Analysis of the Urbach tail in cesium lead halide perovskites
Analysis of the Urbach tail in cesium lead halide perovskites
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DOI：
10.1063/5.0076712
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发表时间：
2022-01-07
影响因子：
3.2
通讯作者：
Vinattieri, Anna
中科院分区：
文献类型：
--
作者：
Falsini, Naomi;Roini, Giammarco;Vinattieri, Anna
半导体中结构和动力学无序的作用是一个基本相关的话题，因为它对光致发光的谱线形状有贡献，并且它在决定能带边缘的载流子输运性质方面起着重要作用。在这方面，一类半导体，即卤化物钙钛矿，在过去十年中被深入研究，显示出一种特殊的无序程度，这是最近才被研究的。对卤化物钙钛矿中无序的研究兴趣与这类材料的大量创新应用有关，从能量收集到高亮度非相干和相干光发射器。从这个角度出发，我们证明了通过对不同实验条件下的光致发光的深入分析，可以提取关于卤化物钙钛矿中无序的定量信息。我们对用不同的合成/沉积方法制备的金属卤化物钙钛矿CsPbBr3的大量样品进行了研究，阐明了静态和动态贡献的相对重量。与理论预测进行了比较，对金属卤化物钙钛矿中激子/载流子-声子相互作用有了深刻的认识。
The role of structural and dynamical disorder in semiconductors is a topic of fundamental relevance because of its contribution to the spectral line shape of the photoluminescence, and it plays a major role in ruling the carrier transport properties at the band edge. In this regard, a class of semiconductors, i.e., halide perovskites, deeply investigated in the last decade, shows a peculiar degree of disorder, which has only been recently under investigation. The interest to study disorder in halide perovskites is related to the large set of innovative applications of this class of materials, spanning from energy harvesting to high brilliance incoherent and coherent light emitters. In this perspective, we show that quantitative information on the disorder in halide perovskites can be extracted by deep analysis of the photoluminescence in different experimental conditions. Our study, conducted on a large set of samples of a metal halide perovskite, CsPbBr 3, prepared with various synthesis/deposition methods, clarifies the relative weight of the static and dynamic contributions. A comparison with theoretical predictions is provided, gaining insights into the exciton/carrier-phonon interaction in metal halide perovskites.