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8 September 1995 Long-wavelength infrared photoconductor technology based on epitaxially grown Hg1-xCdxTe
John F. Siliquini, Kevin A. Fynn, Charles A. Musca, Brett D. Nener, John M. Dell, Lorenzo Faraone
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Proceedings Volume 2552, Infrared Technology XXI; (1995) https://doi.org/10.1117/12.218206
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States
Abstract
The performance of Hg1-xCdxTe long wavelength infrared (LWIR) photoconductors is strongly dependent on the semiconductor surface conditions and contact characteristics. In this paper we review these effects in relation to obtaining an optimum device technology suitable for use in two-dimensional infrared focal plane arrays (IRFPAs) based on the fabrication of high performance LWIR photoconductors on epitaxially grown Hg1-xCdxTe. Although the proposed design can be applied to a variety of epitaxially grown Hg1-xCdxTe material, for optimum performance the starting Hg1-xCdxTe semiconductor consists of epitaxially grown heterostructure layers in which a two-dimensional mosaic of lateral design photoconductors are fabricated. The heterostructure layer provides high performance devices at greatly reduced power dissipation levels, while the unique design allows for the high density integration of photoconductors in a two-dimensional array geometry with high fill factor. The proposed photoconductor array with n+ blocking contacts has been experimentally verified in a 3 X 3 array format with all elements in the array exhibiting background limited infrared photodetector (BLIP) performance at 80 K. Performance issues such as response uniformity, pixel yield, fill factor, crosstalk, power dissipation, detector impedance, array architecture, and maximum array size are discussed in relation to the suitability of the proposed photoconductor structure for use in IRFPA modules. It is found that in many cases the proposed photoconductor technology has the potential to deliver significant advantages, such as higher yield, higher fill factor, better uniformity, less crosstalk, and larger potential array size, in comparison to an IRFPA design based on photovoltaic technology.
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John F. Siliquini, Kevin A. Fynn, Charles A. Musca, Brett D. Nener, John M. Dell, and Lorenzo Faraone "Long-wavelength infrared photoconductor technology based on epitaxially grown Hg1-xCdxTe", Proc. SPIE 2552, Infrared Technology XXI, (8 September 1995); https://doi.org/10.1117/12.218206
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KEYWORDS
Tellurium
Sensors
Photoresistors
Long wavelength infrared
Photovoltaics
Heterojunctions
Semiconductors
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