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Proceedings Paper

Quantum well infrared photodetectors for low-background applications
Author(s): Sumith V. Bandara; Sarath D. Gunapala; S. B. Rafol; David Z.-Y. Ting; John K. Liu; Jason M. Mumolo; Thang Trinh
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Paper Abstract

Quantum Well Infrared Photodetectors (QWIPs) afford greater flexibility than the usual extrinsically doped semiconductor IR detectors. The wavelength of the peak response and cutoff can be continuously tailored over any wavelength range between 6-20micrometers . The spectral band width of these detectors can be tuned from narrow ((Delta) (lambda) /(lambda) ~10%) to wide ((Delta) (lambda) /(lambda) ~40%) allowing various applications. Also, QWIP device parameters can be optimized to achieve extremely high performances at high background at lower operating temperatures (~30 K). However, for low- background irradiance levels at low operating temperatures, high resistivity of the active region could lead to non- linear responsivity behavior. A new structure with a photosensitive superlattice and a thick blocking barrier has been tested, and is expected to avoid anomalous behavior under low backgrounds at low temperatures.

Paper Details

Date Published: 5 August 2002
PDF: 6 pages
Proc. SPIE 4721, Infrared Detectors and Focal Plane Arrays VII, (5 August 2002); doi: 10.1117/12.478842
Show Author Affiliations
Sumith V. Bandara, Jet Propulsion Lab. (United States)
Sarath D. Gunapala, Jet Propulsion Lab. (United States)
S. B. Rafol, Jet Propulsion Lab. (United States)
David Z.-Y. Ting, Jet Propulsion Lab. (United States)
John K. Liu, Jet Propulsion Lab. (United States)
Jason M. Mumolo, Jet Propulsion Lab. (United States)
Thang Trinh, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 4721:
Infrared Detectors and Focal Plane Arrays VII
Eustace L. Dereniak; Robert E. Sampson, Editor(s)

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