Patent ID: 6828179
Filing Date: 2004-12-07
Classification: H01L

Abstract:
A method for manufacturing a semiconductor device comprising:forming a first amorphous semiconductor film comprising germanium in a ratio of 0.1 to 10 atom percent to silicon; adding an element having a catalytic action for crystallization to the first amorphous semiconductor film; carrying out a first crystallizing process with a heating process in an inert gas; carrying out a second crystallizing process with radiation of a laser light in an oxidizing atmosphere to form a first crystalline semiconductor film; reducing a thickness of the first crystalline semiconductor film by an etching process; forming a second amorphous semiconductor film comprising silicon on the first crystalline semiconductor film; crystallizing the second amorphous semiconductor film in an inert gas to form a second crystalline semiconductor film; and patterning the first and second crystalline semiconductor films in order to form at least one active layer.