Reduction in dark current using resonant tunneling barriers in quantum dots-in-a-well long wavelength infrared photodetector

We report the use of resonant tunneling (RT) assisted barriers to reduce the dark current in quantum dots-in-a-well (DWELL) infrared photodetectors. Designed RT barriers allow energy-selective extraction of photoexcited carriers while blocking a continuum of energies. Over two orders of magnitude re...

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Veröffentlicht in:Applied physics letters 2008-09, Vol.93 (13), p.131115-131115-3
Hauptverfasser: Barve, A. V., Shah, S. Y., Shao, J., Vandervelde, T. E., Shenoi, R. V., Jang, W.-Y., Krishna, S.
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Sprache:eng
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Zusammenfassung:We report the use of resonant tunneling (RT) assisted barriers to reduce the dark current in quantum dots-in-a-well (DWELL) infrared photodetectors. Designed RT barriers allow energy-selective extraction of photoexcited carriers while blocking a continuum of energies. Over two orders of magnitude reduction in the dark current in the RT-DWELL device over a control sample without RT-DWELL at 77 K has been demonstrated. Specific detectivity ( D * ) of 3.6 × 10 9 cm Hz 1 ∕ 2 W − 1 at 77 K at λ peak = 11 μ m with a conversion efficiency of 5.3% was obtained in the RT-DWELL device. D * for the RT-DWELL device is five times higher than that of the control sample.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2996410