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Proceedings Paper

Two-stack indirect-barrier/triple-coupled quantum well infrared photodetector for mid-wavelength and long-wavelength infrared detection
Author(s): Jiangchi Chiang; Sheng S. Li; Anjali Singh
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Paper Abstract

We report a two-stack indirect-barrier (IB-) GaAs/Al0.55Ga0.45As quantum well infrared photodetector (QWIP) for mid-wavelength infrared (MWIR) and a voltage-tunable In0.05Ga0.95As/GaAs/Al0.19Ga0.81As 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) 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) p equals 4.3 micrometer, Vb 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 (E1 yields E3) 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) p equals 9.4 micrometer, Vb 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 Vb greater than or equal to 7 V or Vb 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.

Paper Details

Date Published: 22 July 1998
PDF: 12 pages
Proc. SPIE 3379, Infrared Detectors and Focal Plane Arrays V, (22 July 1998); doi: 10.1117/12.317594
Show Author Affiliations
Jiangchi Chiang, Univ. of Florida (United States)
Sheng S. Li, Univ. of Florida (United States)
Anjali Singh, Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 3379:
Infrared Detectors and Focal Plane Arrays V
Eustace L. Dereniak; Robert E. Sampson, Editor(s)

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