Ghribi Amal, Ben Aich Rim, Boujdaria Kaïs, Barisien Thierry, Legrand Laurent, Chamarro Maria, Testelin Christophe
LR01ES15 Laboratoire de Physique des Matériaux: Structure et Propriétés, Faculté des Sciences de Bizerte, Université de Carthage, Bizerte 7021, Tunisia.
Institut des NanoSciences de Paris, CNRS UMR 7588, Sorbonne Université, F-75005 Paris, France.
Nanomaterials (Basel). 2021 Nov 13;11(11):3054. doi: 10.3390/nano11113054.
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.
由于其灵活的化学合成方法以及塑造纳米结构的能力，卤化铅钙钛矿已成为光电器件中极具潜力的材料。在此，我们研究了胶体无机卤化铅纳米片层中的激子带边态及其能级，特别是在薄准二维系统中介电效应的影响。我们使用了一个在存在库仑相互作用时包含带隙偏移和介电限制的模型。还推导了经介电效应修正的短程和长程贡献，从而实现了对立方相、四方相和正交相激子精细结构的完整建模。讨论了包括暗激子态和亮激子态在内的精细分裂结构，并与近期实验结果进行了比较，显示了限制和介电贡献的重要性。
