Reworking technology of finished crystalline silicon solar cell

A technology of solar cells and cells, which is applied in the manufacture of circuits, electrical components, and final products, can solve the problems of waste of resources, failure to recycle scrapped appearance sheets, etc., and achieve the effect of saving production costs

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

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the existing inefficiency and appearance of scrapped sheets that have not been recycled, resulting in waste of resources, the present invention aims to provide a rework process for finished crystalline silicon solar cells. High-efficiency solar cells and scrapped solar cells are reworked, while precious metal electrodes are collected, and the reworked original silicon wafers are remade into high-efficiency solar cells, thereby improving resource utilization and overall yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of 125mm*125mm finished crystalline silicon solar cell rework process is an example, further introduces the present invention, and this rework process specifically comprises the following steps:

[0042] The first step: screening and classification of finished cells; the specific process is:

[0043] Screening and sorting low-efficiency cells by EL (infrared defect tester) or PL (photoluminescence tester). Select the finished cells with internal defects (such as dislocations) or black cores from the cells with low photoelectric conversion efficiency, and do not participate in the rework process. The rest of the cells with low photoelectric conversion efficiency caused by the process and the scrapped appearance can be reworked.

[0044] The second step: remove the aluminum back field of the cell; the specific process is:

[0045] 1. Mix hydrochloric acid and deionized water into a hydrochloric acid solution with a mass percentage of HCl between 15% and 20%.

[...

Embodiment 2

[0058] A rework process for a 156mm*156mm finished crystalline silicon solar cell, the process is similar to that of Example 1, the difference is that the minimum amount of thinning of the aluminum-silicon alloy layer of the finished cell with NaOH solution is 0.6g good.

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Abstract

The invention discloses a reworking technology of a finished crystalline silicon solar cell to solve an existing problem of resource wasting caused by not reclaiming low-efficiency and appearance-scrapped cells. The technology comprises following steps: 1) carrying out selection and classification on finished cells which need to be reworked; 2) restoring the classified finished cells into original silicon chips; and 3) manufacturing qualified cells from the original silicon chips by using a conventional technology. With the reworking technology of the invention, precious metal electrodes of the cells are reclaimed, qualified products are manufactured after the cells are restored into silicon chips, a yield rate exceeds 90%, and production cost is saved.

Description

technical field [0001] The invention relates to the field of reprocessing of solar cells, in particular to a method for reworking finished crystalline silicon solar cells, belonging to the technical field of semiconductor crystalline silicon and solar cell manufacturing. Specifically, the present invention is a process for reducing low-efficiency cells or discarded cells into original silicon chips by chemical methods, and then making finished cells. Background technique [0002] Under the current situation of the photovoltaic industry, higher photoelectric conversion efficiency and higher yield rate have become the embodiment of the core competitiveness of each company. Although the proportion of low-efficiency and appearance scrap produced by each company is not high (1%-2%), the accumulated amount is also amazing, and there is huge room for economic benefits for enterprises. In the conventional process, the various process steps of making silicon wafers into solar cells ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18
CPCY02P70/50
Inventor 刘文峰郭进任哲成文
Owner HUNAN RED SUN PHOTOELECTRICITY SCI & TECH
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