Patent ID: 6933180

Claim:
A method of making a bottom-gate thin-film transistor comprising: forming a gate electrode on a transparent substrate; forming a gate insulating film on the gate electrode, the gate insulating film comprising a silicon oxide film formed on a silicon nitride film; forming a laminate on said gate insulating film, comprising: forming a first layer, and forming a protective insulating film having a thickness of about 100 nm or less directly on and in physical contact with said first layer without using an etching process; implanting a dopant when forming one of an LDD region and a source-drain region of the first layer through the protective insulating film without etching said protective insulating film; recovering defects formed in the protective insulating film by applying a temperature of about 600 degrees Centigrade subsequent to the dopant implanting step; activating the implanted dopant; and forming an interlayer insulating film on the protective insulating film.