Iodine-Containing Radiation-Sensitive Composition for EUV Lithography
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Solution Overview
Problem
Current radiation-sensitive compositions for microfabrication lack superior sensitivity, resolution, and Critical Dimension Uniformity (CDU) when exposed to extreme ultraviolet rays and electron beams.
Innovation Solution
A radiation-sensitive composition comprising a polymer with a specific structural unit and a compound having an anion and radiation-sensitive onium cation, both incorporating a ring structure with iodine atoms, which enhances acid generation efficiency and diffusion control in light-exposed regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional radiation-sensitive compositions are used, then the basic lithography function is achieved, but sensitivity, resolution, and CDU are insufficient
Solution Approach 1:
The patent employs a composite radiation-sensitive composition comprising a polymer base material and a halogen-containing compound. This composite approach combines the advantages of both components: the polymer provides the basic resist functionality while the halogen-containing compound enhances sensitivity and resolution through improved acid generation characteristics. The synergistic interaction between these materials achieves superior lithographic performance compared to conventional single-component systems.
Solution Approach 2:
The patent modifies key chemical parameters of the radiation-sensitive composition by introducing halogen atoms (particularly iodine) into the molecular structure. This parameter change affects the acid generation efficiency and diffusion characteristics, thereby improving resolution and CDU. The halogen substitution alters the photolability and reaction kinetics, enabling better control over the resist pattern formation process.
2Reliability
If conventional radiation-sensitive compositions are used, then the basic lithography function is achieved, but sensitivity, resolution, and CDU are insufficient
Solution Approach 1:
The composite system comprising polymer and halogen-containing compound works synergistically to simultaneously improve sensitivity and CDU. The halogen-containing compound enhances acid generation efficiency (improving sensitivity) while its molecular structure controls acid diffusion behavior (improving CDU), achieving both improvements concurrently rather than trading one for the other.
Solution Approach 2:
The patent creates local quality differentiation through the selective placement of halogen atoms in specific molecular positions. This local modification concentrates the acid generation effect at the exposure site while controlling diffusion to adjacent regions, thereby improving both sensitivity at the target location and CDU through precise spatial control of the chemical reaction.
3Reliability
If radiation-sensitive composition components are optimized for sensitivity, then sensitivity improves, but resolution and CDU may deteriorate
Solution Approach 1:
The patent optimizes the balance between sensitivity and resolution by precisely controlling the chemical parameters of the halogen-containing compound. Specifically, the type of halogen, its position in the molecule, and the accompanying functional groups are carefully selected to achieve the desired balance. This parameter optimization allows simultaneous improvement of sensitivity and resolution without the trade-off that plagues conventional single-parameter optimization approaches.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition achieves improved sensitivity, resolution, and CDU by optimizing acid generation and diffusion, leading to superior resist pattern formation.
Implementation Method 1
A radiation-sensitive composition for use in microfabrication by lithography generates an acid at light-exposed regions upon an irradiation with a radioactive ray, e.g., an electromagnetic wave such as a far ultraviolet ray such as an ArF excimer laser beam (wavelength of 193 nm), a KrF excimer laser beam (wavelength of 248 nm), etc. or an extreme ultraviolet ray (EUV) (wavelength of 13.5 nm), or a charged particle ray such as an electron beam.
Data Source
AI summary
A radiation-sensitive composition includes: a polymer comprising a first structural unit represented by formula (1); and a compound comprising an anion and a radiation-sensitive onium cation. At least one of the polymer and the compound has a ring structure having at least one iodine atom bonded to the ring structure. R1 represents a hydrogen atom, a fluorine atom, a methyl group, or a trifluoromethyl group; L1 represents a single bond, —COO—, or —CONH—; Ar1 represents a group obtained by removing two hydrogen atoms from a substituted or unsubstituted aromatic hydrocarbon ring; and R2 represents an acid-labile group.