期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 40, 页码 14173-14180出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b07223
关键词
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资金
- ERC [320860]
- Swiss National Science Foundation [200021_160112]
- Marie Sklodowska-Curie fellowship, H2020 [707168]
- King Abdulaziz City for Science and Technology (KACST)
- Marie Curie Actions (MSCA) [707168] Funding Source: Marie Curie Actions (MSCA)
- Swiss National Science Foundation (SNF) [200021_160112] Funding Source: Swiss National Science Foundation (SNF)
Hybrid (organic-inorganic) multication lead halide perovskites hold promise for a new generation of easily processable solar cells. Best performing compositions to date are multiple-cation solid alloys of formamidinium (FA), methylammonium (MA), cesium, and rubidium lead halides which provide power conversion efficiencies up to around 22%. Here, we elucidate the atomic-level nature of Cs and Rb incorporation into the perovskite lattice of FA-based materials. We use Cs-23, Rb-87, K-89, C-13, and N-14 solid-state MAS NMR to probe microscopic composition of Cs-, Rb-, K-, MA-, and FA-containing phases in double-, triple-, and quadruple-cation lead halides in bulk and in a thin film. Contrary to previous reports, we have found no proof of Rb or K incorporation into the 3D perovskite lattice in these systems. We also show that the structure of bulk mechanochemical perovskites bears close resemblance to that of thin films, making them a good benchmark for structural studies. These findings provide fundamental understanding of previously reported excellent photovoltaic parameters in these systems and their superior stability.
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