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Improving quantum efficiency and spectral resolution of a CCD through direct manipulation of the depletion region

Brown, C.; Ambrosi, R. M.; Abbey, T.; Godet, O.; O'Brien, R.; Turner, M. J. L.; Holland, A.; Pool, P. J.; Burt, D. and Vernon, D. (2008). Improving quantum efficiency and spectral resolution of a CCD through direct manipulation of the depletion region. In: Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 23-28 June 2008, Marseille, France.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1117/12.802622
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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.

Item Type: Conference Item
Copyright Holders: 2008 SPIE - The International Society for Optical Engineering
ISSN: 0277-786X
Keywords: CCD; X-ray; depletion; quantum efficiency; Monte Carlo; EPIC-MOS CCDS
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 20906
Depositing User: Karen Guyler
Date Deposited: 20 Apr 2010 13:40
Last Modified: 02 Dec 2010 20:52
URI: http://oro.open.ac.uk/id/eprint/20906
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