Patent ID: 11869756
Assignee: TOKYO ELECTRON LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A method of optimizing a recipe for a plasma process, comprising:
(a) building a virtual metrology (VM) model that predicts a wafer characteristic resulting from the plasma process based on a plasma parameter;
(b) building a control model that describes a relationship between the plasma parameter and a recipe parameter;
(c) measuring the wafer characteristic after performing the plasma process according to the recipe;
(d) determining whether the wafer characteristic is within a predetermined range;
(e) calibrating the VM model and the control model based on the wafer characteristic;
(f) optimizing the recipe by updating the plasma parameter based on the wafer characteristic using the VM model and updating the recipe parameter based on the plasma parameter using the control model; and
(g) repeating (c), (d), (e) and (f) until the wafer characteristic is within the predetermined range,
wherein calibrating the control model comprises:
performing the plasma process on a dummy wafer according to the recipe;
recording the plasma parameter while performing the plasma process on the dummy wafer according to the recipe; and
updating the control model based on the plasma parameter recorded.