Fast speed UV photodetector with high responsivity based on ZnO/MgZnO core–shell nanowires

IF 3.8 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2026-08-31 DOI:10.1063/5.0335549

Jiahao Zhang,Jian Chu,Luhua Chen,Xiangzhe Zeng,Yang Zhang,Yi Wang,Jinhui Song

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引用次数: 0

Abstract

Ultraviolet (UV) photodetectors based on zinc oxide (ZnO) wide-bandgap semiconductors have been intensively explored for applications in environmental monitoring, optical communication, and biosensing. However, conventional ZnO-based photodetectors often suffer from limited responsivity and relatively slow photoresponse speeds, which severely restrict their practical applications. Herein, we report a highly sensitive and fast-responsive photodetector based on ZnO/MgZnO core–shell radial-heterostructured nanowires (NWs) through radial interface engineering. The introduction of a wider bandgap MgZnO shell onto ZnO NWs forms a radial ZnO/MgZnO heterojunction, which introduces a built-in electric field that effectively promotes the separation and collection of photogenerated carriers. The optimized device exhibits a fast response time of 0.41/2.30 s (rise/decay) and a high responsivity of 0.75 A/W at zero bias. Furthermore, this study reveals a nonlinear relationship between the MgZnO shell thickness and the photoresponsivity of the device, and identifies the optimal MgZnO shell thickness for optimizing device performance. These results demonstrate that core–shell heterointerface engineering is an effective strategy for balancing responsivity and response speed in ZnO-based UV photodetectors.

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基于ZnO/MgZnO核壳纳米线的高速高响应紫外光电探测器

基于氧化锌（ZnO）宽禁带半导体的紫外（UV）光电探测器在环境监测、光通信和生物传感等领域的应用得到了广泛的探索。然而，传统的zno基光电探测器往往存在响应性有限和光响应速度相对较慢的问题，严重制约了其实际应用。本文报道了一种基于ZnO/MgZnO核壳径向异质结构纳米线（NWs）的高灵敏度、快速响应的光电探测器。在ZnO NWs上引入更宽带隙的MgZnO壳，形成径向ZnO/MgZnO异质结，引入内置电场，有效促进光生载流子的分离和收集。优化后的器件具有0.41/2.30 s（上升/衰减）的快速响应时间和0.75 a /W的零偏响应率。此外，本研究揭示了MgZnO壳厚度与器件光响应性之间的非线性关系，并确定了优化器件性能的最佳MgZnO壳厚度。这些结果表明，核壳异质界面工程是平衡zno基紫外探测器的响应性和响应速度的有效策略。

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.