Aryl Acetate Onium Acid Generators for EUV Photoresist Resolution
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Solution Overview
Problem
Current photoresists face challenges in achieving highly resolved images with submicron dimensions, particularly in EUV Lithography, where materials with low linewidth roughness and sufficient sensitivity are needed to enhance wafer throughput.
Innovation Solution
Development of new acid generators and photoresist compositions that include carbocyclic or heteroaromatic groups substituted with acetate moieties, specifically diester moieties and onium compounds like iodonium or sulfonium materials, which react during lithographic processing to improve imaging resolution and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional photoresist materials are used, then existing commercial applications can be met, but highly resolved images of submicron dimension cannot be achieved
Solution Approach 1:
The patent modifies the chemical structure of photoactive compounds by introducing specific substituents (e.g., fluorine atoms, aromatic groups) and varying molecular weights to optimize photoresist performance for submicron imaging applications
Solution Approach 2:
The patent develops composite photoresist formulations combining multiple polymers (e.g., polyhydroxystyrene, cycloaliphatic epoxy resin) with photoactive compounds and additives to achieve both high resolution and process reliability
2Manufacturing precision
If photoresist materials are optimized for high resolution, then submicron features can be formed, but sensitivity and wafer throughput are reduced
Solution Approach 1:
The patent optimizes the molecular weight and chemical composition of photoactive compounds to simultaneously improve resolution and sensitivity, allowing faster exposure times while maintaining submicron feature fidelity
Solution Approach 2:
The patent introduces functionally distinct components (e.g., glassy polymer matrix for resolution, flexible polymer for sensitivity) that perform specialized roles to balance resolution and throughput requirements
3Manufacturing precision
If photoresist composition is altered to improve functional properties, then imaging performance can be enhanced, but material complexity increases
Solution Approach 1:
The patent designs photoactive compounds that perform multiple functions simultaneously (e.g., photoacid generation, adhesion promotion, planarization) to reduce the number of separate additives needed in the photoresist formulation
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
These acid generators enhance the resolution and sensitivity of photoresists, enabling the formation of fine features with sub-50 nm or sub-20 nm dimensions, improving the performance of EUV imaging and wafer throughput.
Implementation Method 1
acid generators are provided that comprise a carbocyclic or heteroaromatic group substituted with at least one acetate moiety... react in the presence of acid during lithographic processing
Data Source
AI summary
Acid generators comprising a carbocyclic aryl or heteroaromatic group substituted with at least one acetate moiety are provided. These acid generators are particularly useful as a photoresist composition component.