卤化物
钙钛矿(结构)
金属
比克西顿
材料科学
电子结构
化学物理
结晶学
纳米技术
无机化学
凝聚态物理
化学
冶金
量子点
物理
作者
Juan I. Climente,J. L. Movilla,Josep Planelles
标识
DOI:10.1021/acs.jpclett.4c01719
摘要
A theoretical description of biexcitons in metal halide perovskite nanoplatelets is presented. The description is based on a variational effective mass model, including polaronic effects by means of a Haken potential. The strong quantum and dielectric confinements are shown to squeeze the biexciton under the polaronic radius, which greatly enhances Coulomb attractions and (to a lesser extent) repulsions. This explains the need for effective dielectric constants approaching the high-frequency limit in previous simulations, and the binding energies exceeding 40 meV observed in single-monolayer nanoplatelets. Biexcitons are formed by a pair of weakly interacting excitons, with a roughly rectangular geometry. This translates into a constant ratio between biexciton and exciton binding energies (2D Haynes rule) well below the ideal value of Δ
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