Electronic states of elongated PbSe/PbS Core/shell quantum dots

4th Workshop on Theory, Modelling and Computational Methods for Semiconductors

物理学;计算机科学

Walsh, T.^1 ; Miloszewski, J.^1 ; Aeberhard, U.^2 ; Tomic´, S.^1

University of Salford, Greater Manchester, United Kingdom^1

IEK-5 Photovoltaik, Forschungszentrum Jülich, Germany^2

关键词: Colloidal quantum dots;    Core/shell quantum dots;    Core/shell structure;    Dipole transition;    Empirical pseudo-potential;    Optical characteristics;    Physical geometry;    Solar cell technology;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/526/1/012010/pdf
DOI  :  10.1088/1742-6596/526/1/012010

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

The optical characteristics of colloidal quantum dots (QDs) are highly dependent on the physical geometry of the QD (size, shape) as well as composition. These dependencies make such systems attractive for application in novel optical devices, notably for solar cell technology. Empirical electronic structure methods, such as k·p theory, or empirical pseudopotential theories have successfully reproduced experimentally observed transitions in CdSe and PbSe colloidal QDs. Our approach uses the k·p method to predict such properties as the electronic structure and dipole transitions of ellipsoidal PbSe/PbS core/shell structure colloidal QDs, as a function of eccentricity. Due to the anisotropy between the longitudinal (z) and transverse (x and y) directions, we present results from elongation along both the x and z directions.