Volume 27 Issue 07
Jun.  2015
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Article Navigation >  High Power Laser and Particle Beams  > 2015  >  27(07): 076001
Lei Chunxia, Ren Yunpeng, Gan Yong, et al. Effect of optical properties on the thermal responses of copper films induced by ultrafast lasers[J]. High Power Laser and Particle Beams, 2017, 29: 071006. doi: 10.11884/HPLPB201729.170017
Citation: Yang Guoqiang, Xiao Shali, Ma Yuedong, et al. Spectroscopic characteristics of common-grid pixelated CdZnTe detectors[J]. High Power Laser and Particle Beams, 2015, 27: 076001. doi: 10.11884/HPLPB201527.076001
shu

Spectroscopic characteristics of common-grid pixelated CdZnTe detectors

doi: 10.11884/HPLPB201527.076001
  • 1.

    Key Laboratory of Optoelectronic Technology and Systems,Ministry of Education,Chongqing University,Chongqing 400044,China;

  • 2.

    Institute of Electronic Engineering,CAEP,P.O.Box 919-521,Mianyang 621900,China

  • Received Date: 2015-01-04
  • Rev Recd Date: 2015-04-06
  • Publish Date: 2015-06-23
    Abstract
  • A 44 common-grid pixelated CdZnTe detector with different pixel sizes is designed and fabricated using the CdZnTe crystal. By the spectra measurement combined with weighting potential and electric field simulation, the small pixel effect and guide effect in common-grid pixelated CdZnTe detector are investigated. Results show that the spectroscopic characteristics of lager pixels are degraded since the small pixel effect is not strong enough to remove the hole trailing. While the spectroscopic characteristics of smaller pixels are also degraded since the serious charge loss in volume and surface layer between pixels and common-grid. An optimal energy resolution of 3.80% FWHM at 662 keV(137Cs radiation source) is obtained from the 0.8 mm wide pixel. Excessive high bias voltage increases the surface leakage current between pixels and common-grid, which in turn degrades the spectroscopic characteristics. The optimal bias voltage is -60 V for 0.8 mm wide pixel.
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