SILICON SOLAR CELL WITH FRONT ELECTRODES COVERED BY THIN FILM AND PROCESS FOR MANUFACTURING SAME

摘要

A silicon solar cell with front electrodes covered by a thin film and a process for manufacturing the same. When an MWT back contact solar cell is manufactured, the front electrodes are covered completely by an antireflection film, namely the front electrodes are directly in contact with the silicon wafer without penetration of the antireflection film, so as to reduce the series resistance, and improve the cell conversion efficiency. Meanwhile, the penetration depth when the front electrode silver paste is printed is also easier to control, so that the process is simplified. The front electrodes covered completely by the antireflection film are not directly in contact with the outside, so as to improve the corrosion resistance and oxidation resistance of the front electrodes.

主权项

1. A process for manufacturing a thin-film covered MWT solar cell, comprising the following steps:
1) selecting a silicon wafer of a first conductivity type, and forming a cell substrate with via holes by providing the via holes in predetermined positions of the silicon wafer, texturing, diffusing, performing via hole back junction protection and etching; 2) removing PSG on the surface of the cell substrate; 3) filling paste into the via holes in the cell substrate, preparing back electrodes, and then drying; 4) preparing back surface fields, and then drying; 5) preparing front electrodes of the cell, and then drying; 6) plating an antireflection film on the upper surface of the cell substrate formed in step 4), so that the front electrodes are completely covered by the antireflection film; and 7) testing and sorting after sintering;