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Guoqiang Yang,Shali Xiao,Yuedong Ma,Liuqiang Zhang 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.4
A capacitive Frisch-grid CdZnTe detector with different lengths of the Frisch rings has beenfabricated, and the influence of infrared (IR) stimulation on the spectral performance of the detectorhas been investigated. IR stimulation at a wavelength (940 nm), close to the absorption edge ofthe CdZnTe, was found to improve the detector’s spectral performance significantly. IR radiationwas noted to influence the detector’s sensitivity, changing the equilibrium between free and trappedcarriers and improving the charge collection. The degree of improvement was different for detectorswith different lengths of the Frisch rings and depended on the weighting potential distribution andthe 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 μW) of IRillumination for the capacitive Frisch-grid CdZnTe detector with an 8-mm-long Frisch ring. Goodenergy resolution could be obtained even at low operating voltages.