Analytical investigation of correlated charge collection in CCDs

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 (P...

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Bibliographic Details
Published in:Journal of instrumentation 2015-02, Vol.10 (2), p.C02002-C02002, Article C02002
Main Authors: Weatherill, D.P., Stefanov, K.D., Holland, A.D., Jordan, D.
Format: Article
Language:English
Subjects:
Charge
Charge (electric)
Collection
Correlation
Correlation analysis
Devices
Mathematical analysis
Mathematical models
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Summary: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.
ISSN:1748-0221
1748-0221
DOI:10.1088/1748-0221/10/02/C02002