使用Cahn-Hilliard方程模拟卤化物钙钛矿中的离子反混合
Simulation of ion demixing in halide perovskites using Cahn-Hilliard equation
AI总结:
本文利用Cahn-Hilliard方程数值模拟混合卤化物钙钛矿的光致离子反混合,发现弹性变形抑制反混合而自由载流子促进反混合,且两者导致不同离子分布。
摘要:
使用唯象Cahn-Hilliard方程对混合卤化物钙钛矿中的光致离子反混合进行了数值模拟。在模型中,我们考虑了局部弹性变形的能量以及自由载流子的贡献,同时假设了极化子和带隙波动模型。模拟表明,弹性变形抑制了反混合,而自由载流子促进了反混合,然而这两种效应导致了不同的离子分布。自由载流子诱导的反混合仅在离子浓度具有较大的初始随机波动时出现。
英文摘要:
Light-induced ion demixing in mixed-halide perovskites is simulated numerically using the phenomenological Cahn-Hilliard equation. In the model we consider the energy of local elastic deformation as well as the contribution of free carriers, assuming both the polaron and the bandgap-fluctuation models. The simulation shows that elastic deformation suppresses the demixing while free carriers promote it, however both effects lead to different ion distributions. The free-carrier-induced demixing appears only for larger starting random fluctuations of the ion concentration.
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