Dual-band response in Type-II superlattice infrared photodetectors with a modified pBp design

R. Suzuki; K. Ozaki; Y. Matsumiya; Y. Yamazaki; K. Tsunoda; H. Nishino

doi:10.1117/12.2586042

12 April 2021 Dual-band response in Type-II superlattice infrared photodetectors with a modified pBp design

R. Suzuki, K. Ozaki, Y. Matsumiya, Y. Yamazaki, K. Tsunoda, H. Nishino

Proceedings Volume 11741, Infrared Technology and Applications XLVII; 117410P (2021) https://doi.org/10.1117/12.2586042
Event: SPIE Defense + Commercial Sensing, 2021, Online Only

Abstract

Dual-band infrared photodetectors with a modified pBp design have been demonstrated. The modified pBp structure consisted of a p-type InAs/GaSb superlattice for long-wavelength (LW) detection and a p-type InAs/GaSb/AlSb based superlattice for mid-wavelength (MW) detection, which were separated by a hole barrier consisting of an InAs/AlSb superlattice. Our pBp device showed that dual-band detection was possible by changing the bias polarity of the applied voltage. By using an InAs/GaSb/AlSb based superlattice as an MW absorber for a pBp photodetector, a 100 % cutoff wavelength was blue-shifted from 8 μm to 7 μm compared with a conventional InAs/GaSb superlattice, while maintaining the same 50 % cutoff wavelength of around 6.4 μm. Quantum efficiency per period of the modified MW absorber was comparable with that of a conventional MW absorber. These results indicate that our modified pBp structure is expected to be a promising candidate for dual-band infrared photodetectors.

Citation Download Citation

R. Suzuki, K. Ozaki, Y. Matsumiya, Y. Yamazaki, K. Tsunoda, and H. Nishino "Dual-band response in Type-II superlattice infrared photodetectors with a modified pBp design", Proc. SPIE 11741, Infrared Technology and Applications XLVII, 117410P (12 April 2021); https://doi.org/10.1117/12.2586042

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