Damp-Heat-Stable, High-Efficiency, Industrial-Size Silicon Heterojunction Solar Cells

by Wenzhu Liu, Liping Zhang, Xinbo Yang, Jianhua Shi, Lingling Yan, Lujia Xu, Zhuopeng Wu, Renfang Chen, Jun Peng, Jingxuan Kang, Kai Wang, Fanying Meng, Stefaan De Wolf, Zhengxin Liu
Article Year: 2020

Bibliography

Wenzhu Liu, Liping Zhang, Xinbo Yang, Jianhua Shi, Lingling Yan, Lujia Xu, Zhuopeng Wu, Renfang Chen, Jun Peng, Jingxuan Kang, Kai Wang, Fanying Meng, Stefaan De Wolf, and Zhengxin Liu. Damp-Heat-Stable, High-Efficiency, Industrial-Size Silicon Heterojunction Solar Cells. Joule (2020)

Extra Information

This study, published in Joule, reports 23.9%-efficient 6-in silicon heterojunction solar cells with improved damp-heat-stability for aiming the mass production.

Abstract

The last few years have seen the photovoltaic market gradually evolve from aluminum back surface field (Al-BSF) solar cells to passivated emitter and rear (PERx) solar cells. Currently, we are looking at full-area passivating-contact c-Si solar cells on their way to mass production. Amorphous/crystalline silicon heterojunction (SHJ) solar cells hold the world-record power conversion efficiency (PCE; 26.7%) among c-Si solar cells, when integrated with an all back-contact design. Here, we present a roadmap to gaining high-efficiency SHJ solar cells, whose PCE is pushed to 23.4% on 6-in devices. However, such high-PCE solar cells are susceptible in damp-heat environments. The feasibility of mass production of long-term, stable, high-efficiency (23.9%) SHJ solar cells has been successfully demonstrated by capping with SiNx/SiOx antireflection coatings (ARCs). The ARCs have dual functions: (1) antireflection and (2) preventing moisture oxidizing amorphous silicon.

Keywords

silicon heterojunction (SHJ) damp-heat test