Patent ID: 8420512

Claim:
A method for manufacturing a semiconductor device, the method comprising the steps of: (a) irradiating a first pulse laser beam of an excimer laser to a surface of a semiconductor, thereto a dopant ion is implanted, with an irradiation energy density 1.0 J/cm 2 or higher and 1.4 J/cm 2 or lower for blowing off particles on the surface of the semiconductor, which leaves no machining trace; and (b) irradiating a second pulse laser beam of an excimer laser to the surface of the semiconductor with an irradiation energy density 0.6 J/cm 2 or higher and 1.4 J/cm 2 or lower to activate an impurity layer, thereto the dopant ion is implanted, which leaves no machining trace in the surface of the semiconductor.