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arXiv 2204.08652cond-mat.mtrl-sci
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氧空位缺陷对$MgO$单分子膜电学和光学性质影响的第一性原理研究

Effect of Oxygen Vacancy Defects on Electronic and Optical Properties of $MgO$ Monolayers: First Principles Study

Rituparna Hazarika, Bulumoni Kalita

摘要:

用密度泛函理论的混合水平研究了MgO(111)单分子膜中氧空位缺陷引起的光电性质。HSE计算表明,由于引入氧空位,MgO单层的电子带隙显着减少。原始单分子膜具有宽带隙(4.84 eV,间接)半导体行为,当氧空位缺陷浓度分别增加6.25%和12.5%时,带隙分别变为2.97 eV(间接)和2.28 eV(直接)。因此,氧空位的存在导致能量红移的观察到的光学现象与原始单层。最重要的是,具有两个连续空位的双空位系统显示出最强的光学吸收,并且在电磁波谱中从可见光到紫外区域的光谱范围内也变得光学响应。因此,在MgO单层中产生氧钒可能是获得合适的太阳能材料的富有成效的技术。

英文摘要:

The optoelectronic properties induced by oxygen vacancy defects in MgO(111) monolayers have been studied using hybrid level of DFT method. HSE calculations shows significant reduction in electronic band gap of MgO monolayer as a result of introduction of oxygen vacancies. The pristine monolayer has a wide band gap (4.84 eV, indirect) semiconducting behaviour, which changes gap to 2.97 eV (indirect) and 2.28 eV (direct) with increment in oxygen vacancy defect concentration of 6.25% and 12.5%,respectively. Consequently, presence of oxygen vacancies leads to energy red shift of the observed optical phenomena with reference to the pristine monolayer. Most importantly, the divacancy system with two consecutive vacancy sites displays the strongest optical absorption and also becomes optically responsive over the spectral range from visible to ultraviolet region in the electromagnetic spectrum. Thus creation of oxygen vancancies in MgO monolayers may be a fruitful technique for achieving a suitable solar energy material.

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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