Thermal annealing of gold deposited contacts on high resistivity p-type CdTe nuclear detectors

Effects of low-temperature annealing on Ohmic contact of Au/p-CdZnTe

“…Mergui et al [6] reported that CdZnTe detectors had better detective performance after annealing in air than those annealed in vacuum or hydrogen atmosphere. Chattopadhyay et al [7] proved that the detective performance of Au/CdZnTe was descended after 10 h annealing at 423-473 K in vacuum.…”

“…The electron affinity of p-CdZnTe is about 4.7 eV, which requires electrode metals with higher work function than its electron affinity to form ohmic contact. Au with the work function of 4.7-5.0 eV and Pt of 5.2-5.3 eV are usually used as electrode metals with vacuum evaporation, sputtering or electroless methods [1][2][3][4][5][6][7][8]. However, even suitable electrode materials are selected, it is still difficult to obtain good ohmic contact because of CdZnTe surface state.…”

The comprehensive evaluation of the structural and functional properties of the gas- statically treated Au–CdZnTe–Au structures for X- and gamma-ray detectors

“…(Ilchuk et al, 2000;Mergui et al, 1992;Bedny, 1999). The barrier modification is caused by the fact that, under thermal annealing, the morphology and the chemical composition of the region directly under the contact changes.…”

Purification, Growth, Fabrication and Characterization of Wide Bandgap Materials for Gamma-Ray Detectors

“…The need is best met by the use of ohmic contacts. The dark currents often have a higher level in detectors with ohmic contacts as compared with blocking contact detectors; however, they prevent the accumulation of space charge layers [7] which distort the internal electric field.…”