Disorder and its impact on mobility of undoped GaN

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2024-11-21 DOI:10.1063/5.0244197

Robert A. Makin, Andrew S. Messecar, Steven M. Durbin

引用次数: 0

Abstract

While it is widely appreciated that disorder is intricately related to observed sample-to-sample variation in property values, outside of very specialized cases, analysis is often qualitative in nature. One well-understood quantitative approach is based on the 1930s work of Bragg and Williams, who established an order parameter S, which ranges from unity in the case of a perfectly ordered structure to zero in the case of a completely randomized lattice. Here, we demonstrate that this order parameter is directly related to charge carrier mobility in undoped GaN. Extrapolating experimental points yields a value of 1640 cm2/Vs for the maximum room temperature mobility in stoichiometric material, with higher values potentially accessible for Ga-rich material. Additionally, we present a model for observed trends in carrier concentration based on the occurrence of distinct structural motifs, which underpin S. The result is an alternative perspective for the interplay between lattice structure and charge carriers that enables a predictive model for tuning mobility and carrier concentration in undoped material.

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无序及其对未掺杂氮化镓迁移率的影响

虽然人们普遍认为无序与所观察到的样本间属性值的变化密切相关，但除了非常特殊的情况外，分析通常都是定性的。一种广为人知的定量分析方法是基于布拉格和威廉姆斯在 20 世纪 30 年代的研究成果，他们建立了一个有序参数 S，其范围从完全有序结构的统一到完全无序晶格的零。在这里，我们证明了这个有序参数与未掺杂氮化镓中的电荷载流子迁移率直接相关。对实验点进行外推，可得出化学计量材料的最大室温迁移率值为 1640 cm2/Vs，而富含镓的材料可能会达到更高的值。此外，我们还提出了一个基于不同结构图案的载流子浓度观测趋势模型，该结构图案是 S 的基础。结果从另一个角度说明了晶格结构与电荷载流子之间的相互作用，从而为调整未掺杂材料中的迁移率和载流子浓度提供了一个预测模型。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.