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arXiv 1210.0163cond-mat.mtrl-sciphysics.comp-ph
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纤锌矿Zn_{1-x} Cd_xO电子和光学性质的第一性原理研究

First-principles study of electronic and optical properties in wurtzite Zn_{1-x}Cd_xO

X. D. Zhang, M. L. Guo, W. X. Li, C. L. Liu

摘要:

第一性原理研究已经进行了评估的电子和光学性质的纤锌矿Zn 1-xCdxO的x=0.25。在密度泛函理论的框架内,我们采用了Perdew-Burke-Ernzerhof(PBE)形式的广义梯度近似。在不同的配置中进行了计算。随着Cd掺杂浓度的增加,Zn_(1-x)Cd_xO导带中s态的增加导致禁带宽度减小。介电函数虚部的计算结果表明,随着Cd掺杂浓度的增加,最高价带的O 2 p态和最低导带的Zn 4 s态之间的光学跃迁向低能区移动.此外,光学带隙从3.2到2.84 eV的增加镉浓度从0到0.25。同时,弯曲参数b,这已经通过拟合的光学带隙的结果得到,约为1.21 eV。讨论了纯ZnO和Zn0.75Cd0.25O的光学常数,如电导率、损耗函数、折射率和反射率。

英文摘要:

A first-principles study has been performed to evaluate the electronic and optical properties of wurtzite Zn1-xCdxO up to x=0.25. We have employed the Perdew-Burke-Ernzerhof (PBE) form of generalized gradient approximation within the framework of density functional theory (DFT). Calculations have been carried out in different configurations. With the increasing Cd concentrations, the band gap of Zn1-xCdxO is decreased due to the increase of s states in conduction band. The results of imaginary part of dielectric function indicate that the optical transition between O 2p states in the highest valence band and Zn 4s states in the lowest conduction band has shifted to low energy range as the Cd concentrations increase. Besides, the optical band gap decreases from 3.2 to 2.84 eV with increasing Cd concentrations from 0 to 0.25. Meanwhile, the bowing parameter b, which has been obtained by fitting the results of optical band gap, is about 1.21 eV. The optical constants of pure ZnO and Zn0.75Cd0.25O, such as optical conductivity, loss function, refractive index and reflectivity, have been discussed.

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