Two-color infrared photodetector using GaAs/AlGaAs and strained InGaAs/AlGaAs multiquantum wells

Tsai, K. L. ; Chang, K. H. ; Lee, C. P. ; Huang, K. F. ; Tsang, J. S. ; Chen, H. R.

Woodbury, NY : American Institute of Physics (AIP)
Published 1993
ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
A two-color infrared detector using GaAs/AlGaAs and strained InGaAs/AlGaAs multiquantum wells is demonstrated. The response peak of the GaAs/AlGaAs quantum well is at 8 μm, and that of the InGaAs/AlGaAs quantum well is at 5.3 μm. The responsivity of the detector is 1 A/W at 8 μm and 0.27 A/W at 5.3 μm; these are the best values reported for a two-color quantum well infrared detectors (QWIPs) with peak sensitivities in the spectral regions of 3–5.3 μm and 7.5–14 μm. Single-colored 5.3 and 8 μm QWIPs were also fabricated to study the bias dependent behavior. This behavior can be explained using the concept of current continuity. Because of a higher electrical resistance, a high electric field domain is always formed first in the shorter wavelength quantum well stack.
Type of Medium:
Electronic Resource
URL: