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Washing method of washing-difficult reworked piece of crystalline silicon solar battery

A technology for solar cells and crystalline silicon, applied in crystal growth, chemical instruments and methods, post-processing details, etc., can solve the problems of difficult rework of reworked chips, difficult cleaning of reworked chips, and difficult cleaning of reworked chips, so as to improve product qualification rate, the effect of improving the pass rate

Inactive Publication Date: 2012-08-15
HUNAN RED SUN PHOTOELECTRICITY SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the existing difficulty of cleaning the reworked sheet that is difficult to clean, the present invention aims to provide a cleaning method for the difficult-to-clean reworked sheet of crystalline silicon solar cells, which can solve the problem that the reworked sheet is difficult to clean and rework. Reduce unqualified rate and increase yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for cleaning a crystalline silicon solar cell that is difficult to rework, when the object to be cleaned is a monocrystalline silicon solar cell, it specifically includes the following steps:

[0029] The first step is to use HF solution to remove metaphosphoric acid pollution, phosphosilicate glass or fingerprints on the diffused black battery, and Si on the rainbow printed battery. 3 N 4 Membrane; the specific process is:

[0030] A. Mix HF and process pure water according to the volume ratio of 1:10 to make HF conventional cleaning solution;

[0031] B. Put the reworked sheet that is difficult to clean into the HF solution to remove metaphosphoric acid pollution, phosphosilicate glass or fingerprints on the diffused blackened battery sheet, and Si on the rainbow printed battery sheet 3 N 4 membrane;

[0032] C. Rinse with pure process water;

[0033] D. Cell drying treatment.

[0034] Step 2: Use surface etching solution to corrode the surface of the s...

Embodiment 2

[0051] A method for cleaning a crystalline silicon solar cell that is difficult to rework, the cleaning steps are similar to those in Example 1, the main difference is that the object of cleaning is a polycrystalline silicon solar cell, and the surface etching solution used for cleaning the polycrystalline silicon solar cell is composed of HF, HNO 3Prepared with process pure water, the volume fraction of HF is 15%, HNO 3 The volume fraction is 45%, the volume fraction of process pure water is 40%, the corrosion temperature is 3°C, and the corrosion time is 20s.

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Abstract

The invention discloses a washing method of a washing-difficult reworked piece of a crystalline silicon solar battery. The method comprises the following three steps of: removing phosphorosilicate glass or a Si3N4 film of a battery piece by utilizing a HF solution; carrying out surface corrosion on a silicon wafer by utilizing a surface corrosion solution so as to simultaneously remove residual abnormal tracks on the silicon wafer to achieve the aim of cleanly washing the washing-difficult reworked piece; removing impurities including SiO2 and the like generated in a corrosion process through washing with the HF solution; and then removing the impurities including metal ions and the like through washing with a HCl solution. After the washing-difficult reworked piece is treated by the washing method, the reworked piece is subjected to repeated dispersion and a back working procedure so that the final conversion efficiency of the battery piece can reach the level of a normal battery piece; and the appearance of the battery piece is the same as that of the normal battery piece so as to achieve the aim of reworking and washing. Through the washing with the washing method disclosed by the invention, the yield of the washing-difficult reworked piece is improved to 95% from previous 50% after the washing-difficult reworked piece is reworked.

Description

technical field [0001] The invention relates to the processing field of solar cells, in particular the invention relates to a cleaning method for reworked sheets of crystalline silicon solar cells which are relatively difficult to clean. Background technique [0002] At present, crystalline silicon solar cells have high requirements on appearance, and it is difficult to clean some abnormal sheets in the production process due to unstable equipment and human misoperation in the production process by conventional cleaning methods. These abnormal films include fingerprints caused by misoperation by employees, diffusion burnt black and metaphosphoric acid pollution caused by abnormalities in the diffusion process, rainbow marks caused by abnormal discharge during PECVD coating, etc. [0003] The above-mentioned abnormal films will seriously affect the final yield and pass rate after the post-processing to the finished cell. Fingerprints are generally found on both sides. Fingerp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/24C30B33/10
Inventor 郭进刘文峰任哲成文
Owner HUNAN RED SUN PHOTOELECTRICITY SCI & TECH
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