Ammonia induces a phase transformation of perovskite (CH3NH3)PbI3, leading to a rapid (<1 s) change in its color from brown to colorless (400–800 nm). This color change is reversed within seconds upon removing the NH3 source.
Y. Zhao and K. Zhu, Chem. Commun., 2014, 50, 1605 DOI: 10.1039/C3CC48522F
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