Dielectric Confinement and Exciton Fine Structure in Lead Halide Perovskite Nanoplatelets

Nanomaterials

Laurent Legrand¹  Christophe Testelin¹  Maria Chamarro¹  Thierry Barisien¹  Kaïs Boujdaria²  Amal Ghribi²  Rim Ben Aich² 

[1] Institut des NanoSciences de Paris, CNRS UMR 7588, Sorbonne Université, F-75005 Paris, France;LR01ES15 Laboratoire de Physique des Matériaux: Structure et Propriétés, Faculté des Sciences de Bizerte, Université de Carthage, Bizerte 7021, Tunisia;

关键词: perovskites;    nanoplatelets;    electronic and dielectric confinements;    exciton energy;    exciton fine structure;   

DOI  :  10.3390/nano11113054

来源: DOAJ

【 摘 要 】

Owing to their flexible chemical synthesis and the ability to shape nanostructures, lead halide perovskites have emerged as high potential materials for optoelectronic devices. Here, we investigate the excitonic band edge states and their energies levels in colloidal inorganic lead halide nanoplatelets, particularly the influence of dielectric effects, in a thin quasi-2D system. We use a model including band offset and dielectric confinements in the presence of Coulomb interaction. Short- and long-range contributions, modified by dielectric effects, are also derived, leading to a full modelization of the exciton fine structure, in cubic, tetragonal and orthorhombic phases. The fine splitting structure, including dark and bright excitonic states, is discussed and compared to recent experimental results, showing the importance of both confinement and dielectric contributions.

【 授权许可】

Unknown