Please use this identifier to cite or link to this item: https://doi.org/10.1038/s41467-020-20115-1
Title: Zero-bias mid-infrared graphene photodetectors with bulk photoresponse and calibration-free polarization detection
Authors: Wei, Jingxuan 
Li, Ying
Wang, Lin 
Liao, Wugang 
Dong, Bowei 
Xu, Cheng 
Zhu, Chunxiang 
Ang, Kah-Wee 
Qiu, Cheng-Wei 
Lee, Chengkuo 
Keywords: Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
PHOTOCURRENT
GENERATION
EFFICIENCY
LIMIT
Issue Date: 17-Dec-2020
Publisher: NATURE RESEARCH
Citation: Wei, Jingxuan, Li, Ying, Wang, Lin, Liao, Wugang, Dong, Bowei, Xu, Cheng, Zhu, Chunxiang, Ang, Kah-Wee, Qiu, Cheng-Wei, Lee, Chengkuo (2020-12-17). Zero-bias mid-infrared graphene photodetectors with bulk photoresponse and calibration-free polarization detection. NATURE COMMUNICATIONS 11 (1). ScholarBank@NUS Repository. https://doi.org/10.1038/s41467-020-20115-1
Abstract: Bulk photovoltaic effect (BPVE), featuring polarization-dependent uniform photoresponse at zero external bias, holds potential for exceeding the Shockley-Queisser limit in the efficiency of existing opto-electronic devices. However, the implementation of BPVE has been limited to the naturally existing materials with broken inversion symmetry, such as ferroelectrics, which suffer low efficiencies. Here, we propose metasurface-mediated graphene photodetectors with cascaded polarization-sensitive photoresponse under uniform illumination, mimicking an artificial BPVE. With the assistance of non-centrosymmetric metallic nanoantennas, the hot photocarriers in graphene gain a momentum upon their excitation and form a shift current which is nonlocal and directional. Thereafter, we demonstrate zero-bias uncooled mid-infrared photodetectors with three orders higher responsivity than conventional BPVE and a noise equivalent power of 0.12 nW Hz . Besides, we observe a vectorial photoresponse which allows us to detect the polarization angle of incident light with a single device. Our strategy opens up alternative possibilities for scalable, low-cost, multifunctional infrared photodetectors. −1/2
Source Title: NATURE COMMUNICATIONS
URI: https://scholarbank.nus.edu.sg/handle/10635/189584
ISSN: 20411723
DOI: 10.1038/s41467-020-20115-1
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