A method for improving the conversion efficiency of cell reworked products after anti-reflection film coating

Abstract

The invention discloses a method for improving defective product reworking conversion efficiency after a battery is plated with an antireflection film. The method includes the steps that (a) an HF solution with the concentration of 10 percent is prepared, and a piece of rainbow glass is put into the HF solution for 5-10 minutes; (2) after the rainbow glass is cleaned and dried in a spinning mode, the single film-plated surface is corroded through a back corrosion etching groove by being put downwards; (3) after the rainbow glass is dried, the lower surface serves as a diffusion surface, a PN junction is manufactured, the periphery is etched, the battery is plated with the antireflection film, and screen printing is carried out. The method adopts existing production line equipment, the process is improved, the rework yield is improved, and the conversion efficiency is improved by about 0.1 percent compared with a normal piece process. The thickness of a reworked piece only needs to be eliminated by 2-3 micrometers, the thickness of the battery piece is guaranteed, and the piece breaking rate is lowered.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a method for improving the conversion efficiency of a reworked product of a battery sheet coated with an anti-reflection film and reducing fragments. Background technique [0002] At present, the main manufacturing process of monocrystalline and polycrystalline silicon solar cells has been standardized, and the main steps are as follows: [0003] 1. Chemical cleaning and surface texturing treatment: through chemical reaction, the original bright silicon wafer surface forms an uneven structure to increase light absorption; [0004] 2. Diffusion: The surface of the P-type silicon wafer becomes N-type after phosphorus is diffused, forming a PN junction, which makes the silicon wafer have a photovoltaic effect. The concentration, depth and uniformity of diffusion directly affect the electrical performance of solar cells. The total amount of impurities diffused is mea...

AI Technical Summary

Problems solved by technology

At present, in the production line, 10% HF is used to remove the silicon nitride film for the rework process of the rainbow film in the production line-cleaning before returning to the next process, and the silicon nitride can not be completely removed by HF etching. This process is harmful to the silicon wafer. The thickness must be removed by 6-7μm, which increases the fragmentation rate and reduces the conversion efficiency

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