The present invention generally describes one or more apparatuses and
various methods that are used to perform an annealing process on desired
regions of a substrate. In one embodiment, an amount of energy is
delivered to the surface of the substrate to preferentially melt certain
desired regions of the substrate to remove unwanted damage created from
prior processing steps (e.g., crystal damage from implant processes),
more evenly distribute dopants in various regions of the substrate,
and/or activate various regions of the substrate. The preferential
melting processes will allow more uniform distribution of the dopants in
the melted region, due to the increased diffusion rate and solubility of
the dopant atoms in the molten region of the substrate. The creation of a
melted region thus allows: 1) the dopant atoms to redistribute more
uniformly, 2) defects created in prior processing steps to be removed,
and 3) regions that have hyper-abrupt dopant concentrations to be formed.