Journal
SOLAR ENERGY
Volume 216, Issue -, Pages 351-357Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2021.01.030
Keywords
CsPbI2Br; All inorganic perovskite solar cells; Interface modification; High efficiency; Carbon electrode
Categories
Funding
- China Scholarship Council (CSC) [201908050025]
- Japan Society for the Promotion of Science [20K15381]
- National Natural Science Foundation of China [51972293, 51772039]
- [19H02818]
- Grants-in-Aid for Scientific Research [20K15381] Funding Source: KAKEN
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All-inorganic perovskite material CsPbI2Br has excellent thermal stability but low power conversion efficiency. This study uses a sulfur-rich small molecule to modify the interface between CsPbI2Br and carbon electrode, achieving a high efficiency of 13.78% for the carbon-based CsPbI2Br PSCs. The PCE improvement is attributed to the significant reduction in defect density and suppression of recombination.
All-inorganic perovskite materials, typically CsPbI2Br, have received widespread attention owing to their outstanding thermal stability than that of organic/inorganic hybrid counterparts. However, the power conversion efficiency (PCE) of CsPbI2Br perovskite solar cell (PSC) is far lower than its theoretical value. In this study, to further improve the PCE, a sulfur-rich small molecule material (delta-2:2-bis (1,3-dithiazole)), is used to modify the interface between CsPbI2Br and carbon electrode. Encouragingly, the carbon-based CsPbI2Br PSCs achieve a high PCE of 13.78% than the control of 10.40%, which is the best performance of carbon-based CsPbI2Br PSC among the literature report at present. The remarkable reduction of defect density and suppression recombination should be responsible for the PCE improvement. This work proposes a simple and effective strategy to enhance the efficiency of all-inorganic carbon-based CsPbI2Br PSCs.
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