Ab initio characterization of the electronic properties of PbTe quantum dots embedded in a CdTe matrix

作者：Leitsmann R^*; Bechstedt F

来源：Semiconductor Science and Technology, 2011, 26(1): 014005.

DOI：10.1088/0268-1242/26/1/014005

The electronic properties of PbTe nanocrystals (NCs) embedded in a CdTe matrix are investigated using an ab initio pseudopotential method and a repeated supercell approximation. The asymmetric distribution of polar dot-matrix interfaces leads to the presence of an electrostatic field within the NC region. The consequences of this field on the electronic properties of the dot-matrix system are discussed in detail. The resulting spatial separation of electrons and holes inside the NC region gives rise to a quantum-confined Stark effect. It influences the photoluminesence of the NCs.

• 出版日期2011-1