Efficient and stable all-inorganic perovskite solar cells based on nonstoichiometric Cs: XPbI2Brx (x > 1) alloys

Lyubov A. Frolova, Qing Chang, Sergey Yu Luchkin, Daming Zhao, Azat F. Akbulatov, Nadezhda N. Dremova, Andrey V. Ivanov, Elbert E.M. Chia, Keith J. Stevenson, Pavel A. Troshin

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Here we report a systematic study of all-inorganic perovskite-inspired systems based on CsxPbI2Brx alloys with x ranging from 0.95 to 4. The identified optimal non-stoichiometric composition Cs1.2PbI2Br1.2 delivered the best optoelectronic, structural and photovoltaic characteristics in combination with the improved stability. The elucidated remarkable effect of the Cs4PbI2Br4 impurity phase, serving as a reservoir of CsBr, on the photothermal stability and photovoltaic performance of CsPbI2Br perovskite films offers a new paradigm in the development of more efficient and stable all-inorganic perovskite solar cells.

Original languageEnglish
Pages (from-to)5314-5323
Number of pages10
JournalJournal of Materials Chemistry C
Volume7
Issue number18
DOIs
Publication statusPublished - 2019

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