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arXiv 2012.11229cond-mat.mtrl-sci
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置换掺杂$β$ $_2$ O $_3$的压电性能

Piezoelectric properties of substitutionally doped $β$-Ga$_2$O$_3$

Lijie Li

摘要:

现代半导体材料越来越多地用于多学科系统中,展示了机械应变和电子势之间的交叉相互作用,这使得高灵敏度,自供电传感器设备中的应用无处不在。这种半导体材料表现出压电性能的基本前提之一是晶体结构的非中心对称性。$β$ -Ga $_2$ O $_3$由于其超宽带隙而成为一种新兴的化合物半导体材料。然而,原始的$β$ -Ga $_2$ O $_3$具有反转中心,没有显示出压电效应.本工作利用第一性原理方法发现,替位掺杂的$β$ $_2$ O $_3$具有压电性质,而以往对其替位掺杂的研究主要集中在提高电导率和形成半导体异质结方面。更有趣的是,它是从这项工作揭示了形成能有一个明确的关系与压电系数。

英文摘要:

Modern semiconductor materials are increasingly used in multidisciplinary systems demonstrating cross-interactions between mechanical strains and electronic potentials, which gives rise to ubiquitous applications in high sensitivity, self-powered sensor devices. One of fundamental prerequisites for such semiconductor materials to exhibit piezoelectric properties is the noncentrosymmetry of the crystal structures. $β$-Ga$_2$O$_3$ has been an emerging compound semiconductor material due to its ultra-wide bandgap. However the pristine $β$-Ga$_2$O$_3$ has an inversion center, displaying no piezoelectric effect. This work discovered that substitutionally doped $β$-Ga$_2$O$_3$ possesses piezoelectric property by using first principles method, while majority of previous research on its substitutional doping has been focusing on the purposes of increasing electrical conductivity and formation of the semiconductor heterojunctions. More interestingly, it is unveiled from this work that the formation energy has a clear relation with the piezoelectric coefficient.

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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