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Proceedings Paper

Large-format MWIR focal plane arrays
Author(s): Tim Ashley; Ronald A. Ballingall; John E. Beale; Ian D. Blenkinsop; Theresa M. Burke; Jim H. Firkins; David J. Hall; Leslie G. Hipwood; Colin Hollier; Peter Knowles; David J. Lees; J. Chris Little; Chris Shaw
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Paper Abstract

Medium wavelength IR arrays have been develoepd which have 1024×768 pixels on a 26 micron pitch. The arrays are made from epitaxially grown indium antimonide, the use of which confers two advantages over conventional InSb owing to the ability to exercise atomic level control of dopants and material thicknesses. Firstly, the photodiodes can be grown on degenerately doped InSb substrates which have a high degree of transparency, so the requirement for the substrate to be thinned is much reduce dleading to simplified manufacture. Secondly, it offers the potential for an increase in operating temperature of many tens of degrees, through elimination of contact leakage currents, though we focus on 80K performance here for comparison with conventional structures. We present initail results form arrays which indicate high operability, despite the need to stitch reticles in the fabrication of the silicon read-out circuit, and temperature sensitivity close to the theoretical limit. Imaging from the arrays compares very favorably with that taken using generation II cameras and gives confidence that this technology offers a cost effective route to large format MWIR systems.

Paper Details

Date Published: 23 January 2003
PDF: 6 pages
Proc. SPIE 4820, Infrared Technology and Applications XXVIII, (23 January 2003); doi: 10.1117/12.451971
Show Author Affiliations
Tim Ashley, QinetiQ (United Kingdom)
Ronald A. Ballingall, Defence Science and Technology Lab. (United Kingdom)
John E. Beale, QinetiQ (United Kingdom)
Ian D. Blenkinsop, QinetiQ (United Kingdom)
Theresa M. Burke, QinetiQ (United Kingdom)
Jim H. Firkins, QinetiQ (United Kingdom)
David J. Hall, QinetiQ (United Kingdom)
Leslie G. Hipwood, BAE SYSTEMS (United Kingdom)
Colin Hollier, QinetiQ (United Kingdom)
Peter Knowles, BAE SYSTEMS (United Kingdom)
David J. Lees, QinetiQ (United Kingdom)
J. Chris Little, QinetiQ (United Kingdom)
Chris Shaw, BAE SYSTEMS (United Kingdom)

Published in SPIE Proceedings Vol. 4820:
Infrared Technology and Applications XXVIII
Bjorn F. Andresen; Gabor F. Fulop; Marija Strojnik, Editor(s)

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