Abstract
Ultrathin discontinuous films from a stoichiometric target of TiB 2 have been deposited on Si(001) at room temperature via pulsed laser ablation. The resulting film morphology and nanostructure was studied using transmission electron microscopy. The typical results were that the films consisted of two distinct morphologies: areas of polycrystalline nanoparticles with the hexagonal TiB 2 structure and smaller areas with epitaxial grains. The resulting epitaxial phase was verified to be cubic with a lattice parameter of 3.83 Å and aligned with TiB x (001) // Si(001), with x ∼ 2. We suggest that the cubic phase forms because of minimization of energy as a consequence of the excellent epitaxial matching of the film phase to Si(001).
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