Computer Science – Performance
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3379..274c&link_type=abstract
Proc. SPIE Vol. 3379, p. 274-285, Infrared Detectors and Focal Plane Arrays V, Eustace L. Dereniak; Robert E. Sampson; Eds.
Computer Science
Performance
Scientific paper
We report a two-stack indirect-barrier (IB-) GaAs/Al(subscript 0.55)Ga(subscript 0.45)As quantum well infrared photodetector (QWIP) for mid-wavelength infrared (MWIR) and a voltage-tunable In(subscript 0.05)Ga(subscript 0.95)As/GaAs/Al(subscript 0.19)Ga(subscript 0.81)As triple-coupled (TC-) QWIP for long-wavelength infrared (LWIR) detection. We also investigate the performance dependence of this stacked QWIP with different quantum well periods (20-period and 40- period). The peak responsivity of the 20-period stacked-QWIP at zero bias (PV mode) was found to be 30 mA/W at (lambda) (subscript p) equals 4.3 micrometer and T equals 40 K. The maximum peak responsivity (PC mode) was found to be 0.25 A/W at (lambda) (subscript p) equals 4.3 micrometer, V(subscript b) equals -4 V, and T equals 40 K for the 20-period MWIR IB-QWIP. For the LWIR TC- QWIP, the peak wavelength due to (E(subscript 1) yields E(subscript 3)) transition shifts from 10 micrometer to 9.4 micrometer as bias voltage changes from 5 to 7 V and from 9 to 14 V for 20-period and 40 period devices, respectively. A peak responsivity of 0.16 A/W was obtained at (lambda) (subscript p) equals 9.4 micrometer, V(subscript b) equals 7 V, and T equals 40 K for the 20-period TC- QWIP. The results show that simultaneous detection of IR radiation at both the MWIR and LWIR bands can be achieved at V(subscript b) greater than or equal to 7 V or V(subscript b) less than or equal to -5 V for the 20-period stacked QWIP. It is shown that this two-stack QQWIP can be used as a wavelength-tunable IR detector for the MWIR and LWIR bands.
Chiang Jiangchi
Li Sheng S.
Singh Anjali
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