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Resonant Tunneling Barriers in Quantum Dots-in-a-Well Infrared Photodetectors

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8 Author(s)
Barve, Ajit ; Dept. of Electr. & Comput. Eng., Univ. of New Mexico, Albuquerque, NM, USA ; Shao, Jiayi ; Sharma, Y.D. ; Vandervelde, T.E.
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The use of resonant tunneling (RT) barriers in the design of quantum dots-in-a-well (DWELL) infrared photodetectors is reported. The design of RT barriers for a variety of goals has been discussed. For simple DWELL designs, we demonstrate 2-3 orders-of-magnitude reduction in the dark current, with significant increase in the specific detectivity (D *) of the device. Two RT barriers are designed to selectively extract midwave and longwave components of the spectral response. We also report the use of RT barriers on strain-optimized quantum dots-in-a-double-well (DDWELL) structures to achieve very low dark current levels with peak D * of 2.9 ×1010 cm· Hz1/2 /W for a longwave infrared detection. Ability to select a particular wavelength in the spectral response is demonstrated with DDWELL architectures as well.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:46 ,  Issue: 7 )

Date of Publication:

July 2010

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