Ultra-broadband SnSe-based photothermoelectric detector for mid-infrared gas spectroscopy

Author:

Deng Wenjie12ORCID,Wang Chongwu2,Dai Mingjin2,Wang Fakun2,Han Jiayue2,Sun Fangyuan2,Wang Qi Jie23ORCID,Zhang Yongzhe1ORCID

Affiliation:

1. Key Laboratory of Optoelectronics Technology, Ministry of Education, Faculty of Information Technology, Beijing University of Technology, Beijing 100124, China

2. Centre for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore

3. Centre for Disruptive Photonic Technologies, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore

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.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Beijing Municipality

National Research Foundation Singapore

Agency for Science, Technology and Research

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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