Patent ID: 6391693
Filing Date: 2002-05-21
Classification: H01L

Abstract:
A method for making a polysilicon thin film transistor, comprising the steps of:forming a plurality of gate electrodes on a substrate; forming a gate insulating layer on the substrate so as to cover the gate electrodes; forming a channel layer by depositing an amorphous silicon layer on the gate insulating layer and by patterning the amorphous silicon layer, the channel layer covering the gate electrodes; forming ion stopper on selected portions of the channel layer corresponding to the gate electrodes; implanting impurities into portions of the channel layer located on opposing sides of the ion stoppers so as to form a plurality of impurity regions in the channel layer, the plurality of impurity regions having outermost regions at ends thereof and an intermediate region between an adjacent pair of the gate electrodes; transforming the channel layer into a polysilicon layer; and forming source and drain electrodes, each of which is in contact with a corresponding one of the outermost regions, wherein the outermost regions are source and drain regions, and the intermediate region is an auxiliary junction region for compensating an ON current.