Charge-state control of carbon-related optical absorption in AlN

IF 3.8 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2026-08-31 DOI:10.1063/5.0347879

Helen C. Robinson,Daniil Danilin,Md. Shafiqul Islam Mollik,Darshana Wickramaratne,John L. Lyons,Vladimir Fedorov,Sergey Mirov,M. E. Zvanut

引用次数: 0

Abstract

Sub-bandgap optical absorption (OA) in AlN between 2 and 4 eV is widely observed, but its microscopic origin remains contested. Using photo-induced electron paramagnetic resonance (photo-EPR) and OA spectroscopy on the same samples, we demonstrate a correlation between this absorption band and the neutral charge state of substitutional carbon on the nitrogen site (CN). Hybrid functional calculations of the OA spectra show that a transition involving CN and the valence band occurs near 3.3 eV, which agrees well with a peak identified within the measured OA between 2 and 4 eV. This conclusion requires the combined ability to manipulate the charge state of carbon using photo-EPR and to use first-principles calculations of the absorption line shape that account for the dispersion of the valence band and the energy dependence of the optical matrix elements.

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AlN中碳相关光吸收的电荷态控制

亚带隙光学吸收（OA）在2 ~ 4ev之间的AlN中被广泛观察到，但其微观起源仍有争议。利用光诱导电子顺磁共振（photo-EPR）和OA光谱对同一样品进行分析，我们证明了该吸收带与氮位（CN）上取代碳的中性电荷状态之间的相关性。OA光谱的混合泛函计算表明，在3.3 eV附近发生了涉及CN和价带的跃迁，这与测量到的OA在2和4 eV之间的峰一致。这个结论需要结合使用光- epr来操纵碳的电荷状态的能力，并使用吸收线形状的第一性原理计算来解释价带的色散和光学矩阵元素的能量依赖。

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.