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arXiv 1407.0101cond-mat.mtrl-sci
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Cu2O基半导体合金的电子能带结构和双极电学性质

Electronic band structure and ambipolar electrical properties of Cu2O based semiconductor alloys

Vladan Stevanovic, Andriy Zakutayev, Stephan Lany

摘要:

通过合金化来调节光电特性对于半导体技术是必不可少的。目前,大多数使用等价和同构合金(例如,IV族和III-V族),但是当考虑通过混合异价和异质结构成分的更复杂的合金时,可以想象到新型功能材料的巨大且未开发的空间。真正的挑战在于定量预测这类复杂合金的性能,以指导其实验探索。我们开发了一种方法来预测的能带结构和电学性质的从头计算的组成依赖性,通过扩展传统的稀缺陷模型,以更高的(合金)浓度。考虑到合金的异价(镁,锌,镉)阳离子和等价的阴离子(S,硒)到CuO,我们预测的可调性的带隙能量和掺杂水平在很宽的范围内,包括从p型到n型的类型转换。Zn和Se取代的Cu 2 O的初始合成和表征支持缺陷模型,表明这些合金作为有前途的新型氧化物半导体材料。

英文摘要:

Tuning the opto-electronic properties through alloying is essential for semiconductor technology. Currently, mostly isovalent and isostructural alloys are used (e.g., group-IV and III-V), but a vast and unexplored space of novel functional materials is conceivable when considering more complex alloys by mixing aliovalent and heterostructural constituents. The real challenge lies in the quantitative property prediction for such complex alloys to guide their experimental exploration. We developed an approach to predict compositional dependence of both band-structure and electrical properties from ab-initio calculations by extending conventional dilute defect model to higher (alloy) concentrations. Considering alloying of aliovalent (Mg, Zn, Cd) cations and isovalent anions (S, Se) into Cu2O, we predict tunability of band-gap energies and doping levels over a wide range, including the type conversion from p- to n-type. Initial synthesis and characterization of Zn and Se substituted Cu2O support the defect model, suggesting these alloys as promising novel oxide semiconductor materials.

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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