Measurement of the diffusivity of CdTe in liquid Te at crystal growth temperatures

The diffusivity of CdTe in tellurium-rich liquid solution was measured by dissolving solid samples at temperatures applicable to THM crystal growth. We calculated the resulting diffusion coefficients to be 0.008mm2/s at 850°C and 0.009mm2/s at 900°C. The CdTe was dissolved under isothermal condition...

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Veröffentlicht in:Journal of crystal growth 2015-02, Vol.411, p.30-33
Hauptverfasser: Roszmann, J., Sekhon, M., Dost, S.
Format: Artikel
Sprache:eng
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Zusammenfassung:The diffusivity of CdTe in tellurium-rich liquid solution was measured by dissolving solid samples at temperatures applicable to THM crystal growth. We calculated the resulting diffusion coefficients to be 0.008mm2/s at 850°C and 0.009mm2/s at 900°C. The CdTe was dissolved under isothermal conditions in 7mm diameter quartz tubes for 45min, 90min and 180min. The diffusivity was calculated from the distance travelled by the dissolution interface using a 1D transport model. Measurement of the solution composition by EDS confirms that the experiments were diffusion-dominated, and the calculated diffusivities match those predicted elsewhere ab initio for similar conditions. •We dissolved CdTe in tellurium under isothermal conditions at 850°C and 900°C.•The diffusivity of CdTe in Te was measured to be 0.008mm2/s at 850°C and 0.009mm2/s at 900°C.•An analytical 1D model was used to calculate the diffusivity.•Measurement of the composition of the quenched solution by EDS confirms that transport in the system was diffusion-dominated.
ISSN:0022-0248
1873-5002
DOI:10.1016/j.jcrysgro.2014.10.051