Patent ID: 8273615
Filing Date: 2012-09-25
Classification: H01L

Abstract:
1. A method of manufacturing a thin film transistor, comprising: forming a silicon layer on a substrate; forming a photoresist layer on a portion of the silicon layer; performing a first etch process of the photoresist layer and the silicon layer using first reaction gases, wherein the etch rate of the photoresist is greater than that of the silicon layer in the first etch process, and wherein a portion within a range of about 70% to about 90% of the silicon layer is removed through the first etch process; performing a second etch process of the photoresist layer and the silicon layer using second reaction gases different from the first reaction gases, wherein the etch rate of the silicon layer is greater than that of the photoresist in the second etch process, and wherein the first and second etch processes form an active layer having an island shape with tapered edge portions and exposing adjacent portions of the substrate; removing the remaining photoresist layer remaining after the first and second etch processes; forming a gate insulating layer on the active layer and the substrate; forming a gate electrode on the gate insulating layer over the active layer; and implanting impurities into the active layer to define source and drain regions and to define a channel region under the gate electrode.