Self-Powered Broadband UV-NIR Polarization-Sensitive Photodetector Based on Unipolar van der Waals Heterostructure

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Applied Materials & Interfaces Pub Date : 2025-05-20 DOI:10.1021/acsami.5c01752

Wei Gan, Ming Li, Chentao Zhang, Guanghui Peng, Ziyi Cao, Zheng Chen, Yun Li, Chuanqiang Wu, Xue Liu, Li Song

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Abstract

van der Waals heterostructures (vdWH) composed of two-dimensional (2D) materials have demonstrated significant potential in new-generation multifunctional photodetectors. Herein, we demonstrate a self-powered broadband polarization-sensitive photodetector with high efficiency and ultrafast response speed based on 2D MoS₂/Ta₂NiSe₅ vdWH, which is due to the unilateral depletion region formed at the n–n junction. Under 638 nm laser illumination, the as-fabricated 2D MoS₂/Ta₂NiSe₅ vdWH photodetector exhibits remarkable photoresponse, including high responsivity (R) of 1382 A/W, large specific detectivity (D*) of 6.59 × 10¹³ cm Hz^1/2 W^–1, and impressive external quantum efficiency (EQE) of 2.7 × 10⁵ %, together with ultrafast response time of ∼3 μs. Additionally, the device shows prominent photovoltaic effects with a short-circuit current of 27.4 nA, an open-circuit voltage of 0.28 V, and a maximum output electrical power (P_el) of 1.85 nW, respectively, as well as remarkable self-powered photodetection performance. Interestingly, the device showcases a broadband photoresponse ranging from UV-NIR both under biased and unbiased conditions. Notably, the device also exhibits a robust polarization ratio (PR) of up to 2.89. This study highlights the potential applications of self-powered, broadband, and polarization-sensitive photodetectors based on unipolar vdWH.

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基于单极范德华异质结构的自供电宽带紫外-近红外偏振敏感光电探测器

二维（2D）材料组成的范德华异质结构（vdWH）在新一代多功能光电探测器中显示出巨大的潜力。在此，我们基于二维MoS2/Ta2NiSe5 vdWH，展示了一种具有高效率和超快响应速度的自供电宽带偏振敏感光电探测器，这是由于在n-n结处形成的单边耗尽区。在638 nm激光照射下，制备的二维MoS2/Ta2NiSe5 vdWH光电探测器表现出优异的光响应，具有1382 A/W的高响应率(R)、6.59 × 1013 cm Hz1/2 W - 1的大比探测率（D*）、2.7 × 105 %的外量子效率（EQE）和~ 3 μs的超快响应时间。此外，该器件具有突出的光伏效应，短路电流为27.4 nA，开路电压为0.28 V，最大输出功率（Pel）分别为1.85 nW，并具有出色的自供电光电检测性能。有趣的是，该设备在偏置和无偏置条件下都显示出从紫外到近红外的宽带光响应。值得注意的是，该器件还具有高达2.89的稳健极化比（PR）。这项研究强调了基于单极vdWH的自供电、宽带和偏振敏感光电探测器的潜在应用。

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来源期刊

ACS Applied Materials & Interfaces 工程技术-材料科学：综合

CiteScore

16.00

自引率

6.30%

发文量

4978

审稿时长

1.8 months

期刊介绍： ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.