Formamidinium Lead Halide Perovskite Crystals with Unprecedented Long Carrier Dynamics and Diffusion Length

Ayan A. Zhumekenov, Makhsud I. Saidaminov, Mohammed Haque, Erkki Alarousu, Smritakshi P. Sarmah, Murali Banavoth, Ibrahim Dursun, Xiaohe Miao, Ahmed L. Abdelhady, Tao Wu, Omar F. Mohammed, Osman Bakr

Research output: Contribution to journalArticlepeer-review

742 Scopus citations

Abstract

State-of-the-art perovskite solar cells with record efficiencies were achieved by replacing methylammonium (MA) with formamidinium (FA) in perovskite polycrystalline films. However, these films suffer from severe structural disorder and high density of traps; thus, the intrinsic properties of FA-based perovskites remain obscured. Here we report the detailed optical and electrical properties of FAPbX3 (where X = Br- and I-) single crystals. FAPbX3 crystals exhibited markedly enhanced transport compared not just to FAPbX3 polycrystalline films but also, surprisingly, to MAPbX3 single crystals. Particularly, FAPbBr3 crystals displayed a 5-fold longer carrier lifetime and 10-fold lower dark carrier concentration than those of MAPbBr3 single crystals. We report long carrier diffusion lengths - much longer than previously thought - of 6.6 μm for FAPbI3 and 19.0 μm for FAPbBr3 crystals, the latter being one of the longest reported values in perovskite materials. These findings are of great importance for future integrated applications of these perovskites.
Original languageEnglish (US)
Pages (from-to)32-37
Number of pages6
JournalACS Energy Letters
Volume1
Issue number1
DOIs
StatePublished - 2016

Bibliographical note

KAUST Repository Item: Exported on 2021-12-13
Acknowledgements: The authors acknowledge the support of King Abdullah University of Science and Technology (KAUST) and Saudi Arabia Basic Industries Corporation (SABIC).

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