Geant4-based simulations of charge collection in CMOS Active Pixel Sensors

Esposito, Michela, Price, Tony Price, Anaxagoras, Thalis and Allinson, Nigel (2017) Geant4-based simulations of charge collection in CMOS Active Pixel Sensors. Journal of Instrumentation, 12 . ISSN 1748-0221

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Geant4-based simulations of charge collection in CMOS Active Pixel Sensors
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Item Type:Article
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Geant4 is an object-oriented toolkit for the simulation of the interaction of particles and radiation with matter. It provides a snapshot of the state of a simulated particle in time, as it travels through a specified geometry. One important area of application is the modelling of radiation detector systems. Here, we extend the abilities of such modelling to include charge transport and sharing in pixelated CMOS Active Pixel Sensors (APSs); though similar effects occur in other pixel detectors. The CMOS APSs discussed were developed in the framework of the PRaVDA consortium to assist the design of custom sensors to be used in an energy-range detector for proton Computed Tomography (pCT). The development of ad-hoc classes, providing a charge transport model for a CMOS APS and its integration into the standard Geant4 toolkit, is described. The proposed charge transport model includes, charge generation, diffusion, collection, and sharing across adjacent pixels, as well as the full electronic chain for a CMOS APS. The proposed model is validated against experimental data acquired with protons in an energy range relevant for pCT.

Keywords:CMOS imagers, Active pixel sensors, Monte Carlo methods, Geant4, proton imaging
Subjects:F Physical Sciences > F350 Medical Physics
H Engineering > H610 Electronic Engineering
Divisions:College of Science > School of Computer Science
ID Code:26915
Deposited On:05 Apr 2017 10:53

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