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

Gimenez, E.N. et al. (2011) 3D Medipix2 detector characterization with a micro-focused X-ray beam. Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, 633(Sup 1), S114-S116. (doi: 10.1016/j.nima.2010.06.140)

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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: O'Shea, Professor Val and MacRaighne, Dr Aaron and Maneuski, Dr Dima and Bates, Dr Richard and Parkes, Dr Christopher
• Authors: Gimenez, E.N., Maneuski, D., MacRaighne, A., Parkes, C., Bates, R., O'Shea, V., Fleta, C., Pellegrini, G., Lozano, M., Alianelli, L., Sawhney, K.J.S., Marchal, J., and Tartoni, N.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
• ISSN: 0168-9002