Copolymer Resist Segmentation for Acid Diffusion Control
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Solution Overview
Problem
Current resist materials used in semiconductor lithography face challenges with acid diffusion during post-exposure baking, leading to low imaging contrast and degraded quality, especially when trying to transfer narrow trench patterns and via holes.
Innovation Solution
A copolymer resist material is developed, comprising hydrophobic, hydrophilic, and connection units that self-assemble into specific morphologies upon exposure, allowing localized acid generation and diffusion, thereby enhancing imaging contrast and quality by confining acid reactions to exposed areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional resist materials are used with post-exposure baking, then acid amplification is enhanced, but acid diffusion occurs leading to low imaging contrast
Solution Approach 1:
The patent segments the resist material into distinct functional blocks: hydrophobic blocks that resist acid diffusion and hydrophilic blocks that facilitate acid generation and reaction. This segmentation creates physical barriers within the polymer structure that confine acid to exposed areas while maintaining amplification efficiency.
Solution Approach 2:
The patent applies local quality by creating regions with different chemical properties within the resist material. Hydrophobic regions provide acid diffusion resistance in areas where pattern definition is critical, while hydrophilic regions enable efficient acid generation and reaction in exposed areas, optimizing both contrast and amplification locally.
2Manufacturing precision
If post-exposure baking is applied to enhance acid reaction, then polarity transformation is improved, but acid diffusion to unexposed areas increases
Solution Approach 1:
The hydrophobic blocks act as intermediary structures that mediate between the acid generation process and the surrounding environment. These blocks serve as physical barriers that allow acid to perform its function in exposed areas while preventing harmful diffusion to unexposed areas, effectively decoupling the beneficial reaction from the harmful side effect.
Solution Approach 2:
The patent changes the chemical parameter composition of the resist material by incorporating blocks with different hydrophobicity levels. This parameter change creates variations in acid diffusion resistance throughout the material, allowing controlled acid behavior during post-exposure baking without compromising polarity transformation.
3Adaptability or versatility
If current lithography techniques are used, then existing process compatibility is maintained, but narrow trench and via hole pattern transfer is difficult
Solution Approach 1:
The patent employs composite material design by combining hydrophobic and hydrophilic polymer blocks into a single resist material system. This composite structure provides both the chemical reactivity needed for acid-based lithography processes and the physical barrier properties required for high-resolution pattern transfer, achieving enhanced performance while maintaining process compatibility.
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 solution effectively improves imaging contrast and quality by confining acid reactions to exposed areas, enabling sharper transitions and better pattern transfer, particularly for narrow features like metal lines and via holes.
Implementation Method 1
comprising hydrophobic, hydrophilic, and connection units that self-assemble into specific morphologies upon exposure
Implementation Method 2
The copolymer comprises a hydrophobic unit, a hydrophilic unit
Implementation Method 3
irradiated by UV light through a photomask, generating proton acid in the exposed areas
Implementation Method 4
a post exposure baking process is applied to the substrates for enhancing the acid amplification and the acid reaction
Implementation Method 5
Post exposure baking is performed on the substrates
Data Source
AI summary
The present disclosure provides a sensitive material. The sensitive material comprises a copolymer that includes polymer units including a hydrophobic unit; a hydrophilic unit comprising an acid generator; and a connection unit bonded between the hydrophobic unit and the hydrophilic unit, the connection unit comprising an acid-labile group.