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Resonant Tunneling Barriers in Quantum Dots-in-a-Well Infrared Photodetectors
Barve, A.,Jiayi Shao,Sharma, Y.D.,Vandervelde, T.E.,Sankalp, K.,Sang Jun Lee,Sam Kyu Noh,Krishna, S. IEEE 2010 IEEE journal of quantum electronics Vol.46 No.7
<P>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 (<I>D</I> <SUP>*</SUP>) 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 <I>D</I> <SUP>*</SUP> of 2.9 ×10<SUP>10</SUP> cm· Hz<SUP>1/2</SUP> /W for a longwave infrared detection. Ability to select a particular wavelength in the spectral response is demonstrated with DDWELL architectures as well.</P>
FLOWERING LOCUS T duplication coordinates reproductive and vegetative growth in perennial poplar
Hsu, C.-Y.,Adams, J.P.,Kim, H.,No, K.,Ma, C.,Strauss, S.H.,Drnevich, J.,Vandervelde, L.,Ellis, J.D.,Rice, B.M. National Academy of Sciences 2011 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.108 No.26