Patent ID: 7851352
Filing Date: 2010-12-14
Classification: G06K,H01L

Abstract:
1. A method for manufacturing a semiconductor device comprising: forming an island-like semiconductor film over an insulating substrate; forming a gate insulating film over the island-like semiconductor film; forming a gate electrode over the gate insulating film; forming a pair of impurity regions by introducing an impurity element into the island-like semiconductor film using the gate electrode as a mask; forming a first metal film in a region in contact with the pair of impurity regions, and in a region located over the gate electrode and overlapping with the gate electrode; forming a second metal film which functions as a reflective film in a region located over the first metal film and overlapping with the gate electrode; removing parts of the second metal film to expose parts of the first metal film which is in contact with the pair of impurity regions; and irradiating the exposed parts of the first metal film and the second metal film with laser light to heat the first metal film selectively to selectively cause a reaction between the island-like semiconductor film and the first metal film in the region in contact with the pair of impurity regions.