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arXiv 1409.0459cond-mat.mtrl-sci
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氧磷烯:一种新型二维材料的稳定性和电子性质

Phosphorene Oxide: Stability and electronic properties of a novel 2D material

Gaoxue Wang, Ravindra Pandey, Shashi P. Karna

摘要:

磷烯,(黑)磷的单层形式,最近从其大块对应物剥离。与氧化石墨烯类似,氧化磷烯有望具有新的化学和电子性质,并可能提供合成磷烯的替代途径。在这封信中,我们调查的物理和化学性质的磷烯氧化物,包括其形成的氧吸附在裸磷烯。声子色散曲线的分析发现化学计量和非化学计量的氧化物配置是稳定的,在环境条件下,从而表明氧的吸收可能不会降解磷烯。的氧化物的带隙的性质取决于磷烯的官能化的程度;间接间隙预测为非化学计量的配置,而直接间隙预测为化学计量的氧化物。机械应变和外部电场的应用导致磷烯氧化物的带隙的可调谐性。与裸磷烯的情况相反,预测磷烯氧化物的二极管样不对称电流-电压响应对化学计量的程度的依赖性。

英文摘要:

Phosphorene, the monolayer form of the (black) phosphorus, was recently exfoliated from its bulk counterpart. Phosphorene oxide, by analogy to graphene oxide, is expected to have novel chemical and electronic properties, and may provide an alternative route to synthesis of phosphorene. In this letter, we investigate physical and chemical properties of the phosphorene oxide including its formation by the oxygen adsorption on the bare phosphorene. Analysis of the phonon dispersion curves finds stoichiometric and non-stoichiometric oxide configurations to be stable at ambient conditions, thus suggesting that the oxygen absorption may not degrade the phosphorene. The nature of the band gap of the oxides depends on the degree of the functionalization of phosphorene; indirect gap is predicted for the non-stoichiometric configurations whereas a direct gap is predicted for the stoichiometric oxide. Application of the mechanical strain and external electric field leads to tunability of the band gap of the phosphorene oxide. In contrast to the case of the bare phosphorene, dependence of the diode-like asymmetric current-voltage response on the degree of stoichiometry is predicted for the phosphorene oxide.

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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