Dual tone development with plural photo-acid generators in lithographic applications
First Claim
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1. A method of patterning a substrate, comprising:
- forming a layer of radiation-sensitive material on a substrate, said layer of radiation-sensitive material comprises a first photo-acid generator and a second photo-acid generator;
performing a patterned exposure of said layer of radiation-sensitive material to electromagnetic (EM) radiation; and
performing a flood exposure of said layer of radiation-sensitive material to electromagnetic (EM) radiation,wherein said patterned exposure, or said flood exposure, or both said patterned exposure and said flood exposure contain a first wavelength or first range of wavelengths, and a second wavelength or second range of wavelengths,wherein said first photo-acid generator generates acid in said layer of radiation-sensitive material when exposed to said EM radiation at said first wavelength or first range of wavelengths, andwherein said second photo-acid generator generates acid in said layer of radiation-sensitive material when exposed to EM radiation at a second wavelength or second range of wavelengths.
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Abstract
A method and system for patterning a substrate using a dual tone development process is described. The method comprises use of plural photo-acid generators with or without a flood exposure of the substrate to improve process latitude for the dual tone development process.
48 Citations
13 Claims
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1. A method of patterning a substrate, comprising:
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forming a layer of radiation-sensitive material on a substrate, said layer of radiation-sensitive material comprises a first photo-acid generator and a second photo-acid generator; performing a patterned exposure of said layer of radiation-sensitive material to electromagnetic (EM) radiation; and performing a flood exposure of said layer of radiation-sensitive material to electromagnetic (EM) radiation, wherein said patterned exposure, or said flood exposure, or both said patterned exposure and said flood exposure contain a first wavelength or first range of wavelengths, and a second wavelength or second range of wavelengths, wherein said first photo-acid generator generates acid in said layer of radiation-sensitive material when exposed to said EM radiation at said first wavelength or first range of wavelengths, and wherein said second photo-acid generator generates acid in said layer of radiation-sensitive material when exposed to EM radiation at a second wavelength or second range of wavelengths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification