Abstract
ZnSe single crystals were grown by closed-tube chemical vapour transport at temperatures below 800°C. In the ZnSe-I2 transport system studies have been performed to elaborate the influence of different heat and mass transport mechanisms on effects of nucleation and crystal growth. The transport of ZnSe, which is assumed to be composed of diffusion, Stefan flow and convection, was calculated by a numerical model. In the total pressure range between 0.5 and 2 atm, qualitative agreement has been found between the experimental transport rates and the theoretical ones. Experimental variables were the system pressure, temperature conditions, the concentration of the transport agent, and the aspect ratio of the ampoule. In contrast to convection controlled systems, mainly diffusion-limited mass transport reduces nucleation density and favours the growth of large ZnSe crystals of good crystallographic perfection.
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