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- Title
Space-Charge Manipulation Under Sub-bandgap Illumination in Detector-Grade CdZnTe.
- Authors
Guo, Rongrong; Jie, Wanqi; Xu, Yadong; Zha, Gangqiang; Wang, Tao; Lin, Yun; Zhang, Mengmeng; Du, Zhuotong
- Abstract
The effects of sub-bandgap illumination on the charge transport process and detector performance were experimentally studied in detector-grade CdZnTe. Based on the resulting bulk resistivity and photocurrent response under sub-bandgap illumination, the variation of the deep-level occupation fraction was identified according to a modified Shockley-Read-Hall model. From laser-beam-induced transient current measurements, a decrease of negative space-charge density and consequently flattening of the electric field distribution were found under external sub-bandgap illumination, demonstrating a reduction of the active trap concentration. Furthermore, Am gamma-ray spectroscopy response measurements confirmed that simultaneous incidence of sub-bandgap light could significantly improve CdZnTe detector energy resolution and charge collection efficiency.
- Subjects
SPACE-charge limited devices; LIGHTING; PHOTOCURRENTS; ELECTRICAL resistivity; GAMMA-ray absorption
- Publication
Journal of Electronic Materials, 2015, Vol 44, Issue 10, p3229
- ISSN
0361-5235
- Publication type
Article
- DOI
10.1007/s11664-015-3835-0