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Proceedings Paper

Analysis of effect of HgCdTe passivant on the performance of long-wavelength infrared(LWIR) detectors
Author(s): Peng-xiao Xu; Ke-feng Zhang; Wei Wang; Ni-li Wang; Xiang-yang Li
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Paper Abstract

The performance of HgCdTe infrared photoconductors is strongly dependent on the semiconductor surface conditions. In this paper, the effect of fixed charge density(Qox) due to passivation on the responsivity of HgCdTe photoconductive detectors is analysed both theoretically and experimentally. A profile responsivity model is used here for calculation, which mainly includes the contribution of minority carrier lifetime and the shunt resistance resulting from the accumulation layer at the surface. In this model, the profiles of surface majority carrier concentration and surface mobility are taken into consideration. A gate-controlled photoconductor structure is designed and fabricated to investigate surface effects on HgCdTe infrared photoconductive detectors. And it is used to evaluate and optimize surface passivation layers. Minority carrier lifetime, resistance and responsivity of the device have been measured as a function of the gate potential in this structure. The measured variations have shown a reasonable agreement with our model. It is predicted that the optimization of surface fixed charges at the MCT-passivant interface can bring a great improvement in the responsivity of photoconductive detectors.

Paper Details

Date Published: 8 December 2011
PDF: 8 pages
Proc. SPIE 8002, MIPPR 2011: Multispectral Image Acquisition, Processing, and Analysis, 800204 (8 December 2011); doi: 10.1117/12.901977
Show Author Affiliations
Peng-xiao Xu, Shanghai Institute of Technical Physics (China)
Graduate Univ. of CAS (China)
Ke-feng Zhang, Shanghai Institute of Technical Physics (China)
Wei Wang, Shanghai Institute of Technical Physics (China)
Graduate Univ. of CAS (China)
Ni-li Wang, Shanghai Institute of Technical Physics (China)
Xiang-yang Li, Shanghai Institute of Technical Physics (China)


Published in SPIE Proceedings Vol. 8002:
MIPPR 2011: Multispectral Image Acquisition, Processing, and Analysis
Faxiong Zhang; Faxiong Zhang, Editor(s)

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