Strontium-doped low-temperature-processed CsPbI2Br perovskite solar cells

Cho Fai Jonathan Lau, Meng Zhang, Xiaofan Deng, Jianghui Zheng, Jueming Bing, Qingshan Ma, Jincheol Kim, Long Hu, Martin A. Green, Shujuan Huang, Anita Ho-Baillie

Research output: Contribution to journalArticle

177 Citations (Scopus)

Abstract

Cesium (Cs) metal halide perovskites for photovoltaics have gained research interest due to their better thermal stability compared to their organic–inorganic counterparts. However, demonstration of highly efficient Cs-based perovskite solar cells requires high annealing temperature, which limits their use in multijunction devices. In this work, low-temperature-processed cesium lead (Pb) halide perovskite solar cells are demonstrated. We have also successfully incorporated the less toxic strontium (Sr) at a low concentration that partially substitutes Pb in CsPb1–xSrxI2Br. The crystallinity, morphology, absorption, photoluminescence, and elemental composition of this low-temperature-processed CsPb1–xSrxI2Br are studied. It is found that the surface of the perovskite film is enriched with Sr, providing a passivating effect. At the optimal concentration (x = 0.02), a mesoscopic perovskite solar cell using CsPb0.98Sr0.02I2Br achieves a stabilized efficiency at 10.8%. This work shows the potential of inorganic perovskite, stimulating further development of this material.

Original languageEnglish
Pages (from-to)2319-2325
Number of pages7
JournalACS Energy Letters
Volume2
Issue number10
DOIs
Publication statusPublished - 13 Oct 2017
Externally publishedYes

Bibliographical note

Erratum/Corrigendum exists for this article and can be found in ACS Energy Letters, 4(5), p.1215, doi: 10.1021/acsenergylett.9b00937.

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