Angewandte Chemie - International Edition
Angewandte Chemie - International Edition
5 years ago

Methylammonium-Mediated Evolution of Mixed-Organic-Cation Perovskite Thin Films: A Dynamic Composition-Tuning Process

Methylammonium-Mediated Evolution of Mixed-Organic-Cation Perovskite Thin Films: A Dynamic Composition-Tuning Process
Li Wang, Yue Chang, Chongwen Li, Guanglei Cui, Nitin P. Padture, Yuanyuan Zhou, Yingxia Zong, Lioz Etgar, Shuping Pang
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. Under control: FA1−xMAxPbI3 mixed-organic-cation iodide perovskite (MOCP) thin films have been synthesized. By simply enriching the precursor solutions with methylammonium cations, the MOCPs form via a dynamic composition-tuning process that is key to obtaining thin films with superior properties, exact composition, excellent uniformity, and extra-large grains.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201704188

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