Patent ID: 9379017
Filing Date: 2016-06-28
CPC Classification: H01L

Claim Text:
1. A method, comprising: providing a semiconductor structure comprising a substrate comprising a material to be patterned; forming a first mandrel and a second mandrel over said substrate, the formation of said first mandrel and said second mandrel comprising a common photolithography process defining a position of said first mandrel relative to said substrate and a position of said second mandrel relative to said substrate; forming a first sidewall spacer adjacent said first mandrel and a second sidewall spacer adjacent said second mandrel; after the formation of said first and the second sidewall spacers, forming a block mask over said semiconductor structure, wherein said second mandrel is covered by said block mask and said first mandrel is not covered by said block mask and wherein forming said block mask comprises: with said block mask in position, removing said first mandrel, while leaving said second mandrel remaining in maid semiconductor structure; and providing a first mask element on the basis of said first sidewall spacer and a second mask element on the basis of said second mandrel and said second sidewall spacer and pattering said material to be patterned on the basis of said first and said second mask element, wherein a fin is formed front portions of said material to be patterned below said first mask element and an alignment/overlay mark is formed from portions of said material to be patterned below said second mask element.