Long-wavelength interband cascade infrared photodetectors operating above room temperature

Hossein Lotfi; Lin Lei; Lu Li; Rui Q. Yang; Joel C. Keay; Matthew B. Johnson; Yueming Qiu; Dmitri Lubyshev; Joel M. Fastenau; Amy W. K. Liu

doi:10.1117/12.2077844

8 February 2015 Long-wavelength interband cascade infrared photodetectors operating above room temperature

Hossein Lotfi, Lin Lei, Lu Li, Rui Q. Yang, Joel C. Keay, Matthew B. Johnson, Yueming Qiu, Dmitri Lubyshev, Joel M. Fastenau, Amy W. K. Liu

Author Affiliations +

Proceedings Volume 9370, Quantum Sensing and Nanophotonic Devices XII; 937032 (2015) https://doi.org/10.1117/12.2077844
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

We present recent studies on a set of three different long wave IR interband cascade infrared photodetectors with Type-II InAs/GaSb absorbers. Two of these detectors were two- and three-stage structures with regular-illumination configuration and the other was a two-stage structure with reverse-illumination configuration. The 100% cutoff wavelength for these detectors was 6.2 μm at 78 K and extended to 8 μm at 300 K. At T=125 K and higher temperatures we were able to observe the benefits of the three-stage detector over the two-stage device in terms of lower dark current and higher detectivity. We conjecture that the imperfections from the device growth and fabrication had a substantial effect on the low-temperature device performance and were responsible for unexpected behavior at these temperatures. We also found that the zero-bias photo-response increased for temperatures up to 200 K, which was indicative of efficient collection of photo-generated carriers at relatively high temperatures. Electroluminescence and X-ray diffraction measurements suggest that all three grown structures had comparable material qualities. However, the twostage detectors with the reverse-illumination had significantly lower performance than the other two detectors. The activation energy for the two-stage detectors with the reverse-illumination was 37 meV for T=78-100 K, which was much lower than the activation energies of the other two detectors (~140 meV). This low activation energy was attributed to shunt leakage observed in detectors with the reverse-illumination configuration.

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Hossein Lotfi, Lin Lei, Lu Li, Rui Q. Yang, Joel C. Keay, Matthew B. Johnson, Yueming Qiu, Dmitri Lubyshev, Joel M. Fastenau, and Amy W. K. Liu "Long-wavelength interband cascade infrared photodetectors operating above room temperature", Proc. SPIE 9370, Quantum Sensing and Nanophotonic Devices XII, 937032 (8 February 2015); https://doi.org/10.1117/12.2077844

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