Patent ID: 7098091
Filing Date: 2006-08-29
Classification: H01L

Abstract:
1. A method for forming a thin film field effect transistor comprising: forming a preliminary substrate having at least a glass substrate layer and a buffer layer; forming source and drain metal regions of the transistor in predetermined locations on the buffer layer, the source and drain metal regions defining an opening; forming a silicon layer, a gate oxide layer, and gate metal layer within the opening; forming a first photoresist pattern on the gate metal layer having a two-portion structure with a first portion and a second portion underneath the first portion; selectively removing portions of the gate metal, gate oxide, and silicon layers using the first photoresist pattern; selectively reducing the first photoresist pattern to form a second photoresist pattern with a coverage area smaller than that of the first photoresist pattern; reducing the gate metal layer using the second photoresist pattern; removing the second photoresist pattern; and doping a predetermined impurity in the silicon layer for forming a source region and a drain region of a predetermined type.