Two-dimensional modeling of Cd(Zn)Te strip detectors

Author

Heanue, J.A. ; Brown, J.K. ; Hasegawa, B.H.

Author_Institution

California Univ., San Francisco, CA, USA

Volume

44

Issue

3

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

701

Lastpage

707

Abstract

Although there has been significant recent progress in the development of CdTe and CdZnTe radiation detectors, these materials are still plagued by charge trapping and recombination problems. Recent work has shown that fabrication of arrays with small anodes can overcome these problems to some extent. The purpose of this simulation study was to investigate this small anode effect in relatively large strip detectors of various geometries. Unlike previous simulations, the current study includes the effects of both trapping and detrapping, significant inter-pixel spacing, and non-linear electric field profiles. In addition, the methods have the potential to account efficiently for spatial variations in trapping behavior and for multiple trapping levels. The results of the simulation predict that 8 mm thick strip detectors with 1 mm anode thickness and 0.3 mm anode spacing will provide adequate performance for our medical imaging application

Keywords

II-VI semiconductors; cadmium compounds; electron traps; electron-hole recombination; hole traps; semiconductor counters; zinc compounds; CdTe; CdTe radiation detectors; CdZnTe; CdZnTe radiation detectors; charge recombination problems; charge trapping; inter-pixel spacing; medical imaging application; multiple trapping levels; nonlinear electric field profiles; trapping behavior; Anodes; Cadmium compounds; Electron traps; Fabrication; Geometry; Medical simulation; Radiation detectors; Radiative recombination; Solid modeling; Strips;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.603737

Filename

603737