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Theoretical evaluation of MTF and charge collection efficiency in CCD and CMOS image sensor

Djité, Ibrahima and Magnan, Pierre and Estribeau, Magali and Petit, Sophie and Rolland, Guy and Saint-Pé, Olivier Theoretical evaluation of MTF and charge collection efficiency in CCD and CMOS image sensor. (2009) In: Proceedings of SPIE Optical engineering Applications, 2 August 2009 - 6 August 2009 (San Diego, United States).

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Official URL: http://dx.doi.org/10.1117/12.824375


Classical models used to calculate the Modulation Transfer function (MTF) of a solid-state image sensor generally use a sinusoidal type of illumination. The approach, described in this paper, consists in considering a point-source illumination to built a theoretical three dimensional model of the diffusion and the collection of photo-carriers created within the image sensor array. Fourier transform formalism is used for this type of illumination. Solutions allow to evaluate the spatial repartition of the charge density collected in the space charge region, i.e. to get the Pixel Response Function (PRF) formulation. PRF enables to calculate analytically both MTF and crosstalk at every needed wavelengths. The model can take into account a uniformly doped substrate and an epitaxial layer grown on a highly doped substrate. The built-in electric field induced by the EPI/Substrate doping gradient is also taken into account. For these configurations, MTF, charge collection efficiency and crosstalk proportion are calculated. The study is established in the case of photodiode pixel but it can be easily extended to pinned photodiode pixels and photogate pixels.

Item Type:Conference or Workshop Item (Paper)
Additional Information:Proceeding of Proceeding of SPIE Optical engineering +Applications 2009 in Optical Modeling and performance predictions, 02-06 August 2009, San Diego, USA Copyright 2009 Society of Photo-Optical Instrumentation Engineers. This paper was published in Proceedings of the Spie, vol. 7427 and is made available as an electronic reprint with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes,or modification of the content of the paper are prohibited.
Audience (journal):International peer-reviewed journal
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > EADS - Astrium (FRANCE)
French research institutions > Centre National d'Études Spatiales - CNES (FRANCE)
Laboratory name:
Département d'Electronique, Optronique et Signal - DEOS (Toulouse, France) - Conception d’Imageurs Matriciels Intégrés - CIMI
Deposited On:10 Sep 2009 08:24

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