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

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Publication date: 1 February 2015
Source:Journal of Crystal Growth, Volume 411
Author(s): J. Roszmann , M. Sekhon , S. Dost
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 0.008 mm 2 / s at 850°C and 0.009 mm 2 / 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.


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