期刊
NANO ENERGY
卷 89, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106411
关键词
Carbon electrode; Perovskite solar cells; CsPbI3; Band level gradient; Cs2PbI2Cl2
类别
资金
- National Natural Science Foundation of China [21875013]
- Beijing Natural Science Founda-tion [2182031]
- Young Talent of Zhuoyue Program of Beihang University
The study investigates size mismatch-induced cation segregation in CsPbI3, which leads to improved hole selectivity at the CsPbI3/carbon interface, reducing carrier recombination loss in carbon-based perovskite solar cells.
The application of CsPbI3 inorganic perovskite in carbon-based perovskite solar cells without hole transporter (CPSCs) is expected to enhance device stability. However, due to the lower hole selectivity of carbon electrode than that of hole transporter, the efficiency of CsPbI3 C-PSCs is significantly suppressed. Herein, size mismatchinduced cation segregation in CsPbI3 is studied and employed to solve the problem. After treating CsPbI3 with CsX (X--Br, Cl and F) ethanol solutions, the larger size mismatch between X- and I- ions would induce the more obvious cation segregation. The moderate size mismatch between I- and Cl- ions allows a partial substitution of Iions with Cl- ions in CsPbI3 to form energy level gradient, and the CsCl residue on the surface tends to react with CsPbI3 to generate 2D Cs2PbI2Cl2 nanosheets, serving as an electron blocking layer. The synergistic effect of the energy level gradient and the electron blocking layer well improves hole selectivity at CsPbI3/carbon interface to reduce carrier recombination loss. As a result, the C-PSCs based on the CsCl-treated CsPbI3 achieve an efficiency of 15.23%, a record value for inorganic C-PSCs.
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