Patent ID: 8940558
Filing Date: 2015-01-27
Classification: G01B,H01L

Abstract:
1. A method for analyzing fin thickness variation (ΔDfin) between a pair of long channel FIN field-effect transistor (FINFET) devices, the method comprising the steps of: (a) obtaining threshold voltage (Vth) values for each of the long channel FINFET devices in the pair; (b) determining a difference in the Vth values (ΔVth) for the pair of long channel FINFET devices; (c) using the ΔVth to determine the ΔDfin between the pair of long channel FINFET devices, wherein the ΔVth is a function of a difference in a body charge (Qbody) and a gate capacitance between the pair of long channel FINFET devices, and wherein the Qbody is a function of fin thickness (Dfin) and channel doping concentration (Nch) for each of the long channel FINFET devices in the pair, and as such the ΔVth is proportional to the ΔDfin between the pair of long channel FINFET devices; and (d) based on the ΔDfin determined in step (c), repeating steps (a)-(c) while adjusting one or more process parameters to decrease the ΔDfin.