Funct. Mater. 2024; 31 (4): 574-586.

doi:https://doi.org/10.15407/fm31.04.574

Optimization of CZT crystal growth by THM method

S. Galkin, O. Kolesnikov, I. Rybalka, O. Lalayants

Institute for Scintillation Materials of the National Academy of Sciences of Ukraine

Abstract: 

This work develops a numerical model for analyzing the growth conditions of Cd0.9Zn0.1Te crystals by the traveling heater method (THM) in a multi-zone electrodynamics gradient (EDG) furnace. The main focus is on determining the temperature profile and the thickness of the Te-rich solution to improve the structural homogeneity of the crystals and minimize defects. The work also proposes a dimensionless criterion based on the ratio of the thermal Rayleigh number (RaT) to the concentration Rayleigh number (RaC), which allows for evaluating the growth conditions. The calculations performed make it possible to determine the main technological parameters that ensure a nearly flat crystallization interface. The adequacy of the calculated thermal conditions was confirmed experimentally. The obtained samples showed characteristics suitable for manufacturing spectroscopic grade detectors.

Keywords: 
CZT, THM method, numerical model, growing conditions.

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