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arXiv 1803.04771cond-mat.mtrl-sci
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掺杂$p$型CuI的光电性质:透明导电性的第一性原理解释

Optical and Electronic Properties of Doped $p$-type CuI: Explanation of Transparent Conductivity from First Principles

Y. Li, J. Sun, D. J. Singh

摘要:

我们报告的透明导体CuI的性能,包括重$p$型掺杂的效果。基于第一性原理计算的结果,包括电子结构的分析和光学和介电性质的计算。我们发现,有利的透明导电行为的起源在于在可见光的情况下,较深的价带和状态之间的强带间跃迁的价带最大值,成为空与$p$型掺杂。相反,强烈的带间跃迁的价带最大值集中在红外与能量低于1.3 eV。这与许多宽带隙材料的价带形成对比。对于迁移率,我们发现在价带最大处的态是相对分散的。这源于它们的反键Cu $d$ -Ⅰ $p$特性.我们发现一个适度的增强玻恩有效电荷相对于标称值,导致介电常数$\varepsilon(0)$ =6.3。这是足够大的,以减少电离杂质散射,导致预期的性质的CuI仍然可以通过样品质量显着提高。

英文摘要:

We report properties of the reported transparent conductor CuI, including the effect of heavy $p$-type doping. The results, based on first principles calculations, include analysis of the electronic structure and calculations of optical and dielectric properties. We find that the origin of the favorable transparent conducting behavior lies in the absence in the visible of strong interband transitions between deeper valence bands and states at the valence band maximum that become empty with $p$-type doping. Instead, strong interband transitions to the valence band maximum are concentrated in the infrared with energies below 1.3 eV. This is contrast to the valence bands of many wide band gap materials. Turning to the mobility we find that the states at the valence band maximum are relatively dispersive. This originates from their antibonding Cu $d$ - I $p$ character. We find a modest enhancement of the Born effective charges relative to nominal values, leading to a dielectric constant $\varepsilon(0)$=6.3. This is sufficiently large to reduce ionized impurity scattering, leading to the expectation that the properties of CuI can be still can be significantly improved through sample quality.

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