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Proceedings Paper

Improving quantum efficiency and spectral resolution of a CCD through direct manipulation of the depletion region
Author(s): Craig Brown; Richard M. Ambrosi; Tony Abbey; Olivier Godet; R. O'Brien; M. J. L. Turner; Andrew Holland; Peter J. Pool; David Burt; David Vernon
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Paper Abstract

Future generations of X-ray astronomy instruments will require position sensitive detectors in the form of charge-coupled devices (CCDs) for X-ray spectroscopy and imaging with the ability to probe the X-ray universe with greater efficiency. This will require the development of CCDs with structures that will improve their quantum efficiency over the current state of the art. The quantum efficiency improvements would have to span a broad energy range (0.2 keV to >15 keV). These devices will also have to be designed to withstand the harsh radiation environments associated with orbits that extend beyond the Earth's magnetosphere. This study outlines the most recent work carried out at the University of Leicester focused on improving the quantum efficiency of an X-ray sensitive CCD through direct manipulation of the device depletion region. It is also shown that increased spectral resolution is achieved using this method due to a decrease in the number of multi-pixel events. A Monte Carlo and analytical models of the CCD have been developed and used to determine the depletion depths achieved through variation of the device substrate voltage, Vss. The models are also used to investigate multi-pixel event distributions and quantum efficiency as a function of depletion depth.

Paper Details

Date Published: 15 July 2008
PDF: 7 pages
Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 70113Z (15 July 2008); doi: 10.1117/12.802622
Show Author Affiliations
Craig Brown, Univ. of Leicester, Space Research Ctr. (United Kingdom)
Richard M. Ambrosi, Univ. of Leicester, Space Research Ctr. (United Kingdom)
Tony Abbey, Univ. of Leicester, Space Research Ctr. (United Kingdom)
Olivier Godet, Univ. of Leicester, Space Research Ctr. (United Kingdom)
R. O'Brien, Univ. of Leicester, Space Research Ctr. (United Kingdom)
M. J. L. Turner, Univ. of Leicester, Space Research Ctr. (United Kingdom)
Andrew Holland, The Open Univ., Planetary and Space Science Research Institute (United Kingdom)
Peter J. Pool, E2V Technologies (United Kingdom)
David Burt, E2V Technologies (United Kingdom)
David Vernon, Univ. of Leicester, Space Research Ctr. (United Kingdom)


Published in SPIE Proceedings Vol. 7011:
Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray
Martin J. L. Turner; Kathryn A. Flanagan, Editor(s)

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