Patent ID: 8003460
Filing Date: 2011-08-23
Classification: H01L

Abstract:
1. A method of forming a semiconductor structure, comprising: providing a semiconductor substrate comprising a first feature and a second feature; forming a layer of a first material and a layer of a second material over said first feature and said second feature; forming a first mask over said first feature; performing at least one first etch process in the presence of said first mask adapted to remove said layer of second material and portions of said layer of first material over said second feature to form at least one first sidewall spacer structure adjacent said second feature from a first remaining portion of said layer of first material, wherein said first sidewall spacer structure does not include a remaining portion of said layer of second material; performing a first ion implantation process in the presence of the first sidewall spacer structure, wherein said first mask remains over said first feature during said first ion implantation process; forming a second mask over said second feature; performing at least one second etch process in the presence of said second mask adapted to remove portions of said layer of first material over said first feature and to form at least one second sidewall spacer structure adjacent said first feature from a second remaining portion of said layer of first material and a first remaining portion of said layer of second material; and performing a second ion implantation process in the presence of the second sidewall spacer structure, wherein said second mask remains over said second feature during said second ion implantation process.