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...
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MDPI AG
2024-01-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/14/1/72 |
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| author | Oleg Nefedov Alexey Dovnarovich Vladimir Kostikov Elena Mozhevitina Dmitry Bocharnikov Igor Avetissov |
| author_facet | Oleg Nefedov Alexey Dovnarovich Vladimir Kostikov Elena Mozhevitina Dmitry Bocharnikov Igor Avetissov |
| author_sort | Oleg Nefedov |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-08T09:55:02Z |
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| id | doaj.art-945edeab59c74f959a30c2d79c2e5b71 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-08T09:55:02Z |
| publishDate | 2024-01-01 |
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| series | Crystals |
| spelling | doaj.art-945edeab59c74f959a30c2d79c2e5b712024-01-29T13:51:26ZengMDPI AGCrystals2073-43522024-01-011417210.3390/cryst14010072Numerical Simulation of CdTe Crystal Growth Using the Vertical Gradient Freeze Technique Assisted by Axial Low-Frequency Oscillations of the MeltOleg Nefedov0Alexey Dovnarovich1Vladimir Kostikov2Elena Mozhevitina3Dmitry Bocharnikov4Igor Avetissov5Department of Chemistry and Technology of Crystals, D. Mendeleev University of Chemical Technology of Russia (MUCTR), Moscow 125480, RussiaDepartment of Chemistry and Technology of Crystals, D. Mendeleev University of Chemical Technology of Russia (MUCTR), Moscow 125480, RussiaDepartment of Chemistry and Technology of Crystals, D. Mendeleev University of Chemical Technology of Russia (MUCTR), Moscow 125480, RussiaDepartment of Chemistry and Technology of Crystals, D. Mendeleev University of Chemical Technology of Russia (MUCTR), Moscow 125480, RussiaDepartment of Chemistry and Technology of Crystals, D. Mendeleev University of Chemical Technology of Russia (MUCTR), Moscow 125480, RussiaDepartment of Chemistry and Technology of Crystals, D. Mendeleev University of Chemical Technology of Russia (MUCTR), Moscow 125480, RussiaThe 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.https://www.mdpi.com/2073-4352/14/1/72crystal growthnumerical simulationcadmium telluridevertical gradient freezing |
| spellingShingle | Oleg Nefedov Alexey Dovnarovich Vladimir Kostikov Elena Mozhevitina Dmitry Bocharnikov Igor Avetissov Numerical Simulation of CdTe Crystal Growth Using the Vertical Gradient Freeze Technique Assisted by Axial Low-Frequency Oscillations of the Melt Crystals crystal growth numerical simulation cadmium telluride vertical gradient freezing |
| title | Numerical Simulation of CdTe Crystal Growth Using the Vertical Gradient Freeze Technique Assisted by Axial Low-Frequency Oscillations of the Melt |
| title_full | Numerical Simulation of CdTe Crystal Growth Using the Vertical Gradient Freeze Technique Assisted by Axial Low-Frequency Oscillations of the Melt |
| title_fullStr | Numerical Simulation of CdTe Crystal Growth Using the Vertical Gradient Freeze Technique Assisted by Axial Low-Frequency Oscillations of the Melt |
| title_full_unstemmed | Numerical Simulation of CdTe Crystal Growth Using the Vertical Gradient Freeze Technique Assisted by Axial Low-Frequency Oscillations of the Melt |
| title_short | Numerical Simulation of CdTe Crystal Growth Using the Vertical Gradient Freeze Technique Assisted by Axial Low-Frequency Oscillations of the Melt |
| title_sort | numerical simulation of cdte crystal growth using the vertical gradient freeze technique assisted by axial low frequency oscillations of the melt |
| topic | crystal growth numerical simulation cadmium telluride vertical gradient freezing |
| url | https://www.mdpi.com/2073-4352/14/1/72 |
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