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

• Published in: Journal of crystal growth Vol. 411; pp. 30 - 33
• Main Authors: Roszmann, J., Sekhon, M., Dost, S.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2015
• Subjects: A1. Diffusion; A1. Mass transfer; A2. Growth from solutions; B1. Cadmium compounds; Cadmium tellurides; Crystal growth; Diffusion; Diffusion coefficient; Diffusivity; Dissolution; Liquids; Mathematical models; Tubes; B1. Cadmium compounds; A1. Mass transfer; A2. Growth from solutions; A1. Diffusion
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2014.10.051

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.