Patent ID: 9711624
Date: 2017-07-18
CPC Classifications: G03F,H01L

Claim:
1. A method comprising: forming mandrels, in test sites on a substrate, parallel to each other and spaced from each other; performing first and second side wall transfer (SIT) processes, forming first through fourth fins in the substrate for each mandrel; designating spaces between first and second and between third and fourth fins as β, between first and fourth fins corresponding to adjacent mandrels as α, and between second and third fins as γ in each test site; applying a first selective lithomask over fins at a first test site selecting first spaces designated as a first one of α, β, or γ and the adjacent fins; applying a second selective lithomask over fins at a second test site selecting second spaces, designated as a second one of α, β, or γ, different from the first one, and the adjacent fins; measuring the first and second spaces selected with the selective first and second lithomasks; determining differences between the measured first spaces and second spaces; and adjusting processes for forming the first through fourth fins based on the determined differences.