Patent ID: 7163868
Filing Date: 2007-01-16
Classification: H01L

Abstract:
1. A method for forming a lightly doped drain, said method comprising the following steps of: providing a substrate; forming an active layer over said substrate; forming an insulating layer over said active layer; forming a metal layer over said insulating layer; forming a patterned photoresist layer over said metal layer; performing an isotropic etching in said metal layer to form a gate electrode structure with inclined planes using said patterned photoresist layer as a mask; removing said patterned photoresist layer; performing an ion implantation into said active layer to form a source/drain electrode structure and lightly doped drains using said patterned gate electrode structure as a mask, wherein said lightly doped drains are located under the inclined planes of said gate electrode structure; forming a passivation layer over said insulating layer, said active layer and said gate electrode structure, wherein a plurality of contact holes are located in said passivation layer to expose the top surface of said source/drain electrode structure; and locating a transparent electrode layer over said passivation layer and contacting with said source/drain electrode structure through said contact holes.