Patent ID: 7704835
Filing Date: 2010-04-27
Classification: B81C,H01L

Abstract:
1. A method of forming a selective spacer on a device comprising: forming a non-planar structure having a first sidewall and a second sidewall; forming a margin layer having a sidewall over and in alignment with the second sidewall to augment the second sidewall for a total height greater than that of the first sidewall, wherein the margin layer is formed to have a thickness greater than the height of the first sidewall; depositing a spacer film over the non-planar structure to cover the first sidewall and the second sidewall, wherein the spacer film is deposited to a thickness greater than the height of the first sidewall and less than the thickness of the second sidewall added to the thickness of the margin layer; removing a portion of the spacer film with a first unpatterned etch to form a first spacer on the first sidewall and a second spacer on the second sidewall; and removing the first spacer from the first sidewall with a second unpatterned etch without removing the second spacer from the second sidewall to form the selective spacer.