卤化物
分子内力
联轴节(管道)
自旋轨道相互作用
自旋(空气动力学)
凝聚态物理
物理
材料科学
化学
量子力学
无机化学
热力学
冶金
作者
Linghai Zhang,Xu Zhang,Gang Lü
标识
DOI:10.1021/acs.jpclett.0c02135
摘要
In two-dimensional (2D) halide perovskites, four distinct types of intramolecular band alignment (Ia, Ib, IIa, and IIb) can be formed between the organic and inorganic components. Molecular design to achieve desirable band alignments is of crucial importance to the applications of 2D perovskites and their heterostructures. In this work, by means of first-principles calculations, we have developed molecular design strategies that lead to the discovery of 2D halide perovskites with favorable band alignments toward light-emitting and photovoltaic applications. The same design strategies can be extended to vertical and lateral heterostructures of 2D perovskites with selective light emissions from the organic and/or inorganic layer of constituent 2D perovskites. For each intramolecular band alignment, the charge density and binding energy of the lowest energy exciton are examined. The effect of spin-orbit coupling (SOC) on the band structures is assessed. While SOC significantly lowers the band gaps in type-Ia and type-IIa alignments, it has a negligible effect in type-Ib and type-IIb alignments.
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