Patent ID: 6194023
Filing Date: 2001-02-27
Classification: C23C,H01L

Abstract:
A method of manufacturing a poly-crystalline silicon film, comprising:preparing an amorphous silicon film;irradiating a preliminary laser beam from a laser annealing apparatus onto said amorphous silicon film to convert said amorphous silicon film into the poly-crystalline silicon film, said poly-crystalline film including a plurality of sections having different grain sizes;comparing a first average grain size in a first section of the poly-crystalline silicon film to a second average grain size in a second section of the poly-crystalline film to determine which section has a larder or smaller average grain size;determining, based on the comparing, a moving direction of an annealing laser beam from said laser annealing apparatus in relation to a subsequent amorphous silicon film in accordance with results obtained from said comparing of said average grain sizes of the poly-crystalline film; andcontrolling said moving direction of said annealing laser beam in relation to said subsequent amorphous silicon film to anneal a desired section of said subsequent amorphous silicon film,wherein the moving direction is selected in order to affect the average grain sizes of the desired section.