A Scalable Methylamine Gas Healing Strategy for High Efficiency Inorganic Perovskite Solar Cells

An easy and scalable methylamine (MA) gas healing method was realized for inorganic cesium based perovskite (CsPbX₃) layer by incorporating a certain amount of MAX (X=I or Br) initiator into the raw film. It was found that the excess MAX could accelerate the absorption rate of the MA gas into the CsPbX₃ film and quickly turn it into a liquid intermediate phase. Through the healing process, a high uniform and high crystallinity CsPbX₃ film with enhanced device performance was achieved. Moreover, the chemical interaction between a series of halides and MA gas molecules were studied and the results could offer guidance in further optimization of the healing strategy.

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