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High-performance visible/UV CCD focal plane technology for spacebased applicationsWe describe recent technology developments aimed at large CCD imagers for space based applications in the visible and UV. Some of the principal areas of effort include work on reducing device degradation in the natural space-radiation environment, improvements in quantum efficiency in the visible and UV, and larger-device formats. One of the most serious hazards for space based CCD's operating at low signal levels is the displacement damage resulting from bombardment by energetic protons. Such damage degrades charge-transfer efficiency and increases dark current. We have achieved improved hardness to proton-induced displacement damage by selective ion implants into the CCD channel and by reduced temperature of operation. To attain high quantum efficiency across the visible and UV we have developed a technology for back-illuminated CCD's. With suitable antireflection (AR) coatings such devices have quantum efficiencies near 90 percent in the 500-700-nm band. In the UV band from 200 to 400 nm, where it is difficult to find coatings that are sufficiently transparent and can provide good matching to the high refractive index of silicon, we have been able to substantially increase the quantum efficiency using a thin film of HfO2 as an AR coating. These technology efforts were applied to a 420 x 420-pixel frame-transfer imager, and future work will be extended to a 1024 x 1024-pixel device now under development.
Document ID
19930019582
Document Type
Conference Paper
Authors
Burke, B. E. (Massachusetts Inst. of Tech. Lexington, MA, United States)
Mountain, R. W. (Massachusetts Inst. of Tech. Lexington, MA, United States)
Gregory, J. A. (Massachusetts Inst. of Tech. Lexington, MA, United States)
Huang, J. C. M. (Massachusetts Inst. of Tech. Lexington, MA, United States)
Cooper, M. J. (Massachusetts Inst. of Tech. Lexington, MA, United States)
Savoye, E. D. (Massachusetts Inst. of Tech. Lexington, MA, United States)
Kosicki, B. B. (Massachusetts Inst. of Tech. Lexington, MA, United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Lunar and Planetary Inst., Workshop on Advanced Technologies for Planetary Instruments, Part 1
Subject Category
INSTRUMENTATION AND PHOTOGRAPHY
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19930019575Analytic PrimaryWorkshop on Advanced Technologies for Planetary Instruments, part 1