Physics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1685..241y&link_type=abstract
Proc. SPIE Vol. 1685, p. 241-249, Infrared Detectors and Focal Plane Arrays II, Eustace L. Dereniak; Robert E. Sampson; Eds.
Physics
Scientific paper
A metal grating coupled step-bound-to-miniband (SBTM) transition multiquantum well long wavelength infrared photodetector (LWIP) using a lightly strained In(subscript 0.07)Ga(subscript 0.93)As quantum well with a short-period Al(subscript 0.4)Ga(subscript 0.6)As -GaAs superlattice barrier structure has been developed. The new structure created a potential `step' in the superlattice barrier to block the undesirable electron tunneling current from the heavily doped ground state in the quantum well, which results in a significant reduction in the device dark current. The measured absorbance spectra and photocurrent are in good agreement with our theoretical predictions. The responsivity R(subscript (lambda) ) at V(subscript b) equals 6 V and T equals 77 K was found equal to 0.2, 0.15 A/W for the backside, and front normal incident illumination, respectively.
Ho Pin
Li Sheng S.
Wang Yanhua H.
Yu Larry S.
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