Patent ID: 6586335
Filing Date: 2003-07-01
Classification: G02B,H01L

Abstract:
A method of manufacturing a thin film transistor comprising:a substrate, a gate electrode formed on said substrate; an insulating film formed on said gate electrode and said substrate except for whole of outer surface of said gate electrode, a semiconductor film formed on said insulating film, a source electrode connected to said semiconductor film, and a drain electrode connected to said semiconductor film, wherein at least one of said gate electrode, said source electrode, and said drain electrode, is composed of one material, and the method of manufacturing comprises the steps of: (a) changing an etching rate of said at least one electrode in a direction perpendicular to a top surface thereof by changing deposition conditions during a deposition step, and (b) etching said at least one electrode such that it is trapezoidal in its section; wherein said changing step includes either (i) changing a deposition pressure, (ii) changing a deposition power, (iii) changing a deposition temperature, (iv) changing a partial pressure of nitrogen gas relative to argon gas of a deposition gas stream, or (v) doping a deposition gas stream with phosphorous ions.