Patent ID: 11915931
Assignee: TOKYO ELECTRON LIMITED
Field: Optics (Instruments)
Classification: CPC H  G | IPC H

Claim 15:
16. A method for patterning a substrate comprising:
preparing a plurality of test substrates, wherein each test substrates has a substantially same top layer;
forming a lithography stack over the top layer of each of the plurality of test substrates, the lithography stack comprising a base layer and a photoresist layer disposed over the base layer, wherein the base layer in each of the plurality of test substrates has a different combination of thickness and composition;
patterning each photoresist layer with an extreme ultraviolet (EUV) lithography process, by exposing the photoresist layer to a pattern of EUV radiation in a focus-exposure matrix;
obtaining patterning metrics by measuring the patterned photoresist layer of each of the plurality of test substrates; and
based on the patterning metrics, selecting a first type of base layer, the first type of base layer having a specific combination of a first thickness and a first composition for forming a first base layer of a lithography stack for an EUV lithography process.