Abstract
Electrode with proper contact properties is of vital importance to CdZnTe detector for high energy radiation detection. In this work, Au and Cr electrodes are prepared on CdZnTe surface using magnetron sputtering method. The surface morphology and the interface structure are analyzed using atomic force microscopy and X-ray photoelectron spectroscopy (XPS). No reaction is found at Au/CZT interface. But for Cr/CdZnTe, interface layers of CrO and Te were found, which forms a structure of Cr/Cr–O/Te/CdZnTe with a metal-insulator-metal tunnel junction. Due to this interface structure, Schottky Barrier height was tuned, which enhanced the collection efficiency and energy resolution for high energy irradiation. The energy resolution of CdZnTe detector with Cr electrode for 137Cs isotope with the energy of 662 keV reaches about 1.3%. The adhesive force of Cr is also enhanced because of the interface reaction. The results prove Cr to be a proper electrode material for CdZnTe detectors.
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