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The spectra characteristic of capacitive virtual Frisch grid detectors with different directions

ZHUBIN SHI1, LINJUN WANG1,* , KAIFENG QIN1, JIAHUA MIN1, JIJUN ZHANG1, XIAOYAN LIANG1, JIAN HUANG1, KE TANG1, YIBEN XIA1

Affiliation

  1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

Abstract

Recent years, CdZnTe detectors have captured great interests in the field of gamma ray detection for their special characteristics. The configuration of virtual Frisch grid detector has better charge collection efficiency (CCE) than normal planar detector. In our study we introduce capacitive virtual Frisch grid structure and Schottky contact to further reduce the leakage current which can be confirmed in current-voltage (I-V) curves. The spectra response of the different directions in capacitive virtual Frisch grid CdZnTe detectors seem subtle different and independent of both material characteristics and fabricating process, furthermore their trends have been obtained. The primary results show that it is possible to detect the both directions of the radioactive source and radioisotope in hand-held gamma-ray instruments. More experiments need to do in the wide range of CdZnTe material and various radioactive sources to clear these results..

Keywords

CdZnTe detector; Capacitive virtual Frisch grid; Spectra.

Submitted at: Jan. 3, 2012
Accepted at: June 6, 2012

Citation

ZHUBIN SHI, LINJUN WANG, KAIFENG QIN, JIAHUA MIN, JIJUN ZHANG, XIAOYAN LIANG, JIAN HUANG, KE TANG, YIBEN XIA, The spectra characteristic of capacitive virtual Frisch grid detectors with different directions, Journal of Optoelectronics and Advanced Materials Vol. 14, Iss. 5-6, pp. 497-503 (2012)