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Hydrogenic impurity states in the spherical CdSe/ZnS/ CdSe nanoheterostructure

机译：球形CdSe / ZnS / CdSe纳米异质结构中的氢杂质态

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摘要

To study the optical properties of a medium with an ensemble of quantum dots (QDs) it is necessary to clarify properties of a single dot. We investigated the influence of increasing core and shell size on the states energy for a single spherical CdSe/ZnS/CdSe core-shell QD, in the presence of the hydrogenic impurity located in the center. Investigated nanoheterosystem behaves as quantum antidot for particular geometry. Calculations of the hydrogenic impurity discrete states in the spherical semiconductor multilayered nanoheterosystem are performed under effective mass approximation by assuming a spherically symmetric confining potential of finite depth. On the basis of the analytical solutions of the Scrodinger and Poisson equations for QD with hydrogenic impurity located in the center, energy of discrete states and corresponding wave functions for CdSe/ZnS/CdSe QD are determined. Energies of 1s, 2s, 3s, 2p, 3p, and 3d states, and radial probabilities, that illustrate spatial charge distribution, are presented in this paper. Behavior of 1s is the most prominent. For small core radius 1s orbital expands out of the dot with energy below the bottom of the outer material conduction band i.e. core material in this particular case. When core radius increases energy increases and at characteristic core dimension, 1s orbital contracts into the core region and the ground state energy decreases till it reaches constant value, characteristic for core material.
机译：为了研究具有量子点（QD）集合体的介质的光学特性，有必要弄清单个点的特性。我们研究了增加的核和壳尺寸对单个球形CdSe / ZnS / CdSe核-壳QD在中心处存在氢杂质的存在下对态能的影响。研究的纳米异质系统表现为特定几何形状的量子解毒剂。通过假设有限深度的球对称约束势，在有效质量近似下，可以计算球形半导体多层纳米异质体系中氢杂质的离散态。根据含氢杂质位于中心的QD的Scrodinger和Poisson方程的解析解，确定CdSe / ZnS / CdSe QD的离散态能量和相应的波函数。本文介绍了1s，2s，3s，2p，3p和3d状态的能量，以及说明空间电荷分布的径向概率。 1s的行为最为突出。对于较小的芯半径1s，轨道以低于外部材料导带（即在这种特殊情况下的芯材料）底部的能量从点扩展出点。当芯半径增加时，能量增加，并且在芯的特征尺寸处，1s的轨道收缩到芯区域中，基态能量减小直至达到恒定值，这是芯材料的特征。

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