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An easy and scalable methylamine (MA) gas healing method was realized for inorganic cesium-based perovskite (CsPbX3) layers by incorporating a certain amount of MAX (X=I or Br) initiators into the raw film. It was found that the excess MAX accelerated the absorption of the MA gas into the CsPbX3 film and quickly turned it into a liquid intermediate phase. Through the healing process, a highly uniform and highly crystalline CsPbX3 film with enhanced photovoltaic performance was obtained. Moreover, the chemical interactions between a series of halides and MA gas molecules were studied, and the results could offer guidance in further optimizations of the healing strategy.
Shaik Mohammed Zakeeruddin, Ursula Röthlisberger, Sandy Sanchez Alonso, Narges Yaghoobi Nia, Ulf Anders Hagfeldt, Hong Zhang, Dan Ren, Linfeng Pan, Paramvir Ahlawat, Masaud Hassan S Almalki, Viacheslav Bolnykh, Anurag Krishna, Tzu-Sen Su