Selective rounding for pyramid peaks and valleys improves the performance of SHJ solar cells. Issue 9 (6th May 2021)

• Record Type: Journal Article
• Authors: Du, Junlin; Meng, Fanying; Fu, Haoxin; Sun, Lin; Zhang, Liping; Han, Anjun; Shi, Jianhua; Xie, Yi; Liu, Zhengxin
• Is Part Of: Energy science & engineering. Volume 9:Issue 9(2021)
• Page Start: 1306
• Page End: 1312
• Publication Date: 2021-05-06
• Subjects: chemical polishing -- pyramid rounding -- SHJ solar cells -- surface treatment -- texturing; Energy industries -- Periodicals; Energy development -- Periodicals; Power resources -- Periodicals; 621.042
• DOI: 10.1002/ese3.900
• Languages: English
• ISSNs: 2050-0505

Abstract

Abstract: The first step in the fabrication of SHJ (silicon heterojunction) solar cells is forming random pyramids on the Si wafer surfaces. The pyramid profile would affect the following amorphous silicon deposition. Two CP (chemical polishing) solutions consist of HNO3 + HF and O3 + HF, respectively, are used to modify the pyramid profile. It is found that these two solutions have selective rounding effects on the pyramid profiles. The first one rounds the pyramid valleys and the second one rounds the pyramid peaks. The combination of the two CP methods improves the passivation quality of amorphous silicon and promotes the conversion efficiency of SHJ cells. Abstract : The textured wafer for SHJ solar cells is etched by two methods, and the pyramid peaks and valleys can be rounded selectively. The performance of SHJ cells is improved effectively by the combined rounding for pyramid peaks and valleys.