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Analytical investigation of correlated charge collection in CCDs

Weatherill, D. P.; Stefanov, K. D.; Holland, A. D. and Jordan, D. (2015). Analytical investigation of correlated charge collection in CCDs. Journal of Instrumentation, 10(2), article no. C02002.

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Correlated charge collection phenomena in CCD sensors are presently of interest due to their potentially major implications in space and ground based astronomy missions. These effects may manifest as a signal dependent Point Spread Function (PSF), or as a nonlinearity in the Photon Transfer Curve (PTC). We present the theoretical background to a simple analytical model based on previously published solutions of Poisson's equation which aims to aid conceptual understanding of how various device parameters relate to the magnitude of correlated charge collection. We separate correlated charge collection into two components - firstly excess diffusion caused by increasing drift time as the electric field in the device decreases, which is isotropic, and secondly anisotropic pixel boundary shifting as the fringing field in the parallel transfer direction collapses. Equations are presented which can be solved numerically to give reasonable detail, or solved analytically using simplifying approximations.

Item Type: Journal Item
Copyright Holders: 2015 IOP Publishing Ltd and Sissa Medialab srl
ISSN: 1748-0221
Extra Information: 14 pp

Part of 10th International Conference on Position Sensitive Detectors
Keywords: photon detectors; detector modelling and simulations
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Centre for Electronic Imaging (CEI)
Item ID: 42058
Depositing User: Daniel Weatherill
Date Deposited: 13 Feb 2015 09:21
Last Modified: 10 Dec 2018 14:53
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