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Titolo:
Space charge solution of Rittner photoconductor equation for a HgCdTe detector
Autore:
Bicknell, WE;
Indirizzi:
MIT, Lincoln Lab, Lexington, MA 02420 USA MIT Lexington MA USA 02420MIT, Lincoln Lab, Lexington, MA 02420 USA
Titolo Testata:
INFRARED PHYSICS & TECHNOLOGY
fascicolo: 1, volume: 43, anno: 2002,
pagine: 39 - 50
SICI:
1350-4495(200202)43:1<39:SCSORP>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
GENERATION-RECOMBINATION NOISE; INTRINSIC PHOTOCONDUCTORS; RESPONSIVITY; PERFORMANCE; CONTACTS;
Keywords:
HgCdTe photoconductor; Rittner photoconductor equation; space charge effect; non-linear responsivity; GOES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
--discip_EC--
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Bicknell, WE MIT, Lincoln Lab, 244 Wood St, Lexington, MA 02420 USA MIT 244 Wood St Lexington MA USA 02420 exington, MA 02420 USA
Citazione:
W.E. Bicknell, "Space charge solution of Rittner photoconductor equation for a HgCdTe detector", INFR PHYS T, 43(1), 2002, pp. 39-50

Abstract

The steady-state charge continuity equations are linearized to derive a space charge field that accompanies the ambipolar diffusion and drift described by the Rittner equation. The space charge field is evaluated for a typical 14.2 mum cutoff wavelength HgCdTe detector operating at 85 K. It is found that the space charge density is similar to 10(-5) times the hole and electron population density generated by photon flux. This corroborates that Rittner's equation gives an accurate solution for the hole and electron densities. But, at relatively high photon flux levels that are found in some Geostationary Operational Environment Satellite instrument channels, the small average space charge field can have a noticable effect on the linearity of detector response. Divergence of electric field terms in the continuity equations, which are absent from the Rittner equation, can also contribute anon-linearity to detector response. (C) 2002 Elsevier Science B.V. All rights reserved.

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Documento generato il 10/07/20 alle ore 08:03:26