Theory of te precipitation and related effects in CdTe Crystals

Revealing of defects in CdTe crystals by DSL etching

“…A close examination of this image reveals that the arms of the star are parallel to the sides of the triangle formed by the Te inclusions. According to ref [7] these directions coincide with the <110> directions, which correspond to the lowest surface energy in the zinc blend structure [20]. These are also the directions of easy glide systems in this lattice.…”

Internal Electric Field Investigations of a Cadmium Zinc Telluride Detector Using Synchrotron X-ray Mapping and Pockels Effect Measurements

“…The process continues in this way until the entire excess of Te has precipitated. 12 In addition, Hirsh's investigations suggest that such star defects might be due to the interaction of moving dislocations with inclusions or precipitates. 13 There were no precipitates inside these stars noted with the infrared (IR) microscope during this investigation.…”

Observations on Nanoscale Te Precipitates in CdZnTe Crystals Grown by the Traveling Heater Method Using High Resolution Transmission Electron Microscopy

“…The orientation relationship between Te precipitates and CZT matrix is derived to be 112 M //[0001] P and 111 M // 1100 P . Under hydrostatic pressure, element Te may undergo pressure-induced phase transitions from trigonal to monoclinic at about 40 kbar and from monoclinic to rhombohedral phase at about 70 kbar, respectively [14][15][16]. Final structures of Te precipitates are therefore decided by the internal droplet pressures.…”

“…Rai et al [8] characterized the density and size of Te precipitates in CZT crystals grown by Bridgman method. Te precipitates were identified to possess an average size of 20 nm and a density of 1.3 × 10 16 cm −3 in the as-grown CZT crystal. Wang et al [9] further studied the crystal structure of Te precipitates in CZT crystals, and three structure types (i.e., hexagonal, monoclinic, and high-pressure rhombohedral structures) were characterized.…”