Methylammonium-mediated phase-evolution behavior of FA1−xMAxPbI3 mixed-organic-cation perovskite (MOCP) is studied. It is found that by simply enriching the MOCP precursor solutions with excess methylammonium cations, the MOCPs form via a dynamic composition-tuning process that is key to obtaining MOCP thin films with superior properties. This simple chemical approach addresses several key challenges, such as control over phase purity, uniformity, grain size, composition, etc., associated with the solution-growth of MOCP thin films with targeted compositions.
Bibliographical noteFunding Information:
Financial support from the International S&T Cooperation Program of China (2015DFG62670), National Natural Science Foundation of China (51672290, 21671196, 61604156), Basic Research Program of Qingdao (15-9-1-17-jch, KJZD-14-38-JCH), the Youth Innovation Promotion Association of CAS (2015167) and the Qingdao Key Lab of Solar Energy Utilization and Energy Storage Technology, and the U.S. National Science Foundation (DMR-1305913 and OIA-1538893) is gratefully acknowledged.
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- crystal growth
- hybrid perovskites
- solar cells
- thin films