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

Barve, A. V.; Shah, S. Y.; Shao, J.; Vandervelde, T. E.; Shenoi, R. V.; Jang, W.-Y.; Krishna, S.
September 2008
Applied Physics Letters;9/29/2008, Vol. 93 Issue 13, p131115
Academic Journal
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 3.6×109 cm Hz1/2 W-1 at 77 K at λpeak=11 μm 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.


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