DataVXAdvanced MaterialsPaper
journal article·2023-11Open access

Mid‐Infrared Bipolar and Unipolar Linear Polarization Detections in Nb2GeTe4/MoS2 Heterostructures

Jiayue Han, Fakun Wang, Yue Zhang, Wenjie Deng, Mingjin Dai, Fangchen Hu, Wenduo Chen, Jieyuan Cui, Chaoyi Zhang, Song Zhu, Chongwu Wang, Ming Ye, Song Han, Yu Luo, Tianyou Zhai, Jun Wang, Qi Jie Wang

Advanced Materials· Volume 35· Issue 46
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Source abstract

Abstract

Abstract Detecting and distinguishing light polarization states, one of the most basic elements of optical fields, have significant importance in both scientific studies and industry applications. Artificially fabricated structures, e.g., metasurfaces with anisotropic absorptions, have shown the capabilities of detecting polarization light and controlling. However, their operations mainly rely on resonant absorptions based on structural designs that are usually narrow bands. Here, a mid‐infrared (MIR) broadband polarization photodetector with high PRs and wavelength‐dependent polarities using a 2D anisotropic/isotropic Nb2GeTe4/MoS2 van der Waals (vdWs) heterostructure is demonstrated. It is shown that the photodetector exhibits high PRs of 48 and 34 at 4.6 and 11.0 µm wavelengths, respectively, and even a negative PR of −3.38 for 3.7 µm under the zero bias condition at room temperature. Such interesting results can be attributed to the superimposed effects of a photovoltaic (PV) mechanism in the Nb2GeTe4/MoS2 hetero‐junction region and a bolometric mechanism in the MoS2 layer. Furthermore, the photodetector demonstrates its effectiveness in bipolar and unipolar polarization encoding communications and polarization imaging enabled by its unique and high PRs.
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Research context

Electronic materials

OpenAlex topics: 2D Materials and Applications · Chalcogenide Semiconductor Thin Films · Advanced Semiconductor Detectors and Materials

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

Affiliations

Center for Optoelectronics and Biophotonics School of Electrical & Electronic Engineering Nanyang Technological University Singapore 639798 Singapore

School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu 610054 P. R. China

State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China

Key Laboratory of Optoelectronics Technology Ministry of Education Faculty of Information Technology Beijing University of Technology Beijing 100124 P. R. China

Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU‐Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou 310027 P. R. China

School of Physical and Mathematical Science, and Photonics Institute Nanyang Technological University Singapore 639798 Singapore

Funding

Agency for Science, Technology and Research · National Medical Research Council · China Scholarship Council · National Natural Science Foundation of China · National Research Foundation Singapore

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