Patent ID: 11940730
Assignee: ROHM AND HAAS ELECTRONIC MATERIALS LLC
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A pattern formation method, comprising:
(a) applying a layer of a photoresist composition over a substrate,
(b) pattern-wise exposing the photoresist composition layer to i-line radiation; and
(c) developing the exposed photoresist composition layer to provide a resist relief image; wherein the layer of the photoresist composition is coated in a single application by spin-coating to a thickness of 1 to 50 micrometers;
wherein the photoresist composition comprises:
a non-ionic photoacid generator;
a solvent;
a first polymer comprising first polymerized units of formula (1), second polymerized units of formula (2); and third polymerized units of formula (3):, wherein a is an integer from 1 to 5 and Z3 is a hydrogen, Z and R5 are independently selected from a hydrogen atom, C1-C4 alkyl, C1-C4 fluoroalkyl, or cyano; Zi is a non-hydrogen substituent comprising an acid-labile group, the cleavage of which forms a carboxylic acid on the polymer; L is a substituted or unsubstituted C1-C4 alkylene; Ar1 is a substituted or unsubstituted anthracene group; wherein the first polymer is present in the photoresist composition in an amount of from 0.1 to 10 wt %, based on total solids of the photoresist composition; and
a second polymer comprising first polymerized units of formula (4), , wherein b is an integer from 1 to 5 and Z4 is a hydrogen or an alkyl group having 1 to 5 carbon atoms; and second polymerized units of a monomer comprising an acid-labile group; and wherein the second polymer is free of polymerized units of formula (3): present in the photoresist composition in an amount of 10 to 99 wt %, based on total solids of the photoresist composition.