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Novel Metal-Semiconductor-Metal Photodetectors on Semi-Insulating Indium Phosphide

Published online by Cambridge University Press:  03 September 2012

J.W. Palmer  and
W.A. Anderson
J.W. Palmer
Affiliation:
Semiconductor Test Products, Keithley Instruments, Inc., 28775 Aurora Road, Cleveland, Ohio, 44139-1891.
W.A. Anderson
Affiliation:
Department of Electrical, Computer Engineering, State University of New York at Buffalo, 217C Bonner Hall, Amherst, NY 14260.
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Abstract

Depositing Pd or Au on InP at substrate temperatures near 77K has previously been found to significantly reduce the interaction between the metal and semiconductor upon formation of the interface. In this work, this technique was used to fabricate metal-semiconductor-metal photodetectors (MSMPD’s) on semi-insulating (SI) InP substrates with superior characteristics compared to detectors formed using standard room temperature (RT) metal deposition. The low-temperature (LT) metallizations were patterned using a polyimide/SiO2 lift-off mask, and a SiO antireflection coating was used to attain near-zero reflection at λ=840nm. The detectors had an active area of 200μm × 200μm, and line widths and line spacings of 3μm. Detectors having a LT-Pd/SI-InP structure had a dark current of 80nA at 5V, which was a factor of 4 lower than the dark current of conventional MSMPD’s. Additionally, LT-Pd/SI-InP MSMPD’s exhibited excellent saturation characteristics and a responsivity of 0.75 A/W. Detectors with an indium-tin-oxide (ITO)/LT-Au(200Å)/SI-InP structure had a higher responsivity of 1.0 A/W, due to the relative transparency of this metallization. In contrast, MSMPD’s with RT metallizations had poor saturation characteristics, consistent with the results of others. The difference in the illuminated characteristics of MSMPD’s with RT and LT metallizations was due to a change in the internal photoconductive gain mechanism. In RT detectors, hole trapping at interface states near the cathode dominated the gain mechanism. In LT detectors, the difference in carrier transit-times dominated.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 448: Symposium M – Control of Semiconductor Surfaces and Interfaces , 1996 , 407
Copyright
Copyright © Materials Research Society 1997

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