Treatment method for unqualified semi-finished products of solar cells

Abstract

The embodiment of the invention discloses a treatment method for unqualified semi-finished products of solar cells. The method comprises the following steps of: classifying the unqualified semi-finished products of the solar cells into two classes according to defects caused before printing and defects caused after the printing, and marking the unqualified semi-finished products of the solar cells as first-class unqualified semi-finished products and second-class unqualified semi-finished products respectively; removing slurry from the second-class unqualified semi-finished products, and cleaning the second-class unqualified semi-finished products by using an alkaline solution; judging whether the defects of the second-class unqualified semi-finished products cleaned by the alkaline solution can by eliminated by a printing process, if so, printing the second-class unqualified semi-finished products cleaned by the alkaline solution, otherwise marking the second-class unqualified semi-finished products cleaned by the alkaline solution as third-class unqualified semi-finished products; and cleaning the first-class and third-class unqualified semi-finished products by using an acidic solution, and texturing the first-class and third-class unqualified semi-finished products cleaned by the acidic solution. By the treatment method for the unqualified semi-finished products of the solar cells, the inventory of the unqualified semi-finished products of the solar cells can be decreased, the qualified rate of finished products of the solar cells can be increased, and influence on normal production can be avoided.

Description

technical field [0001] The invention relates to the technical field of solar cell manufacturing, in particular to a method for processing unqualified semi-finished products of solar cells. Background technique [0002] The preparation process of conventional solar cells mainly includes: texturing, diffusion, wet etching, PECVD, printing, sintering and testing. Among them, texturing mainly uses chemicals to corrode the surface of the P-type silicon wafer into an uneven surface structure, increasing the number of reflections of light on the surface of the silicon wafer, thereby achieving the purpose of increasing light absorption; diffusion is in the P-type silicon wafer. A thin layer of N-type silicon is diffused on the surface to form a PN junction; wet etching is to use a certain proportion of chemicals to corrode the silicon wafer to remove the diffusion layer on the back and surrounding of the silicon wafer to achieve the front and back of the silicon wafer. The purpose ...

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Problems solved by technology

[0003] However, in the process of solar cell preparation, each process will bring certain defects to the surface of solar cells due to human or equipment reasons.

For example: yellow spots caused by the texturing process, black spots caused by diffusion, water marks not cleaned in the wet etching process, residual liquid medicine, unqualified PECVD coating and poor printing effect, etc.

If these semi-finished silicon wafers with surface defects are directly put into normal production, it will not only affect the normal production order, but after the sintering process, some of these semi-finished silicon wafers with surface defects will become substandard batteries and some will become damaged batteries. , which seriously affects the qualified rate of finished products of solar cells

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