Repair technology and preparation technology of tubular PERC solar cell

Abstract

The invention discloses repair technology of a tubular PERC solar cell. The repair technology is set after annealing of a silicon wafer and before film coating of a back face of the silicon wafer. The repair technology comprises the following steps: (1) a semi-finished silicon wafer which stays over 4 hours after the annealing and before the film coating is placed into a repair furnace, nitrogen having a flow rate of 5-10slm is introduced into the repair furnace to achieve self-cleaning, and inlet time of the nitrogen is 1-5min; (2) nitrogen having a flow rate of 5-20slm is introduced to blow and sweep dust on the silicon wafer; (3) temperature of the repair furnace is raised from room temperature to 500-650 DEG C, and nitrogen having a flow rate of 1-5slm is introduced at the same time; and (4) the temperature of the repair furnace is kept at 500-650 DEG C for 5-30min, and nitrogen having a flow rate of 5-20slm is introduced at the same time. Correspondingly, the invention further discloses a preparation technology of the tubular PERC solar cell. Through adoption of the repair technology and the preparation technology, the problem of efficiency reduction brought by too long semi-finished product stay time is solved, and the EL yield rate is improved.

Description

technical field [0001] The invention relates to the field of PERC solar cells, in particular to a repair process for tubular PERC solar cells and a preparation process for tubular PERC solar cells. Background technique [0002] In the manufacturing process, process problems or downtime caused by machine failures often occur in each process, which will cause the semi-finished products of the previous process to stay. In some processes, the residence time of semi-finished products is too long, which will affect the performance of the finished product. The manufacturing process of tubular PERC cells is: texturing, diffusion, etching, annealing, back coating, front coating, laser, screen printing, and sintering. The inventors found in experiments that if the interval between annealing and back coating exceeds 4 hours, the conversion efficiency of the battery will drop significantly, and the longer the interval, the greater the drop in efficiency, and the maximum drop in efficien...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a repair process for tubular PERC solar cells, to solve the problem of efficiency drop caused by the long residence time of semi-finished products, and to improve the yield rate of EL

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