NDLI: Effects of passivation and extraction surface trap density on the 1/f noise of HgCdTe photoconductive detector

Content Provider	IEEE Xplore Digital Library
Author	Lin, C.T. Su, Y.K. Chang, S.J. Huang, H.T. Chang, S.M. Sun, T.P.
Copyright Year	1989
Abstract	Experimental results are presented for noise voltage, responsivity, and specific detectivity (D) for the long wavelength infrared (IR) HgCdTe photoconductive detectors. Hg/sub 0.8/Cd/sub 0.2/Te photoconductive detectors passivated with ZnS/photo-enhanced native oxide have an improved noise spectral density and D than the detectors passivated with only ZnS. The low frequency 1/f noise charges were measured for a Hg/sub 0.8/Cd/sub 0.2/Te photo detector, as a function of bias at 77 K, and the effective surface trap density determined from the 1/f noise charges measured at 1 Hz. It was found that the surface effective trap densities of stacked passivated sample and the sample passivated only with ZnS are close to 4/spl times/10/sup 17/ and 9/spl times/10/sup 17/ cm/sup -2/ eV/sup -1/ under 0.4 V bias and 1 /spl mu/s integration time, respectively. We found that the numerical values of noise are strongly dependent upon surface passivation properties. It can be seen clearly that an HgCdTe photo detector with a stacked ZnS/photo-enhanced native oxide passivation is better than the HgCdTe photo detector passivated with a single ZnS layer.
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	232
Ending Page	234
Page Count	3
File Size	85188
File Format	PDF
ISSN	10411135
Volume Number	9
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Passivation Photoconductivity Zinc compounds Infrared detectors Low-frequency noise Mercury (metals) Tellurium Density measurement Current measurement Frequency measurement
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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