公开(公告)号：EP4254513A1

公开(公告)日：2023-10-04

申请号：EP22885093.9

申请日：2022-05-30

申请人： Tongwei Solar (Meishan) Co., Ltd.

发明人： DENG, Mingzhang ,  XU, Wenzhou ,  HE, Yu ,  CHEN, Hao ,  ZHOU, Fan ,  MENG, Xiajie ,  ZHOU, Pengyu ,  YAO, Qian ,  XING, Guoqiang

IPC分类号： H01L31/0216 ,  H01L31/0224 ,  H01L31/18 ,  H01L31/0352 ,  H01L31/02 ,  H01L31/068

摘要： The present application provides a solar cell and a preparation method therefor and belongs to the technical field of photovoltaics. In a solar cell, the back surface of a substrate thereof is provided with alternately distributed emitter zones and back surface field zones. An emitter is formed in each emitter zone, and the emitters are made of boron-doped monocrystalline silicon. A back surface field is formed in each back surface field zone; the back surface fields comprise tunneling oxide layers and polycrystalline silicon layers in stacked distribution, the polycrystalline silicon layers being made of phosphorus-doped polycrystalline silicon, and the tunneling oxide layers being located between a polycrystalline silicon layer and a polycrystalline silicon layer. Positive electrodes of the solar cell are electrically connected to the emitters, and negative electrodes of the solar cell are electrically connected to the back surface fields. The preparation method for a solar cell is used for preparing a solar cell having the described structure. In the described solar cell, the light-receiving area of the front surface can be expanded and the recombination rate of electron-hole pairs can be reduced, thereby effectively improving the photoelectric conversion efficiency of the solar cell.