文献类型：期刊文献

英文题名：High efficiency TOPCon solar cells with micron/nano-structured emitter for a balance of light-trapping and surface passivation

作者：Xu, Jiahui[1,2];Chen, Cheng[2];Liu, Cui[1];Chen, Jia[2];Liu, Zhifeng[2];Yuan, Xiao[1];Li, Hongbo[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]Jolywood Taizhou Solar Technol Co Ltd, Taizhou 225500, Jiangsu, Peoples R China

年份：2022

卷号：238

外文期刊名：SOLAR ENERGY MATERIALS AND SOLAR CELLS

收录：;EI(收录号：20220411516220);WOS:【SCI-EXPANDED(收录号:WOS:000761243600001)】；

基金：This work was supported by the National Key R&D Program of China (2018YFB1500300). We thank Changzhou Belight technology Co., Ltd for the help of the reactive ion etching process.

语种：英文

外文关键词：TOPCon; Nanopores; Light-trapping; Wide-angle; Surface passivation

摘要：At present, conventional micron-pyramid texture is imperfect for further reducing optical reflection loss and improving photoelectric conversion efficiency (PCE) of tunnel oxide passivating contact (TOPCon) solar cells. Herein, reactive ion etching technique is used to fabricate nanopores on top of pre-formed micron-pyramid silicon surface, called NPP structure. The equivalent medium layer with graded refractive index appeared on NPP textures makes the absorption of almost all incident light independent of the wavelength and angle. However, serious Auger recombination and surface recombination associated with NPP structure is detrimental to emitter passivation, usually counteracting the photocurrent gain. To identify an appropriate balance of light-trapping and surface passivation, we investigate the impact of different radio-frequency power (PRF) on the optical and electrical properties of TOPCon solar cells and discusses the underlying structural causes behind these observed improvements. Finally, we demonstrate NPP TOPCon solar cells with an average short-circuit current density of 41.44 mA/cm(2) and an average PCE of 23.55% at the PRF of 600 W. Besides, the external quantum efficiency results under various incident angles from 0 degrees to 70 degrees exhibited excellent wide-angle spectral absorption capability, which is significant for solar cells working in an outdoor environment.