Patent ID: 6746904
Filing Date: 2004-06-08
Classification: H01L,Y10S

Abstract:
A method of manufacturing an electronic device including a thin film transistor, comprising the steps of:(a) forming a gate structure including forming a gate electrode on an insulating surface; (b) depositing an insulating layer over the gate electrode and a region adjacent an edge of the gate electrode, such that the insulating layer comprises two first outer surfaces which are substantially parallel to, and mutually spaced normally of, the insulating surface with a step extending therebetween, said step forming a second outer surface forming an angle relative to said first two outer surfaces; (c) depositing a layer of semiconductor material on said first and second outer surfaces; (d) depositing a layer of electrode material on said first and second outer surfaces; (e) depositing a layer of negative resist material over the electrode material layer formed in step (e), the resist material being soluble in a predetermined solvent; (f) irradiating the resist layer using a beam at a predetermined angle, the surface of the resist overlying said two first outer surfaces being exposed more by said beam than the surface of the resist overlying the second outer surface due to said angle formed by said two first outer surfaces relative to said second outer surface, to render more exposed portions insoluble in the predetermined solvent, the portion overlying the step being insufficiently exposed such that it remains soluble, without the use of a mask to selectively block radiation from said reaching said portion overlying the step; (g) developing the resist layer using the predetermined solvent, thereby removing the portion overlying the step; and (h) removing the portion of the electrode material layer exposed by step (g) to define source and drain electrodes which extend over a respective one of the outer surfaces of the insulating layer to the step.