In situ construction of CuInSe2–In2Se3 heterojunctions for highly selective self-powered NO2 sensors

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-09-30 DOI:10.1063/5.0289490

Hao Jiang, Shilei Fan, Xiao Chang, Xianghong Liu, Wei Zheng, Jun Zhang

引用次数: 0

Abstract

Self-powered gas sensors are crucial for sustainable IoT systems but remain limited by detection thresholds, selectivity, and scalable fabrication methods. To overcome transfer-induced performance degradation in conventional fabrication of transition metal dichalcogenide (TMD) heterojunctions, herein we propose a direct in situ solid-phase conversion strategy to monolithic two-dimensional (2D) CuInSe2–In2Se3 thin-film heterojunctions. Under UV irradiation (365 nm), the heterojunction device exhibits self-powered operation with excellent selectivity and ultrafast response kinetics (2.36 s) toward 5 ppm NO2 at room temperature, with sensitivity comparable to that of leading-edge self-powered sensors. Significantly, our strategy eliminates the need for mechanical exfoliation and transfer steps, thereby ensuring robust device performance. This work offers perspectives on the rational design of planar heterojunctions for next-generation self-powered gas sensors, which are characterized by high performance, low cost, and energy efficiency.

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高选择性自供电NO2传感器中CuInSe2-In2Se3异质结的原位构建

自供电气体传感器对于可持续物联网系统至关重要，但仍然受到检测阈值、选择性和可扩展制造方法的限制。为了克服传统制造过渡金属二硫化物（TMD）异质结中转移引起的性能下降，本文提出了一种直接原位固相转换策略，以形成单片二维（2D） CuInSe2-In2Se3薄膜异质结。在365 nm紫外光照射下，异质结器件表现出优异的选择性和超快的响应动力学（2.36 s），室温下对5 ppm NO2的响应动力学，灵敏度可与前沿的自供电传感器相媲美。值得注意的是，我们的策略消除了机械剥离和转移步骤的需要，从而确保了稳健的设备性能。本研究为高性能、低成本、高能效的下一代自供电气体传感器提供了平面异质结的合理设计思路。

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.