Industrially Rear Side Passivated Cz Mono-crystalline Cells with 19.5% Efficiency

Zhuo Xu, Xueliang Yang, Gaofei Li, Wenchao Zhao, Decheng Yang, Zhiyan Hu, Jingfeng Xiong Yingli Green Energy, Baoding, China

In photovoltaic industry, two critical way to reduce cost is to reduce material consumption and improve efficiency. In this work, we applied rear passivation (PERC) structure on conventioanally industrial P-type screen printed solar cell for high efficiency purpose. And an average efficiency of 19.5% is achieved on 6 inch (156mm x 156mm ) Cz mono-crystalline wafers. Due to the excellent rear side passivation, the Voc reaches 646mV and Jsc is 38.5mA/cm2, leading to about 1% absolute efficiency gain over the conventional cell. All processes are developed on high throughput machines, which show a potential for future production.