Photosensitive Resin Composition for Sub-2μm Pattern Formation
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Solution Overview
Problem
Existing photosensitive resin compositions struggle to finely pattern thin films in display devices, such as LCDs, due to limitations in solubility differences between exposed and unexposed regions, leading to difficulties in forming patterns with widths of 2 μm or less, which affects the transmittance and quality of display devices.
Innovation Solution
A photosensitive resin composition incorporating an alkali soluble base resin, a photoacid generator, a photoactive compound, and a phenol-based compound with a hydrophobic group, which reduces solubility in developing solutions, allowing for the formation of patterns with a rectangular cross-section and finer thin film patterns by controlling the molecular weight distribution and adding a phenol-based compound to enhance solubility differences between exposure and non-exposure portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional photosensitive resin compositions are used, then the patterning process is simple, but the manufacturing precision deteriorates because patterns with widths of 2 μm or less cannot be formed
Solution Approach 1:
The patent uses a composite resin composition comprising multiple components: a base resin (polyester or polyacrylic acid), a photoacid generator, a photoactive compound, and a phenol-based compound with hydrophobic group. This composite formulation creates synergistic effects where each component contributes specific properties - the base resin provides structural framework, the photoacid generator enables photolithography, the photoactive compound enhances sensitivity, and the phenol-based compound controls solubility characteristics, collectively achieving sub-2μm patterning precision
Solution Approach 2:
The patent systematically optimizes multiple parameters including the molecular weight of the base resin (500-5000 g/mol), the concentration ratios of different components (base resin: 100 parts, photoacid generator: 0.01-20 parts, photoactive compound: 0.1-30 parts, phenol-based compound: 0.01-20 parts), and the chemical structure of the phenol-based compound (Formula 1 with varying R1-R3 groups and n1-n3 values). These parameter optimizations enable precise control over solubility differences between exposed and unexposed regions, achieving manufacturing precision of 2 μm or less
2Manufacturing precision
If the solubility difference between exposed and unexposed regions is increased to improve patterning precision, then the manufacturing precision improves, but the ease of manufacture deteriorates due to difficulty in controlling solubility
Solution Approach 1:
The patent introduces a phenol-based compound with hydrophobic group (Formula 1) that selectively modifies the local solubility properties of the resin composition. This compound creates a distinct solubility difference between exposed and unexposed regions by interacting differently with the base resin matrix under photochemical conditions. The hydrophobic group (C1-C10 alkyl chain with n1-n3 repetitions) provides localized hydrophobicity that enhances solubility discrimination, enabling precise patterning while maintaining manufacturability through a well-defined chemical structure
Solution Approach 2:
The phenol-based compound acts as an intermediary substance that mediates between the base resin and the developing solution. It modifies the interaction between the resin matrix and the developing agent, creating a controlled solubility transition. The compound's dual nature (phenolic group for resin interaction, hydrophobic group for solubility modulation) allows it to serve as a mediator that enhances solubility differences without requiring extreme chemical conditions, thus maintaining ease of manufacture
3Manufacturing precision
If the molecular weight of the base resin is optimized to improve pattern formation, then the manufacturing precision improves, but the ease of manufacture deteriorates due to complex molecular weight distribution control
Solution Approach 1:
The patent specifies a controlled molecular weight range for the base resin (500-5000 g/mol) and provides optimal ranges for all composition parameters. This parameter optimization creates a balanced formulation where the base resin has sufficient molecular weight to maintain structural integrity and define pattern shapes (rectangular cross-sections), while remaining within a manufacturable range that avoids excessive complexity in synthesis and quality control
4Manufacturing precision
If the phenol-based compound with hydrophobic group is added to reduce solubility, then the manufacturing precision improves for forming rectangular cross-section patterns, but the ease of manufacture worsens due to additional component control requirements
Solution Approach 1:
The patent formulates a composite resin composition where the phenol-based compound (Formula 1) works synergistically with the base resin, photoacid generator, and photoactive compound. The phenol-based compound provides hydrophobic character that enhances the formation of rectangular cross-section patterns by controlling solubility during development. The composite formulation integrates multiple functions into a single system, achieving precise pattern formation while managing formulation complexity through defined component roles and optimal ratios
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 enables the formation of thin film patterns with widths of 2 μm or less, improving the transmittance and quality of display devices by maintaining a rectangular cross-section shape even at small widths, thus enhancing the patterning precision and efficiency.
Implementation Method 1
a photoacid generator, a photoactive compound
Implementation Method 2
a phenol-based compound including a hydrophobic group
Implementation Method 3
solubility differences between exposed and unexposed regions
Data Source
AI summary
A method for forming a pattern includes forming a photosensitive film by coating a photosensitive resin composition on a substrate, exposing the photosensitive film to light through a mask that includes a light transmission region and a non-light transmission region, coating a developing solution on the photosensitive film, and forming a photosensitive film pattern by baking the photosensitive film, wherein the photosensitive resin composition includes an alkali soluble base resin, a photoacid generator and a photoactive compound.