Nucleation site location and its influence on the microstructure of solid-phase crystallized SiGe films

In this work, the solid-phase crystallization kinetics of amorphous SiGe fi lms deposited by low-pressure chemical-vapor deposition on oxidized Si wafe rs has been studied by x-ray diffraction, Raman spectroscopy, and ultraviol et reflectance. The microstructure of the fully crystallized films has also been analyzed using these techniques in combination with transmission elec tron microscopy. The Ge fraction of the films (x) was in the 0-0.38 interva l. The samples were crystallized at temperatures ranging from 525 to 600 de greesC. The crystallization monitored by all techniques was found to follow the Avrami model. Different crystallization behaviors are distinguished de pending on the Ge content of the films and the crystallization temperature. The results are discussed in terms of the identification of the nucleation site location and the dimensionality of the grain growth, taking into acco unt the probe depth of the different techniques and the values of the Avram i exponent derived from the crystallization curves. The preferred orientati ons of the grains, the grain morphology, the lateral grain size, the presen ce of inter- and intragrain defects, the surface roughness, and the overall crystallinity of the fully crystallized films have also been studied and r elated to the observations concerning the crystallization process. (C) 2001 American Institute of Physics.