Sb<sub>2</sub>Te<sub>3</sub>–Bi<sub>2</sub>Te<sub>3</sub> Direct Photo–Thermoelectric Mid‐Infrared Detection
Abstract A compact and responsive thermoelectric photodetector is introduced for the mid‐infrared. By resonantly coupling mid‐infrared light to a Sb 2 Te 3 ‐Bi 2 Te 3 thermoelectric junction, a thermocouple is formed that is directly heated by narrow‐band mid‐infrared radiation. Near‐perfect absorption is achieved at this hot junction through the resonantly enhanced coupling of light to free‐electrons in the Bi 2 Te 3 and Sb 2 Te 3 materials. The fabricated devices operate at 3.6 µm and demonstrate a responsivity of 10.2 V W −1 , a specific detectivity of 4.6 × 10 6 cm Hz 1/2 W −1 , and a bandwidth in the order of 1 kHz. The optimal detection wavelength can be spectrally tuned by changing the resonant cavity dimensions. This work shows a path toward miniaturized mid‐infrared detectors and spectrometers with high sensitivity, responsivity, and bandwidth. Importantly, the device presented here is ideal for industrial production, which it is hoped will provide wider access to mid‐infrared technologies for chemical sensing, medicine, and security.
Authors
- Joel K. W. Yang (ORCID: https://orcid.org/0000-0003-3301-1040)
- Mingjin Dai (ORCID: https://orcid.org/0000-0001-6009-1715)
- Robert E. Simpson (ORCID: https://orcid.org/0000-0002-3499-4950)
- Kenta Hamada (ORCID: https://orcid.org/0000-0003-0768-3783)
- M. A. Rahman (ORCID: https://orcid.org/0000-0003-3199-9251)
- Golnoush Zamiri (ORCID: https://orcid.org/0000-0003-4223-5062)
- Wakana Kubo (ORCID: https://orcid.org/0000-0002-5842-5445)
- Zhaogang Dong (ORCID: https://orcid.org/0000-0002-0929-7723)
- Simon Wredh (ORCID: https://orcid.org/0000-0003-2779-0164)
- Wenhao Zhai (ORCID: https://orcid.org/0000-0001-6865-6370)
- Nur Qalishah Adanan (ORCID: https://orcid.org/0000-0003-1320-8962)
- Qing Yang Steve Wu (ORCID: https://orcid.org/0000-0003-2525-8334)
- Nancy Wong Lai Mun
- Qi Jie Wang
Institutions
- Agency for Science, Technology and Research (SG)
- Singapore University of Technology and Design (SG)
- Nanyang Technological University (SG)
- Institute of Materials Research and Engineering (SG)
- University of Birmingham (GB)
- Tokyo University of Agriculture and Technology (JP)
Publication Details
- Journal
- Advanced Optical Materials
- Published
- 2024-09-10
- DOI
- https://doi.org/10.1002/adom.202401450
- Citations
- 13
- Primary Topic
- Advanced Thermoelectric Materials and Devices
- Type
- article
- Field-Weighted Citation Impact
- 1.52
Funders
- National Research Foundation
- Agency for Science, Technology and Research
- National Research Foundation Singapore
- Ministry of Education, India