DataVXACS PhotonicsPaper
journal article·2024-12-18

Multi-Mechanism Driven Ta2NiSe5–Graphene Heterojunction for Ultrabroadband Detection from Visible to Terahertz Spectrum

Yang Wu, Zhen-Zhi Hu, Zhao-Guo Liu, Huan-Li Zhou, Sheng Ni, Jing-Yuan Wu, Dan Su, Yuan-Jun Song, Changlong Liu, Xiao-Yang Zhang, Tong Zhang

ACS Photonics· Volume 11· Issue 12
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Source abstract

Abstract

Ultrabroadband photodetectors are essential for applications such as biomedical imaging, environmental assessment, optical data transmission, gas detection, and security monitoring. However, traditional semiconductor detectors are typically limited to detection within a single spectral range, and achieving ultrabroadband detection often requires integrating multiple detectors. This is particularly challenging in the terahertz range, where detection is constrained by high dark currents and the need for cryogenic cooling. As a result, expanding the detection range has become a critical focus in optoelectronic development. In this study, we successfully demonstrated ultrabroadband detection from the visible to terahertz spectrum at room temperature using a heterojunction formed by Ta 2 NiSe 5 and graphene, driven by multiple physical mechanisms. The detector leverages the combined effects of photoexcited electron–hole pairs and the photothermal response triggered by the asymmetry of the heterojunction, achieving responsivities of 4.8 mA/W at 638 nm, 3.8 mA/W at 1550 nm, 42.9 mA/W at 0.12 THz, and 14.6 mA/W at 0.3 THz. Additionally, the device achieves NEP values as low as 7 pW/Hz 1/2 at 0.12 THz and 23 pW/Hz 1/2 at 0.3 THz, with a response time of 7.4 μs at 0.12 THz. Our findings demonstrate a novel approach to ultrabroadband detection, achieving high sensitivity and fast response by leveraging multiple physical mechanisms. This work opens new avenues for the future development of optoelectronic detection technologies.
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Research context

NanomaterialsElectronic materials

OpenAlex topics: 2D Materials and Applications · Graphene research and applications · Gas Sensing Nanomaterials and Sensors

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Joint International Research Laboratory of Information Display and Visualization, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, China

Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology, Ministry of Education, School of Instrument Science and Engineering, Southeast University, Nanjing 210096, China

College of Physics and Optoelectronic Engineering, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China

Department of Optoelectronic Science and Engineering, College of Science, Donghua University, Shanghai 201620, China

Suzhou Key Laboratory of Metal Nano-Optoelectronic Technology, Southeast University Suzhou Campus, Suzhou 215123, China

Funding

National Key Research and Development Program of China · China Postdoctoral Science Foundation · Natural Science Foundation of Jiangsu Province · National Natural Science Foundation of China · Research Funds of Hangzhou Institute for Advanced Study, UCAS · Research Funds of Hangzhou Institute for Advanced Study · Zhejiang Provincial?Natural Science Foundation · Youth Special Award,?Excellent Postdoctoral Research Projects of Zhejiang Province · Hangzhou West Science and Technology Innovation Corridor Youth Project and Youth Special Award · Open Fund of State Key Laboratory of Infrared Physics · Zhejiang Provincial Natural Science Foundation

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