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22 July 1998 Two-stack indirect-barrier/triple-coupled quantum well infrared photodetector for mid-wavelength and long-wavelength infrared detection
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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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jiangchi Chiang, Sheng S. Li, and Anjali Singh "Two-stack indirect-barrier/triple-coupled quantum well infrared photodetector for mid-wavelength and long-wavelength infrared detection", Proc. SPIE 3379, Infrared Detectors and Focal Plane Arrays V, (22 July 1998); https://doi.org/10.1117/12.317594
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