Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 139, Issue 29, Pages 10055-10061Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b04930
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Funding
- ERC [320860]
- Swiss National Science Foundation [200021_160112]
- Marie Sklodowska-Curie fellowship [707168]
- Marie Curie Actions (MSCA) [707168] Funding Source: Marie Curie Actions (MSCA)
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Mixed-cation organic lead halide perovskites attract unfaltering attention owing to their excellent photovoltaic properties. Currently, the best performing perovskite materials contain multiple cations and provide power conversion efficiencies up to around 22%. Here, we report the first quantitative, cation-specific data on cation reorientation dynamics in hybrid mixed-cation formamidinium (FA)/methylammonium (MA) lead halide perovskites. We use N-14, H-2, C-13, and H-1 solid-state MAS NMR to elucidate cation reorientation dynamics, microscopic phase composition, and the MA/FA ratio, in (MA)(x)(FA)(1-x)PbI3 between 100 and 330 K. The reorientation rates correlate in a striking manner with the carrier lifetimes previously reported for these materials and provide evidence of the polaronic nature of charge carriers in PV perovskites.
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