Published online by Cambridge University Press: 25 February 2011
The temperature dependent competition between solid phase epitaxy and randomcrystallization in ion-implanted (As+, B+, F+, and BF2+) silicon films is investigated. Measurements of time-resolvedreflectivity during cw laser heating show that in the As+, F+, and BF2+-implanted layers (conc 4×1020cm-3)epitaxial growth is disrupted at temperatures 1000°C. This effect is notobserved in intrinsic films or in the B+-implanted layers.Correlation with results of microstructural analyses and computer simulationof the reflectivity experiment indicates that disruption of epitaxy iscaused by enhancement of the random crystallization rate by arsenic andfluorine. Kinetics parameters for the enhanced crystallization process aredetermined; results are interpreted in terms of impurity-catalyzednucleation during the random crystallization process.