arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.01449cond-mat.mtrl-sci
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硼砷化物异质结构:晶格匹配异质界面,应变对能带取向和迁移率的影响

Boron Arsenide Heterostructures: Lattice-Matched Heterointerfaces, and Strain Effects on Band Alignments and Mobility

Kyle Bushick, Sieun Chae, Zihao Deng, John Heron, Emmanouil Kioupakis

摘要:

BAs是具有超高热导率的III-V族半导体,但其许多电子性质尚不清楚。本工作采用预测原子计算来研究BAs异质结构的性质,如应变对能带排列和载流子迁移率的影响,考虑BAs作为晶格匹配材料的薄膜和衬底。结果表明,应变使带隙减小,与方向和符号无关。此外,双轴拉伸应变增加了面内电子和空穴迁移率超过60%相比,由于电子有效质量和空穴带间散射的减少的未应变值。此外,BAs被证明是近晶格匹配的InGaN和ZnSnN 2,两个重要的光电子半导体与可调带隙合金和阳离子无序,分别。结果预测II型带对齐,并确定这两种材料与BA的绝对带偏移。BAs的超高热导率和本征p型特性与其高电子和空穴迁移率(可通过拉伸应变进一步增加)以及与本征n型InGaN和ZnSnN 2的晶格匹配和II型能带对准的组合展示了BAs异质结构用于电子和光电子器件的潜力。

英文摘要:

BAs is III-V semiconductor with ultra-high thermal conductivity, but many of its electronic properties are unknown. This work applies predictive atomistic calculations to investigate the properties of BAs heterostructures, such as strain effects on band alignments and carrier mobility, considering BAs as both a thin film and a substrate for lattice-matched materials. The results show that strain decreases the band gap independent of sign or direction. In addition, biaxial tensile strain increases the in-plane electron and hole mobilities by more than 60% compared to the unstrained values due to a reduction of the electron effective mass and of hole interband scattering. Moreover, BAs is shown to be nearly lattice-matched with InGaN and ZnSnN2, two important optoelectronic semiconductors with tunable band gaps by alloying and cation disorder, respectively. The results predict type-II band alignments and determine the absolute band offsets of these two materials with BAs. The combination of the ultra-high thermal conductivity and intrinsic p-type character of BAs, with its high electron and hole mobilities that can be further increased by tensile strain, as well as the lattice-match and the type-II band alignment with intrinsically n-type InGaN and ZnSnN2 demonstrate the potential of BAs heterostructures for electronic and optoelectronic devices.

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