintering faces up Al, Al slurry is because the effect of gravity can be flowed to slot area, thereby fill better the slot area of back of the body passivation cell, compensate to a certain extent the impact of Kirkendall effect, reduce empty formation, improved the sintering character of Al slurry.The placement and the Ag that battery overturn back when Ag sintering faces up, can reduce the pollution to emitter as much as possible.The present invention can improve the sintering character of back side Al slurry, ensures that front emitter is not contaminated simultaneously, reduces empty generation, can make the fill factor, curve factor of battery improve 0.5%-1%, improved efficiency 0.1-0.3%.
Taking above-mentioned foundation desirable embodiment of the present invention as enlightenment, by above-mentioned description, relevant staff can, not departing from the scope of this invention technological thought, carry out various change and amendment completely.The technical scope of this invention is not limited to the content on specification, must determine its technical scope according to claim scope.
Claims (1)
1. a sintering method that improves back of the body passivating solar battery filling capacity, is characterized in that: concrete sintering step is as follows:
(1) slurry is dried: the solar cell piece that is printed with Al slurry and Ag slurry is placed and entered sintering furnace upward by positive Ag slurry, carries out slurry oven dry through the first humidity province, and bake out temperature is 200～400 DEG C, and the time is 30～50s;
(2) upset and Al sintering: solar cell piece is through heating zone, when heating-up time 15～25s is warmed up to 500～550 DEG C, solar cell piece is overturn, the Al slurry at the solar cell piece back side is placed upward enter sintering furnace to carry out Al sintering, Al sintering time 20～30s, Al sintering temperature is 550～750 DEG C, and the furnace zone of Al sintering zone adopts quartzy furnace zone;
(3) secondary upset and Ag sintering: when sintering furnace temperature rises to 750～780 DEG C, again by solar cell piece upset, the Ag slurry in solar cell piece front is placed upward, carried out Ag sintering; In Ag sintering zone, temperature continues to be increased to 900 DEG C, and Ag sintering time is 20～30s;
(4) fast cooling: cooling in time 0.5～1min, sintering process completes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210140670.4A CN102709382B (en) | 2012-05-08 | 2012-05-08 | Sintering method for improving rear-passivated solar cell filling performance |
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| CN201210140670.4A CN102709382B (en) | 2012-05-08 | 2012-05-08 | Sintering method for improving rear-passivated solar cell filling performance |
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| CN102709382A CN102709382A (en) | 2012-10-03 |
| CN102709382B true CN102709382B (en) | 2014-11-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101840954A (en) * | 2009-03-18 | 2010-09-22 | 中国科学院微电子研究所 | Method for preparing double-faced PN crystal silicon solar batteries by utilizing traditional technique |
| CN102185009A (en) * | 2010-12-02 | 2011-09-14 | 江阴浚鑫科技有限公司 | Screen printing sintering method and system for crystalline silicon solar cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101840954A (en) * | 2009-03-18 | 2010-09-22 | 中国科学院微电子研究所 | Method for preparing double-faced PN crystal silicon solar batteries by utilizing traditional technique |
| CN102185009A (en) * | 2010-12-02 | 2011-09-14 | 江阴浚鑫科技有限公司 | Screen printing sintering method and system for crystalline silicon solar cell |
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Address after: 213031, No. 2, Tianhe Road, Xinbei Industrial Park, Jiangsu, Changzhou Patentee after: TRINA SOLAR Co.,Ltd. Address before: 213031, No. 2, Tianhe Road, Xinbei Industrial Park, Jiangsu, Changzhou Patentee before: trina solar Ltd. Address after: 213031, No. 2, Tianhe Road, Xinbei Industrial Park, Jiangsu, Changzhou Patentee after: trina solar Ltd. Address before: 213031, No. 2, Tianhe Road, Xinbei Industrial Park, Jiangsu, Changzhou Patentee before: CHANGZHOU TRINA SOLAR ENERGY Co.,Ltd. |
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