Water-Induced Dimensionality Reduction in Metal-Halide Perovskites
B. Turedi, K. Lee, I. Dursun, B. Alamer, Z. Wu, E. Alarousu, O.F. Mohammed, N. Cho, O.M. Bakr
Journal of Physical Chemistry C, 2018, 122, 1412814134, (2018)
Optoelectronic, Photoluminescence, Synthetic method, 2D perovskite
Metal-halide perovskite materials are highly attractive materials for optoelectronic applications. However, the instability of perovskite materials caused by moisture and heat-induced degradation impairs future prospects of using these materials. Here we employ water to directly transform films of the three-dimensional (3D) perovskite CsPbBr3 to stable two-dimensional (2D) perovskite-related CsPb2Br5. A sequential dissolution-recrystallization process governs this water induced transformation under PbBr2 rich condition. We find that these post-synthesized 2D perovskite-related material films exhibit excellent stability against humidity and high photoluminescence quantum yield. We believe that our results provide a new synthetic method to generate stable 2D perovskite-related materials that could be applicable for light emitting device applications.
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