METHOD FOR MANUFACTURING BACK CONTACT CRYSTALLINE SILICON SOLAR CELL SHEET

摘要

A method for manufacturing a back contact crystalline silicon solar cell sheet is provided. The method comprises: forming a via (4) on a semiconductor wafer (1) and performing texturing on surfaces (2,3) of the semiconductor wafer; forming a barrier layer (7) on one surface of the semiconductor wafer (1); printing a corrosive slurry surrounding the via (4) on the barrier layer (7) and cleaning the corrosive slurry to form a counter bore in the surrounding area of the via (4); diffusing on both surfaces (2,3) of the semiconductor wafer; removing the barrier layer (7) and processing the semiconductor wafer, thus obtaining the back contact crystalline silicon solar cell sheet. In the method, a local emitter junction (8) may be formed in the surrounding area of the via (4) by forming a window surrounding the via (4) on the backlight surface (3) before diffusion. So there is not a conductive layer which results in short circuit of the P-N junction. Compared with the prior art, the method avoids the laser isolating process and then reduces the risk of leakage and the breakage rate of the cell sheet.