Abstract
The growth of (Cd,Zn)Te (CZT) crystals and the improvement of the crystal quality are part of a research project towards experiments under microgravity using the Traveling Heater Method (THM). In order to determine the experimental parameters, we performed a detailed ground-based program. Three CZT crystals with a nominal Zn content of 10% were grown using THM from a Te-rich solution. The size and distribution of the Te inclusions were evaluated by transmission infrared microscopy (IR). From the three-dimensional mapping of the inclusions, we observed striation-like patterns in all of the crystals. The correlation between the growth parameters and the formation of these striations was explored and discussed. We found that the inclusion striations are related to periodic temperature variations.
Highlights
Striations in (Cd,Zn)Te CrystalsThe application of (Cd,Zn)Te (CZT) in radiation detectors demands high-quality CZT crystals with a larger volume and high resistivity
We have focused on investigating the relation between the growth process and the formation of secondary phase Te inclusions
A rotating magnetic field of 2 mT at a frequency of 100 Hz was induced during translation for two crystals, while one was grown without applying a magnetic field (Table 1)
Summary
The application of (Cd,Zn)Te (CZT) in radiation detectors demands high-quality CZT crystals with a larger volume and high resistivity. The growth of high-quality CZT crystals with a low number of defects and high compositional homogeneity remains a challenge. It has become apparent that convection has a strong influence on the heat and mass transport, interface stability and, the compositional uniformity of the grown crystal [6,7,8]. Establishing the effects of microgravity conditions involving convection on the morphology, impurities incorporation, structural defects, induced strain and compositional uniformity is of great scientific significance for the improvement of crystal growth on
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