Charge sharing in silicon pixel detectors

Mathieson, K., Passmore, M.S., Seller, P., Prydderch, M.L., O'Shea, V., Bates, R.L., Smith, K.M. and Rahman, M. (2002) Charge sharing in silicon pixel detectors. Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, 487(1-2), 113 -122. (doi: 10.1016/S0168-9002(02)00954-3)

Abstract

We used a pixellated hybrid silicon X-ray detector to study the effect of the sharing of generated charge between neighbouring pixels over a range of incident X-ray energies, 13-36keV. The system is a room temperature, energy resolving detector with a Gaussian FWHM of 265 eV at 5.9 keV. Each pixel is 300 mum square, 300 mum deep and is bump bonded to matching read out electronics. The modelling packages MEDICI and MCNP were used to model the complete X-ray interaction and the subsequent charge transport. Using this software a model is developed which reproduces well the experimental results. The simulations are then altered to explore smaller pixel sizes and different X-ray energies. Charge sharing was observed experimentally to be 2% at 13 keV rising to 4.5% at 36 keV, for an energy threshold of 4 keV. The models predict that up to 50% of charge may be lost to the neighbouring pixels, for an X-ray energy of 36 keV, when the pixel size is reduced to 55 mum.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Smith, Professor Kenway and Mathieson, Dr Keith
• Authors: Mathieson, K., Passmore, M.S., Seller, P., Prydderch, M.L., O'Shea, V., Bates, R.L., Smith, K.M., and Rahman, M.
• Subjects: Q Science > QC Physics
• 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
• Publisher: Elsevier
• ISSN: 0168-9002
• ISSN (Online): 1872-9576