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5 August 2002 Quantum well infrared photodetectors for low-background applications
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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.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sumith V. Bandara, Sarath D. Gunapala, S. B. Rafol, David Z.-Y. Ting, John K. Liu, Jason M. Mumolo, and Thang Trinh "Quantum well infrared photodetectors for low-background applications", Proc. SPIE 4721, Infrared Detectors and Focal Plane Arrays VII, (5 August 2002);

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