Computer Science
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1107..152w&link_type=abstract
IN: Infrared detectors, focal plane arrays, and imaging sensors; Proceedings of the Meeting, Orlando, FL, Mar. 30, 31, 1989 (A90
Computer Science
Infrared Detectors, Photoconductors, Beryllium, Dielectrics, Doped Crystals, Gallium Arsenides, Space Charge
Scientific paper
The Periodic Extrinsic IR (PEIR) photoconductor, for operation in the 7-100 micron range, is composed of heavility doped layers separated by lightly doped ones; radiation excites the carriers from the impurity band to the conduction or valence band. The PEIR photoconductor resembles blocked impurity band (BIB) detectors, but differs in that the Poole-Frenkel effect, as well as tunneling out of the impurity band, both of which limit the operation of a BIB detector, pose a much less serious problem in the case of the PEIR device. PEIR photoconductors are projected to have higher absorption rates and the ability to detect longer wavelengths with increasing quantum efficiencies, by comparison with BIB devices.
Schwartz R. J.
Welsh P. E.
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