Numerical Simulation of CdTe Crystal Growth Using the Vertical Gradient Freeze Technique Assisted by Axial Low-Frequency Oscillations of the Melt

The problem of intensification of the melt crystal growth process has been analyzed using CdTe as an actual material. Numerical simulation of 100 mm diameter CdTe crystal growth using the VGF technique has been carried out. The heat–mass transfer was controlled by introducing low-frequency oscillati...

Full description

Saved in:
Bibliographic Details
Published inCrystals (Basel) Vol. 14; no. 1; p. 72
Main Authors Nefedov, Oleg, Dovnarovich, Alexey, Kostikov, Vladimir, Mozhevitina, Elena, Bocharnikov, Dmitry, Avetissov, Igor
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.01.2024
Subjects
Analysis
Approximation
Bridgman method
Cadmium telluride
Cooling rate
Crystal growth
Crystallization
Crystals
Heat conductivity
High temperature
Homogeneity
Latent heat
Mass transfer
Methods
Numerical analysis
numerical simulation
Simulation
Simulation methods
Solid solutions
Temperature
Thermal properties
vertical gradient freezing
Wurtzite
Online AccessGet full text

Cover

More Information
Summary:The problem of intensification of the melt crystal growth process has been analyzed using CdTe as an actual material. Numerical simulation of 100 mm diameter CdTe crystal growth using the VGF technique has been carried out. The heat–mass transfer was controlled by introducing low-frequency oscillating baffle into the melt, which is a so-called axial vibrational control (AVC) technique. The baffle configuration has been optimized to destroy solid “tails”, which were formed near the crucible walls at high cooling rates due to the low thermoconductivity and the corresponding latent heat. Analysis of CdTe homogeneity range showed that during fast crystal cooling, Te micro precipitations were formed, resulting from the decay of oversaturated Cd-rich nonstoichiometric solid solution during the Bridgman crystal growth technique. After full crystallization, a VGF-grown CdTe crystal stays inside the phase field of the high-temperature wurtzite polymorph. This makes it possible to go through the polymorph transition without Te micro-precipitating using the advantages of the VGF-specific feature of very slow cooling.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst14010072