Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 20, Pages 6688-6692Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201902418
Keywords
cation displacement; lead-free perovskites; solar cells; thin films; tin
Categories
Funding
- National Natural Science Foundation of China [61874123, 21572235]
- National Key R and D Program of China [2018YFA0208501]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDA09020000]
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Tin-based halide perovskite materials have been successfully employed in lead-free perovskite solar cells, but the overall power conversion efficiencies (PCEs) have been limited by the high carrier concentration from the facile oxidation of Sn2+ to Sn4+. Now a chemical route is developed for fabrication of high-quality methylammonium tin iodide perovskite (MASnI(3)) films: hydrazinium tin iodide (HASnI(3)) perovskite film is first solution-deposited using presursors hydrazinium iodide (HAI) and tin iodide (SnI2), and then transformed into MASnI(3) via a cation displacement approach. With the two-step process, a dense and uniform MASnI(3) film is obtained with large grain sizes and high crystallization. Detrimental oxidation is suppressed by the hydrazine released from the film during the transformation. With the MASnI(3) as light harvester, mesoporous perovskite solar cells were prepared, and a maximum power conversion efficiency (PCE) of 7.13% is delivered with good reproducibility.
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