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Title: Ultra-broadband SnSe-based photothermoelectric detector for mid-infrared gas spectroscopy
Authors: Deng, Wenjie
Wang, Chongwu
Dai, Mingjin
Wang, Fakun
Han, Jiayue
Sun, Fangyuan
Wang, Qi Jie
Zhang, Yongzhe
Keywords: Engineering::Materials::Photonics and optoelectronics materials
Issue Date: 2022
Source: Deng, W., Wang, C., Dai, M., Wang, F., Han, J., Sun, F., Wang, Q. J. & Zhang, Y. (2022). Ultra-broadband SnSe-based photothermoelectric detector for mid-infrared gas spectroscopy. Applied Physics Letters, 121(11), 112105-.
Project: NRF-CRP19-2017-01 
Journal: Applied Physics Letters 
Abstract: Seebeck effect is one of the desirable pathways for developing advanced room-temperature (RT) broadband photothermoelectric (PTE) detectors, which are important for infrared spectroscopy applications. However, achieving high performance PTE detectors utilizing materials with high Seebeck coefficient remains a great challenge and further improvements are highly desired. Herein, we introduce a layered material SnSe with high Seebeck coefficient up to 507 ± 20 μV K−1 and further demonstrate an RT ultra-broadband PTE detector ranging from a visible region to a mid-infrared (MIR) region (0.532–13.2 μm). The detector yields a high responsivity of 0.47 V W−1 and a moderate response speed of 107 ms at an excitation wavelength of 8.1 μm at zero bias, which is comparable or higher than those parameters of the commercial products. Moreover, we have retrieved absorption fingerprints of molecular gases during MIR spectroscopy by using this detector owing to its wide response range, which illustrates great potential of this type of broadband high performance PTE detector toward advanced optoelectronics applications.
ISSN: 0003-6951
DOI: 10.1063/5.0109032
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
Organisations: Beijing University of Technology
Research Centres: Centre for OptoElectronics and Biophotonics (OPTIMUS) 
Centre for Disruptive Photonic Technologies
Rights: © 2022 Author(s). All rights reserved. This paper was published by AIP Publishing in Applied Physics Letters and is made available with permission of Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
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