SSb2Te3–Bi2Te3 Direct Photo–Thermoelectric Mid-Infrared Detection

SSb2Te3–Bi2Te3 Direct Photo–Thermoelectric Mid-Infrared Detection

Advanced Optical Materials

10.1002/adom.202401450

https://doi.org/10.1002/adom.202401450

Simon Wredh, Mingjin Dai, Kenta Hamada, Md Abdur Rahman, Nur Qalishah Adanan, Golnoush Zamiri, Qing Yang Steve Wu, Wenhao Zhai, Nancy Wong Lai Mun, Zhaogang Dong, Wakana Kubo, Qi Jie Wang, Joel K.W. Yang, Robert E. Simpson

thermoelectric, photodetector, resonant absorption, mid-infrared, tellurium compounds

09 September 2024

Wredh, S., Dai, M., Hamada, K., Rahman, M. A., Adanan, N. Q., Zamiri, G., Wu, Q. Y. S., Zhai, W., Mun, N. W. L., Dong, Z., Kubo, W., Wang, Q. J., Yang, J. K. W., & Simpson, R. E. (2024). Sb2Te3–Bi2Te3 Direct Photo–Thermoelectric Mid‐Infrared Detection. Advanced Optical Materials, 12(31). Portico. https://doi.org/10.1002/adom.202401450

A compact and responsive thermoelectric photodetector is introduced for the mid‐infrared. By resonantly coupling mid‐infrared light to a Sb2Te3‐Bi2Te3 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 Bi2Te3 and Sb2Te3 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  × 106 cm Hz1/2 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.

Attribution 4.0 International (CC BY 4.0)

This research / project is supported by the Agency for Science, Technology and Research - Career Development Award
Grant Reference no. : C210112019

This research / project is supported by the Agency for Science, Technology and Research - Manufacturing, Trade, and Connectivity (MTC) Individual Research Grants
Grant Reference no. : M21K2c0116

This research / project is supported by the Agency for Science, Technology and Research - Manufacturing, Trade, and Connectivity (MTC) Individual Research Grant
Grant Reference no. : M22K2c0088

This research / project is supported by the National Research Foundation, Singapore - Quantum Engineering Programme 2.0
Grant Reference no. : NRF2021-QEP2-03-P09

This research is supported by core funding from: DELTA-Q 2.0
Grant Reference no. : C230917005

This research / project is supported by the National Research Foundation, Singapore - Competitive Research Programme
Grant Reference no. : NRF-CRP30-2023-0003, NRF-CRP26-2021-0004

https://oar.a-star.edu.sg/communities-collections/articles/21755

2195-1071
2195-1071

Institute of Materials Research and Engineering

https://advanced.onlinelibrary.wiley.com/doi/10.1002/adom.202401450