Patent ID: 6706568
Filing Date: 2004-03-16
Classification: C03C,H01L

Abstract:
A method for manufacturing a semiconductor device comprising:forming a semiconductor film over an insulating surface; forming an oxide film on a surface of the semiconductor film; and radiating the semiconductor film with laser beams in a first condition, a second condition and a third condition in order under an atmosphere comprising gas selected from the group consisting of hydrogen and an inert gas, wherein the laser beam in the first condition has a first energy density, a first wavelength and a first pulse width; wherein the laser beam in the second condition has a second energy density lower than the first energy density, a second wavelength and a second pulse width shorter than the first wavelength and the first pulse width, respectively; and wherein the laser beam in the third condition has a third energy density which is higher than the first energy density by 30 to 60 mJ/cm2.