Investigation of the spectral improvement of a capacitive Frisch-grid CdZnTe detector by using infrared stimulation

被引：3
|
作者：
Yang, Guoqiang [1 ]
Xiao, Shali [1 ]
Ma, Yuedong [1 ]
Zhang, Liuqiang [1 ]
机构：
[1] Chongqing Univ, Key Lab Optoelect Technol & Syst, Minist Educ, Chongqing 400044, Peoples R China
来源：
JOURNAL OF THE KOREAN PHYSICAL SOCIETY | 2014年 / 65卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Capacitive Frisch grid; CdZnTe detector; Energy resolution; Infrared stimulation; GAMMA-RAY SPECTROSCOPY; RADIATION DETECTOR; CARRIER COLLECTION; CHARGE;
D O I：
10.3938/jkps.65.441
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A capacitive Frisch-grid CdZnTe detector with different lengths of the Frisch rings has been fabricated, and the influence of infrared (IR) stimulation on the spectral performance of the detector has been investigated. IR stimulation at a wavelength (940 nm), close to the absorption edge of the CdZnTe, was found to improve the detector's spectral performance significantly. IR radiation was noted to influence the detector's sensitivity, changing the equilibrium between free and trapped carriers and improving the charge collection. The degree of improvement was different for detectors with different lengths of the Frisch rings and depended on the weighting potential distribution and the IR illumination intensity. For example, improvement was obtained in the energy resolution (FWHM) at 662 keV from 3.3% without illumination to 2.3% with a low intensity (120 mu W) of IR illumination for the capacitive Frisch-grid CdZnTe detector with an 8-mm-long Frisch ring. Good energy resolution could be obtained even at low operating voltages.
引用
收藏
页码：441 / 445
页数：5
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