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Study of the effect of temperature on the detectivity and sensitivity of GeSn-based heterojunction phototransistor for mid-wave infrared applications

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Abstract

In an effort to find the optimal mid-wave infrared (MWIR) photodetector, Si-based GeSn heterojunction phototransistors (HPTs) were studied. The figure of merit (FOM) and noise-equivalent-power (NEP) of the proposed device were calculated the first time at different operating temperatures for MWIR applications. In addition, the impact of operating frequency on the detectivity and sensitivity of the device was also studied. A high detectivity of \({>10}^{9}\mathrm{ cm}{\mathrm{Hz}}^{1/2}/\mathrm{W}\), a low NEP of < \({10}^{-12}{\mathrm{WHz}}^{-1/2}\), and a low rise time of \(\sim 7.2 \mathrm{ps}\) were achieved at 300 K. These results indicate that the proposed GeSn HPTs can be used as an optoelectronic converter in a high-speed and low noise photodetection system.

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Acknowledgements

This work has been supported by the DST-Science and Engineering Research Board (DST-SERB), India under Project Early Career Research Award ECR/2017/000794. H. Kumar would like to thank DST-SERB (File No. ECR/2017/000794), Govt. of India, for providing fellowship in the form of Senior Research Fellow (SRF). H. Kumar would also like to thank Dr. Ankit Kumar Pandey (Assistant Professor) at the Department of Electronics and Communication Engineering, Bennett University, Greater Noida, U.P., INDIA, and Prof. Guo-En Chang (Professor) at the Department of Mechanical Engineering and AMI-HI, National Chung Cheng University, Taiwan for meaningful discussions.

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  1. Electronics and Communication Engineering, National Institute of Technology Delhi, New Delhi, 110040, India

    Harshvardhan Kumar & Rikmantra Basu

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  1. Harshvardhan Kumar
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  2. Rikmantra Basu
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Kumar, H., Basu, R. Study of the effect of temperature on the detectivity and sensitivity of GeSn-based heterojunction phototransistor for mid-wave infrared applications. Appl. Phys. B 127, 13 (2021). https://doi.org/10.1007/s00340-020-07569-3

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