High-performance, reliable and self-powered solar-blind photodetectors based on GQDs/α-Ga2O3 heterojunctions

IF 5.7 2区 材料科学 Q2 CHEMISTRY, PHYSICAL Surfaces and Interfaces Pub Date : 2025-02-27 DOI:10.1016/j.surfin.2025.106122
Chunlin Wen , Zhenhua Tang , Tingsu Liu , Fan Qiu , Yan-Ping Jiang , Xin-Gui Tang , Yi-Chun Zhou , Xiangjun Xing , Ju Gao
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Abstract

Recently, Ga2O3-based devices with a wide bandgap have gained great attention in power semiconductor devices. However, Ga2O3-based devices with the substable crystalline phase and high performances need be further developed and discussed. In this work, the α-Ga2O3 thin films and GQDs/α-Ga2O3 heterojunctions were prepared by magnetron sputtering on the transparent FTO substrates with a buffer TiO2 layer. And, the good self-powered deep-ultraviolet photodetection performance and mechanisms were discussed in the GQDs/α-Ga2O3/α-TiO2/FTO devices: its responsivity to 254 nm UV light can reach 1.72 mA/W at a bias voltage of 0 V, a normalized detection rate of 1.7 × 1010 Jones and the light-to-dark current ratio (PDCR) of ∼1 were achieved due to the change of heterojunction energy band type from II to I. Moreover, the good self-powered deep UV photodetection for GQDs/α-Ga2O3/α-TiO2/FTO devices were demonstrated: a PDCR of 1.1 × 103, a self-powered responsivity (R) improved by a factor of 5 to 8.7 mA/W, the rise time (τr)/fall time (τf) of 86/39 ms, and a normalized detectivity (D*) with an improved magnitude of 1.3 to 2.3 × 1011 Jones were achieved by constructing GQDs/α-Ga2O3 heterojunctions on the outer surface of α-Ga2O3 thin film. These results can provide a reference for the future development of Ga2O3 thin film devices.

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来源期刊
Surfaces and Interfaces
Surfaces and Interfaces Chemistry-General Chemistry
CiteScore
8.50
自引率
6.50%
发文量
753
审稿时长
35 days
期刊介绍: The aim of the journal is to provide a respectful outlet for ''sound science'' papers in all research areas on surfaces and interfaces. We define sound science papers as papers that describe new and well-executed research, but that do not necessarily provide brand new insights or are merely a description of research results. Surfaces and Interfaces publishes research papers in all fields of surface science which may not always find the right home on first submission to our Elsevier sister journals (Applied Surface, Surface and Coatings Technology, Thin Solid Films)
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