Competing self-trapped hole release and deep-level defect recombination in Ga2O3 photodetectors

IF 3.8 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2026-10-05 DOI:10.1063/5.0349846

Shuaihang Xu,Qingxuan Sun,Jiahao Liao,Changjie Zhou,Huili Zhu,Cunzhi Sun,Weifeng Yang

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引用次数: 0

Abstract

Defects determine the photoresponse of β-Ga2O3 photodetectors, yet the interplay between self-trapped holes and deep-level recombination centers remains poorly understood. In this work, plasma-assisted molecular-beam epitaxy produced a (-201)-oriented film on sapphire with a sharp interface and a (400)-oriented film on 4H-SiC with an amorphous SiOx interlayer. Structural and spectroscopic measurements show markedly different dislocation and oxygen-vacancy signatures in these two heteroepitaxial systems. For the (-201)-oriented PD, the photocurrent decreased as the temperature rose to 150 °C and then partially recovered at 200 °C, driven by the thermal activation of the release of self-trapped holes. In contrast, the (400)-oriented photodetector showed a steady decrease in photocurrent, as deep-level recombination centers effectively suppressed the contribution from the release of self-trapped holes. Furthermore, the higher defect density in the (400)-oriented photodetector leads to faster response times, owing to enhanced non-radiative recombination through deep-level centers.

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Ga2O3光电探测器中的竞争自困空穴释放和深能级缺陷复合

缺陷决定了β-Ga2O3光电探测器的光响应，但自困空穴与深层复合中心之间的相互作用仍然知之甚少。在这项工作中，等离子体辅助分子束外延在具有尖锐界面的蓝宝石上制备了（-201）取向薄膜，在具有非晶SiOx中间层的4H-SiC上制备了（400）取向薄膜。结构和光谱测量表明，这两种异质外延体系的位错和氧空位特征明显不同。对于（-201）取向的PD，当温度升高到150℃时，光电流下降，在200℃时，光电流部分恢复，这是由于自困孔释放的热激活驱动。相比之下，（400）取向光电探测器显示出稳定的光电流下降，因为深层复合中心有效地抑制了自困孔释放的贡献。此外，（400）取向光电探测器中较高的缺陷密度导致更快的响应时间，这是因为通过深能级中心增强了非辐射复合。

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.