Electrical properties of completely compensated single-crystal Ge-on-GaAs films with two-dimension Coulomb disorder

IF 2.1 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER Solid State Communications Pub Date : 2024-10-16 DOI:10.1016/j.ssc.2024.115726

引用次数: 0

Abstract

We present electrical properties of heavily doped and completely compensated Ge films grown on semiinsulating GaAs(100) substrates by vacuum evaporation. The thin (∼100 nm) Ge films are single-crystal and characterized using temperature-dependent transport measurements, with anomalously large activation energy up to half the Ge bandgap, anisotropy of the transverse magnetoresistance, high resistivity (up to 140 Ω cm), low free charge carrier mobility (∼50 cm²/V·s), and concentration (∼10¹⁴–10¹⁵ cm⁻³). This behaviour is attributed to a completely compensated semiconductors arising from Ga and As impurity incorporation and large-scale potential fluctuations. Analysis suggests a two-dimensional percolative transport mechanism in Ge-on-GaAs heterostructures.

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具有二维库仑无序的完全补偿型砷化镓单晶薄膜的电学特性

我们介绍了通过真空蒸发在半绝缘 GaAs（100）衬底上生长的重掺杂和完全补偿 Ge 薄膜的电学特性。这些薄（∼100 nm）的 Ge 薄膜是单晶体，并通过温度相关的输运测量进行了表征，具有异常大的活化能（达到 Ge 带隙的一半）、横向磁阻的各向异性、高电阻率（高达 140 Ω cm）、低自由电荷载流子迁移率（∼50 cm2/V-s）和浓度（∼1014-1015 cm-3）。这种行为归因于掺入镓和砷杂质以及大规模电位波动所产生的完全补偿半导体。分析表明，Ge-on-GaAs 异质结构中存在一种二维渗流传输机制。

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来源期刊

Solid State Communications 物理-物理：凝聚态物理

CiteScore

3.40

自引率

4.80%

发文量

287

审稿时长

51 days

期刊介绍： Solid State Communications is an international medium for the publication of short communications and original research articles on significant developments in condensed matter science, giving scientists immediate access to important, recently completed work. The journal publishes original experimental and theoretical research on the physical and chemical properties of solids and other condensed systems and also on their preparation. The submission of manuscripts reporting research on the basic physics of materials science and devices, as well as of state-of-the-art microstructures and nanostructures, is encouraged. A coherent quantitative treatment emphasizing new physics is expected rather than a simple accumulation of experimental data. Consistent with these aims, the short communications should be kept concise and short, usually not longer than six printed pages. The number of figures and tables should also be kept to a minimum. Solid State Communications now also welcomes original research articles without length restrictions. The Fast-Track section of Solid State Communications is the venue for very rapid publication of short communications on significant developments in condensed matter science. The goal is to offer the broad condensed matter community quick and immediate access to publish recently completed papers in research areas that are rapidly evolving and in which there are developments with great potential impact.