Patent ID: 7939435
Filing Date: 2011-05-10
Classification: B23K,H01L

Abstract:
1. A method of manufacturing a semiconductor device comprising: providing a semiconductor layer over a substrate with an insulating layer interposed therebetween; emitting a pulse laser light at a rate of N pulses per second; shaping the pulse laser light into a beam having a cross section perpendicular to a propagation direction of the beam, said cross section having a width and a length, wherein the length is longer than the width, wherein the beam has a width L perpendicular to the length direction, and the beam having substantially a constant energy distribution along a lengthwise direction; applying the beam to a portion of the semiconductor layer; and scanning the semiconductor layer with the beam perpendicular to the lengthwise direction of the cross section at a speed V, wherein the number of beams applied to said portion in one scan satisfies a relationship 3≦LN/V≦100, and wherein the width L is defined as a beam in a region having 5% or more of an energy density with respect to a maximum energy density of the beam on the irradiation surface.