Patent ID: 6050827
Filing Date: 2000-04-18
Classification: H01L,Y10S

Abstract:
A method of forming a thin film transistor on a substrate, comprising the steps of:(a) forming a gate electrode on a substrate;(b) oxidizing the gate electrode to form a gate insulating film on the gate electrode, the gate electrode and the gate insulating film forming a step;(c) forming a thin film semiconductor on the gate insulating film; and(d) forming a source and drain electrode film laminate on the thin film semiconductor, including the sub-steps of(i) forming a resist film on a first portion of the thin film semiconductor to provide a lift-off mask,(ii) forming, while the substrate is at a temperature less than the temperature corresponding to the vapor pressure of the material of the thin film semiconductor, a first layer film portion of the source and drain electrode film laminate on the resist film and on exposed portions of the thin film semiconductor and in ohmic contact with the thin film semiconductor, the first layer film portion having a mesh structure,(iii) forming a second layer film portion of the source and drain electrode film laminate on the first layer film portion and in contact with the thin film semiconductor through the mesh structure of the first layer film portion, the second layer film portion having a greater adhesion strength than the first layer film portion, reinforcing the first layer film portion and having a thickness sufficient to provide a continuous film across the step, and(iv) removing the lift-off mask from the first portion of the thin film semiconductor.