The Significance of Polarons and Dynamic Disorder in Halide Perovskites
The Significance of Polarons and Dynamic Disorder in Halide Perovskites
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DOI：
10.1021/acsenergylett.1c00506
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发表时间：
2021-06
影响因子：
22
通讯作者：
Maximilian J Schilcher;P. J. Robinson;David J. Abramovitch;L. Tan;A. Rappe;D. Reichman;D. Egger
中科院分区：
文献类型：
--
作者：
Maximilian J Schilcher;P. J. Robinson;David J. Abramovitch;L. Tan;A. Rappe;D. Reichman;D. Egger
卤化物钙钛矿半导体的发展导致了光电子技术的各种技术突破，特别是在光伏和发光二极管领域。此外，对它们基本特性的研究还揭示了一些需要解释的有趣谜题。极化子效应与电子和空穴与极晶格振动的耦合有关，常被作为一种微观机制来解释各种不寻常的实验观察。虽然在这些体系中无疑存在某种形式的极化子行为，但在这些材料中，用于描述极化子机制的标准模型的几个基本假设似乎被严重违反了。从这个角度来看，我们研究了极化子效应在卤化物钙钛矿中的作用，并总结了极化子图像的特征和失效，以解释材料的物理特性。我们强调了互补动态无序概念的重要性，它可以使标准极化子和能带理论载流子输运图像无法解释的卤化物钙钛矿的各种关键性质合理化。
The development of halide perovskite semiconductors led to various technological breakthroughs in optoelectronics, in particular in the areas of photovoltaics and light-emitting diodes. Additionally, the study of their fundamental properties has uncovered intriguing puzzles that demand explanation. Polaronic effects associated with the coupling of electrons and holes to polar lattice vibrations are often invoked as a microscopic mechanism to explain various unusual experimental observations. While some form of polaronic behavior undoubtedly exists in these systems, several assumptions underlying standard models used to describe a polaron mechanism appear to be strongly violated in these materials. In this Perspective, we investigate the role of polaronic effects in halide perovskites and summarize signatures and failures of the polaron picture to explain physical characteristics of the materials. We highlight the importance of the complementary dynamic disorder concept that can rationalize various key properties of halide perovskites for which standard polaron and band-theory pictures of carrier transport fail.