Patent ID: 7416928
Filing Date: 2008-08-26
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising the steps of: forming a gate electrode over a substrate; forming a gate insulating film over the gate electrode; forming a first amorphous semiconductor film over the gate insulating film; forming a second semiconductor film including an element selected from Group 15 of the periodic table over the first amorphous semiconductor film; patterning the first amorphous semiconductor film and the second semiconductor film including the element selected from Group 15 of the periodic table to form a first island-shaped amorphous semiconductor film and a second island-shaped semiconductor film, respectively; forming at least one of a source electrode and a drain electrode over the second island-shaped semiconductor film; removing a portion of the second island-shaped semiconductor film to form at least one of a source region and a drain region using said at least one of the source electrode and the drain electrode as a mask and reducing a thickness of the first island-shaped amorphous semiconductor film to partially expose the first island-shaped amorphous semiconductor film; adding a catalytic element, which promotes crystallization of the first island-shaped amorphous semiconductor film, into a region where the first island-shaped amorphous semiconductor film is exposed; and gettering the catalytic element by said at least one of the source region and the drain region simultaneously with crystallizing the first island-shaped amorphous semiconductor film to form an island-shaped crystalline semiconductor film by heating said at least one of the source region and the drain region and the first island-shaped amorphous semiconductor film.