Kinetic lattice Monte Carlo simulations were made of vacancy-assisted self-diffusion in germanium. It was shown that the effective migration energies differed greatly from the migration energy of a free vacancy; as calculated for a system with a low vacancy concentration. The vacancies were agglomerated into clusters, and free vacancies dissociated from clusters at above 657C. The nucleation temperatures of vacancy-clustering in germanium were estimated to be 617 to 657C. At below 617C, there were a few remaining free vacancies in low concentrations. In this case, the effective migration energy (0.17eV) agreed closely with the migration energy deduced from previous theoretical calculations for low vacancy concentrations. The effective migration energy (1.17eV) above 657C also agreed closely with that measured previously.

Kinetic Lattice Monte Carlo Simulation Study on Vacancy Diffusion in Germanium. J.W.Kang, O.K.Kwon, Y.G.Choi: Current Applied Physics, 2009, 9[2], e25-8