arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2109.06307cond-mat.mtrl-sci
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通过硼和氮掺杂原子与2D单层氧化铍的相互作用驱动的高热电和光导性

High thermoelectric and optical conductivity driven by the interaction of Boron and Nitrogen dopant atoms with a 2D monolayer Beryllium Oxide

Nzar Rauf Abdullah, Botan Jawdat Abdullah, Vidar Gudmundsson

摘要:

采用密度泛函理论计算方法研究了硼(B)和氮(N)共掺杂BeO单层膜的电子、热学和光学性质。我们的计算表明,与BN共掺杂原子的BeO可以产生更有效的和出色的性能的热响应和光学响应。更重要的是,单层BeO与BN共掺杂原子成为一个直接带隙的半导体相比,原始BeO的绝缘体行为。这项工作的特别注意的是支付的原子配置和B和N掺杂剂原子与BeO的相互作用的影响。B和N原子与BeO单层的相互作用减少了简并能态,形成平带。研究还发现,O和N原子之间存在强吸引力,形成强σ键,打破了BeO结构的对称性。因此,带隙减小,导致半导体行为具有改善的热电性质,例如塞贝克系数和品质因数。减小的带隙和平坦的能带在可见光区域引起高的光学响应,例如折射率、反射率和光学电导率。此外,单层BeO与B和N原子的各向异性关于不同方向的电磁极化。我们期望我们的研究结果可以用于热电和光电子器件的设计。

英文摘要:

The electronic, thermal and optical properties of a monolayer BeO with Boron (B) and Nitrogen (N) co-dopant atoms are studied by means of a density functional theory computation. Our calculations reveal that BeO with BN-codopant atoms can give rise to more effective and outstanding performance for the thermal and optical responses. More significantly, the monolayer BeO with BN codopant atoms becomes a semiconductor with a direct band gap in comparison with the insulator behavior of pristine BeO. The particular attention of this work is paid to the influence of the atomic configuration and the interaction of the B and N dopant atoms with BeO. The interaction of the B and N atoms with the BeO monolayer diminishes degenerate energy states forming flat bands. It is also found that there is a strong attractive interaction between the O and N atoms forming a strong sigma bond breaking the symmetry of BeO structure. Consequently, the band gap is reduced leading to a semiconductor behavior with improved thermoelectric properties such as the Seebeck coefficient and the figure of merit. The reduced band gap and the flat bands induce a high optical responses such as the refractive index, the reflectivity and the optical conductivity in the visible light region. In addition, the anisotropy of a monolayer BeO with B and N atoms regarding different direction of electromagnetic polarization is presented. We anticipate that our results can be useful for design of both thermoelectric and optoelectronic devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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