DIFFUSION OF POINT-DEFECTS IN SILICON-CRYSTALS DURING MELT-GROWTH .2. ONE DIFFUSER MODEL

We introduce the phenomenological equations which describe the diffusion of one species of point defects in silicon single crystals during melt-growth. The chemical potential of point defects frozen into the crystal during CZ crystal growth is estimated, and the formation mechanism of the OSF-ring in CZ crystal is discussed with the equations thus developed. It was shown that the phenomenological diffusion equations can explain well the dependence of the location of the OSF-ring in CZ-crystals on crystal growth rate, and disappearance of the OSF-ring at low growth rate. The OSF-ring is proposed to be generated at the peak of the chemical potential of point defects frozen into the crystal.