Component doping is the fundamental topic for modulating the properties of semiconductor materials. The introduction of doping ions into lead halide perovskites (LHPs) can not only maintain the excellent photoelectric properties but also enhance the stability of LHPs in open air and thermal environments. However, due to the “self-purification” effect in crystallography, there is an inherent trend to pop doping ions out of LHPs lattice. In this work, it is confirmed that in Mn²⁺ doped LHPs nanocrystals (NCs) the discharge of Mn²⁺ will be accelerated at higher temperatures. It is also proved that even at room temperature, the dopants in LHPs NCs will also actively “migrate”, resulting in declined optical performance. Therefore, for cation alloying/doping LHPs NCs, the migration of doping ions in the material should be considered in addition to the intrinsic halide migration characteristics. This work will provide a benign reference for application of doped LHPs NCs.

中文翻译：

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自净化对锰掺杂卤化物钙钛矿纳米晶光学性能的影响

成分掺杂是调节半导体材料性能的基本主题。在卤化铅钙钛矿（LHP）中引入掺杂离子不仅可以保持优异的光电性能，还可以增强LHP在露天和热环境中的稳定性。然而，由于晶体学中的“自净化”效应，存在将掺杂离子从LHP晶格中弹出的固有趋势。在这项工作中，证实了在Mn ^{2+掺杂的LHPs 纳米晶体（NCs）中，Mn 2+}的放电在较高温度下会加速。实验还证明，即使在室温下，LHP NC中的掺杂剂也会主动“迁移”，导致光学性能下降。因此，对于阳离子合金/掺杂LHP NC，除了固有的卤化物迁移特性外，还应考虑材料中掺杂离子的迁移。该工作将为掺杂LHPs NCs的应用提供良好的参考。