skip to main content

Title: Effects of sub-bandgap illumination on electrical properties and detector performances of CdZnTe:In

The effects of sub-bandgap illumination on electrical properties of CdZnTe:In crystals and spectroscopic performances of the fabricated detectors were discussed. The excitation process of charge carriers through thermal and optical transitions at the deep trap could be described by the modified Shockley-Read-Hall model. The ionization probability of the deep donor shows an increase under illumination, which should be responsible for the variation of electrical properties within CdZnTe bulk materials with infrared (IR) irradiation. By applying Ohm's law, diffusion model and interfacial layer-thermionic-diffusion theory, we obtain the decrease of bulk resistivity and the increase of space charge density in the illuminated crystals. Moreover, the illumination induced ionization will further contribute to improving carrier transport property and charge collection efficiency. Consequently, the application of IR irradiation in the standard working environment is of great significance to improve the spectroscopic characteristics of CdZnTe radiation detectors.
Authors:
; ; ; ; ; ; ; ; ;  [1]
  1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072 (China)
Publication Date:
OSTI Identifier:
22300010
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CADMIUM COMPOUNDS; CHARGE CARRIERS; CHARGE COLLECTION; CRYSTALS; DIFFUSION; ELECTRICAL PROPERTIES; ENERGY-LEVEL TRANSITIONS; EXCITATION; ILLUMINANCE; INDIUM ADDITIONS; IONIZATION; IRRADIATION; LAYERS; OHM LAW; RADIATION DETECTORS; SPACE CHARGE; TELLURIUM COMPOUNDS; TRAPS; ZINC COMPOUNDS