Patent ID: 7341915
Filing Date: 2008-03-11
Classification: H01L

Abstract:
1. A method for forming a semiconductor device from a substrate comprising a bottom gate layer, a channel layer overlying the bottom gate layer, and a top gate structure formed over the channel layer, the method comprising: depositing a hardmask comprising a first material interposed between a second material and a third material over a portion of the top gate structure; encapsulating the hardmask and the top gate structure with an insulating material to form a spacer, said encapsulating comprising placing insulating material over the top gate structure, incorporating the insulating material with the first material of the hardmask, and depositing a passivating layer on an exposed portion of the top gate structure before placing the insulating material over the top gate structure; forming a channel structure from the channel layer, the channel structure disposed under the spacer; forming a bottom gate structure from the bottom gate layer, the bottom gate structure disposed under the channel structure; and forming a source/drain contact around the bottom gate structure.