Efficient and Composition‐Tolerant Kesterite Cu2ZnSn(S, Se)4 Solar Cells Derived From an In Situ Formed Multifunctional Carbon Framework. Issue 40 (23rd September 2021)

• Record Type: Journal Article
• Authors: Xu, Xiao; Guo, Linbao; Zhou, Jiazheng; Duan, Biwen; Li, Dongmei; Shi, Jiangjian; Wu, Huijue; Luo, Yanhong; Meng, Qingbo
• Is Part Of: Advanced energy materials. Volume 11:Issue 40(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-09-23
• Subjects: composition tolerance -- conductive carbon framework -- kesterite Cu 2ZnSn(S, Se) 4 -- metal–molecule coordination; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.202102298
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Broadening the processing window is of high importance for developing efficient Cu2 ZnSn(S, Se)4 (CZTSSe) solar cells. Herein, a high efficiency (active‐area: 13.5%) of CZTSSe solar cells achieved from thioglycolic acid (TGA)‐ammonia based water solution method is first reported. The cell performance exhibits the high tolerance to the element composition variations of the CZTSSe film. Film crystallization and chemical mechanism studies reveal that this high composition‐tolerance mainly benefits from an existence of a conductive carbon framework layer with high element accommodating ability and a phase‐segregation growth behavior of CZTSSe grains driven by thermodynamics properties of the heterogeneous film system. It is shown that Sn–TGA coordination capable to induce large metal–organic molecule clusters plays a critical role in forming the mesoscopic carbon layer. These results and related material mechanism provide new routes to regulate crystal growth of the CZTSSe film for further improving cell performance. Abstract : Herein, besides reporting the highest efficiency of Cu2 ZnSn(S, Se)4 (CZTSSe) solar cells based on the water solution method, the authors are devoted to exploring material and chemical mechanisms of CZTSSe films that exhibit a wide element composition window. It is revealed that the Sn–thioglycolic acid coordination induced multifunctional carbon framework plays a distinctive role in optimizing the CZTSSe crystal growth and cell band structure.