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Proceedings Paper

Electromagnetically carrier depleted IR photodetector
Author(s): Zoran G. Djuric; Jozef Piotrowski
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Paper Abstract

A method is presented for the thermal noise reduction in a near room-temperature intrinsic IR photodetector. The method is based on suppression of the Auger generation-recombination processes using the Electro-Magnetic Carrier Depletion (EMCD) of a narrow gap semiconductor. The device is a lightly doped narrow gap semiconductor flake with a high backside surface recombination velocity, supplied with electrical contact and placed in a magnetic field. Due to action of the Lorentz force, most of the device depletes in charge carriers, resulting in suppression of the Auger generation and recombination processes. As a result, the I-V characteristic becomes nonlinear, exhibiting regions of high positive and negative resistance. The thermal noise can be dramatically reduced, leading to a substantial improvement of performance. The ultimate detectivity may be determined either by the background radiation or by the Shockley-Read generation, in dependence on the ratio of the background photon flux to the recombination center concentration. The near-BLIP performance is predicted for 10.6 micrometers (Hg,Cd)Te devices, prepared from high quality materials and operated at 225 - 250 K.

Paper Details

Date Published: 1 December 1991
PDF: 11 pages
Proc. SPIE 1540, Infrared Technology XVII, (1 December 1991); doi: 10.1117/12.48766
Show Author Affiliations
Zoran G. Djuric, Univ. of Belgrade (Serbia)
Jozef Piotrowski, Vigo Ltd. (Poland)

Published in SPIE Proceedings Vol. 1540:
Infrared Technology XVII
Bjorn F. Andresen; Marija Scholl; Irving J. Spiro, Editor(s)

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