Patent ID: 7466735
Filing Date: 2008-12-16
Classification: B23K,H01L

Abstract:
1. A manufacturing method of a semiconductor device comprising: forming a crystalline semiconductor film over a substrate; doping an impurity element to the crystalline semiconductor film; extending first and second laser beams emitted from at least first and second laser oscillators wherein each of the first and second laser beams is an ellipsoid shape having an e activating the impurity element introduced in the crystalline semiconductor film by directing the first and second laser beams to the crystalline semiconductor film so that one edge of the first laser beam overlaps with one edge of the second laser beam in the longitudinal direction of the first and second laser beams, wherein the following relation is satisfied when center coordinates of the first and second laser beams are (x, y) and (x′, y′), respectively, an X axis is drawn in parallel with said major diameter, and Y axis is drawn in parallel with the minor diameter: wherein a, b, x, x′, y, and y′ are positive numbers.