Patent ID: 7521303

Claim:
A method of fabricating thin film transistor using a crystallized amorphous semiconductor thin film, the method comprising the steps of: forming an amorphous semiconductor thin film on a substrate; forming at least one crystallization induced metal pattern at a predetermined location on the upper portion of the amorphous semiconductor thin film; performing a first crystallization of said amorphous semiconductor thin film by a first heat treatment of said amorphous semiconductor thin film thereby crystallizing said amorphous semiconductor thin film in a vicinity of said predetermined location of said at least one crystallization induced metal pattern, including crystallization of said amorphous semiconductor thin film at an area thereof beneath and covered by said at least one crystallization induced metal pattern via a MIC (Metal Induced Crystallization) method, and crystallization of said amorphous semiconductor thin film laterally adjacent to said area thereof via a MILC (Metal Induced Lateral Crystallization) method, respectively, a portion of said amorphous semiconductor thin film remaining in an amorphous state after said first crystallization, forming a partially crystallized amorphous semiconductor thin film; selectively injecting N-type impurities into said partially crystallized amorphous semiconductor thin film subsequent to said first crystallization by said first heat treatment to form a source region and a drain region of the thin film transistor; and performing a second crystallization of said partially crystallized amorphous semiconductor thin film by a second heat treatment of said partially crystallized amorphous semiconductor thin film via the MILC method subsequent to said N-type impurity injection, wherein said second crystallization crystallizes said partially crystallized amorphous semiconductor thin film in a channel region defined in said portion of said partially crystallized amorphous semiconductor thin film remaining in the amorphous state between said source region and said drain region.