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An in‐depth understanding and effective suppression of nonradiative recombination pathways in perovskites are crucial to their crystallization process, in which supersaturation discrepancies at different time scales between CH3NH3I (MAI, methylammonium iodide) and PbI2 remain a key issue. Here, an A‐site management strategy via the introduction of an A‐site placeholder cation, NH4+, to offset the...
In article number 1904702, Zhuo Kang, Yue Zhang, and co‐workers propose a concept of A‐site management by introducing an A‐site placeholder cation NH4+ during the perovskite crystallization process to balance the supersaturation discrepancy between AX and BX2 so as to improve its crystal quality without any residue. Such methodology successfully provides guidance for synthesis route design of highly...
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