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3D Medipix2 detector characterization with a micro-focused X-ray beam

DOI: 10.1016/j.nima.2010.06.140 DOI Help

Authors: E. N. Gimenez-navarro (Diamond Light Source) , J. Marchal (Diamond Light Source) , K. J. S. Sawhney (Diamond Light Source) , L. Alianelli (Diamond Light Source) , M. Lozano (Centro Nacional de Microelectrónica, (IMB-CNM, CSIC), Barcelona) , Giulio Pellegrini (Centro Nacional de Microelectrónica, (IMB-CNM, CSIC), Barcelona) , C. Fleta (CNM-Centro Nacional de Microelectrónica, (IMB-CNM, CSIC), Barcelona) , V. O'shea (University of Glasgow) , R. Bates (University of Glasgow) , C. Parkes (University of Glasgow) , A. Mac Raighne (University of Glasgow) , D. Maneuski (University of Glasgow) , N. Tartoni (Diamond Light Source)
Co-authored by industrial partner: No

Type: Conference Paper
Conference: IWORID 2009- International Workshop on Radiation Imaging Detectors
Peer Reviewed: No

State: Published (Approved)
Published: July 2010
Diamond Proposal Number(s): 520

Abstract: Three-dimensional (3D) photodiode detectors offer advantages over standard planar photodiodes in a wide range of applications. The main advantage of these sensors for X-ray imaging is their reduced charge sharing between adjacent pixels, which could improve spatial and spectral resolution. However, a drawback of 3D sensors structures is the loss of detection efficiency due to the presence in the pixel structure of heavily doped electrode columns which are insensitive to X-ray. In this work two types of 3D silicon detectors: n-type wafer with hole collecting readout-columns (n-type) and p-type wafer with electron collecting readout-columns (p-type), bump-bounded to a Medipix2 read-out chip were characterized with a 14.5 keV micro-focused X-ray beam from a synchrotron. Measurements of the detection efficiency and the charge sharing were performed at different bias voltages and Medipix2 energy thresholds and compared with those of a standard planar silicon sensor.

Journal Keywords: Pixel Detector; X-Ray Scattering; X-Ray Diffraction; Synchrotron

Subject Areas: Physics

Instruments: B16-Test Beamline

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