Alloyed (Cu2SnS3)x(ZnS)1−x quantum dots as a hole-transporting layer for efficient and stable perovskite solar cells. (August 2021)

• Record Type: Journal Article
• Authors: Ma, Mengen; Zhou, Qing; Ma, Wenbo; Zhang, Zhenlong; Kang, Miao; Gao, Wei; Ma, Xinqi; Liu, Yuefeng; Mao, Yanli
• Is Part Of: Solar energy. Volume 224(2021)
• Page Start: 1170
• Page End: 1177
• Publication Date: 2021-08
• Subjects: Perovskite solar cell -- Hole transport layer -- Alloyed quantum dots -- Efficiency -- Stability; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2021.06.084
• Languages: English
• ISSNs: 0038-092X

Abstract

Graphical abstract: The efficiency and stability of the PSCs based on the alloyed (Cu2 SnS3 )0.7 (ZnS)0.3 nanocrustals were improved compared with those of the devices based on Cu2 SnS3 . Highlights: Alloyed (Cu2 SnS3 )x (ZnS)1−x nanocrystals were synthesized and applied in PSCs. High efficiency of 17.2% was obtained for the PSCs with (Cu2 SnS3 )0.7 (ZnS)0.3. Stability of the PSCs with (Cu2 SnS3 )0.7 (ZnS)0.3 was improved by alloying with ZnS. Abstract: In the present study, alloyed (Cu2 SnS3 )x (ZnS)1−x quantum dots (QDs) were prepared by combining Cu2 SnS3 and ZnS. The alloyed (Cu2 SnS3 )x (ZnS)1−x was applied to perovskite solar cells (PSCs) as an inorganic hole transport layer. The power conversion efficiency (PCE) of the solar cells based on (Cu2 SnS3 )x (ZnS)1−x was optimized by tuning the content of ZnS. A high PCE of 17.02% was obtained for the solar cells based on the optimized (Cu2 SnS3 )0.7 (ZnS)0.3 quantum dots, while that of the solar cells based on Cu2 SnS3 was 15.96%. The experimental data demonstrate that the enhancement of PCE could be due to the high conductivity of the alloyed (Cu2 SnS3 )0.7 (ZnS)0.3 QDs and suitable energy level alignment between the corresponding QDs and perovskite layer. In addition, the PSCs based on the alloyed (Cu2 SnS3 )0.7 (ZnS)0.3 possess superior stability compared with that of the Cu2 SnS3 based devices. This work displays that (Cu2 SnS3 )0.7 (ZnS)0.3 QDs can be used as a novel inorganic hole transport material to PSCs.