论文标题
铅卤化物中的光诱导的相分离是二极管效应
Photoinduced phase separation in the lead halides is a polaronic effect
论文作者
论文摘要
我们介绍了对多组分 - 甲酯钙钛矿中光诱导的卤化物相分离的最新观察结果。在稳态照明条件下，初始均质固体溶液的自发相分离在实验上是可逆的，随机的，弱依赖形态的，但强烈依赖于组成和热力学状态。在相分离时形成的特定卤化物物种富含的区域是自限制的，固定在特定的组成上，并与稳态载体浓度成比例地生长直至饱和。这些对鲁棒性的经验观察排除了基于特定缺陷结构的解释，并指出在存在过量电荷载体的情况下，现有的有效相位过渡的局部调节。回顾了基于组成，应变和电荷密度波动之间的耦合的现有观测值的模型。
We present a perspective on recent observations of the photoinduced phase separation of halides in multi-component lead-halide perovskites. The spontaneous phase separation of an initial homogeneous solid solution under steady-state illumination conditions is found experimentally to be reversible, stochastic, weakly dependent on morphology, yet strongly dependent on composition and thermodynamic state. Regions enriched in a specific halide species that form upon phase separation are self-limiting in size, pinned to specific compositions, and grow in number in proportion to the steady-state carrier concentration until saturation. These empirical observations of robustness rule out explanations based on specific defect structures and point to the local modulation of an existing miscibility phase transition in the presence of excess charge carriers. A model for rationalizing existing observations based on the coupling between composition, strain and charge density fluctuations through the formation of polarons is reviewed.
