NDLI: The effect of pixel geometry on spatial and spectral resolution in a CdZnTe imaging array

Content Provider	IEEE Xplore Digital Library
Author	Eskin, J.D. Barrett, H.H. Barber, H.B. Woolfenden, J.M.
Copyright Year	1996
Description	Author affiliation: Arizona Univ., Tucson, AZ, USA (Eskin, J.D.; Barrett, H.H.; Barber, H.B.; Woolfenden, J.M.)
Abstract	We analyze the various factors contributing to the spatial and spectral resolution of a focal plane imager made from a 25 mm square slab of CdZnTe patterned into an array of pixels. Each pixel is connected to a charge-sensitive preamplifier that integrates the current flowing through the pixel electrode for a frame time of one millisecond. The fraction of charge collected by the integrating circuit is influenced by two trends. Some signal is lost to neighboring pixels due to nonlocalized generation and subsequent diffusion of charge carriers. An opposing phenomenon we term the "near-field effect" has a greater influence on charge collection as well as spatial resolution. We show using electrostatic theory that the smaller the pixel dimension, the more electron transport contributes to the induced signal, and the less hole transport matters. The result is an improved pulse-height spectrum with less tailing due to trapped charges. Monte Carlo simulations and measurements on test pixels confirm the improvement in pulse height spectrum with smaller pixel dimension. Numerical calculation of the potential distribution within the detector volume allows us to include the effect of inter-pixel spaces in the simulations.
Starting Page	544
Ending Page	548
File Size	539924
Page Count	5
File Format	PDF
ISBN	078033180X
DOI	10.1109/NSSMIC.1995.504320
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-10-21
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Geometry Spatial resolution Pulse measurements Image analysis Pattern analysis Image resolution Slabs Pixel Preamplifiers Electrodes
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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