Coumarinyl Oxime Derivatives for Photoresist Sensitivity
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Solution Overview
Problem
Current photoresist compositions for display applications, such as LCD and OLED devices, face challenges in achieving high sensitivity and transparency due to limitations in photosensitivity and transmittance, particularly in the radiation-sensitive resin compositions used for forming insulation layers, color filters, and microlenses.
Innovation Solution
Incorporating oxime derivatives with a coumarinyl chromophore containing a strong electron-withdrawing group, such as a perfluoroalkyl or perfluoroaryl group, to enhance photo sensitivity and transparency, specifically in the form of compounds like those described in formula (I), which act as latent acids in chemically amplified photoresist compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photoresist compositions are used, then manufacturing process is simple, but photo sensitivity and transparency are insufficient
Solution Approach 1:
The patent modifies the molecular structure of photoacid generator compounds by introducing specific substituents (perfluoroalkyl groups at positions 3 and 5, coumarinyl chromophore) to change the chemical parameters of the photoresist composition. This structural modification enhances photo sensitivity and transparency without fundamentally changing the composition architecture
Solution Approach 2:
The invention creates a composite photoacid generator molecule combining multiple functional groups: coumarinyl chromophore for light absorption, oxime sulfonate for photoacid generation, and perfluoroalkyl groups for enhanced properties. This composite structure achieves superior photo sensitivity and transparency compared to conventional single-function compounds
2Productivity
If radiation-sensitive resin composition is used for forming insulation layers, then patterning efficiency is improved, but transmittance is reduced
Solution Approach 1:
The patent optimizes the molecular parameters of the photoacid generator to achieve high photo sensitivity at low concentrations (0.1-10 wt%), thereby maintaining high transmittance while ensuring sufficient patterning efficiency. The specific molecular structure enables effective photoacid generation with minimal absorption of exposure light
3Manufacturing precision
If photoresist composition with high sensitivity is used, then resolution is improved, but transparency is reduced
Solution Approach 1:
The invention fine-tunes the molecular parameters of the photoacid generator compound, specifically the substitution pattern on the coumarinyl ring and the nature of electron-withdrawing groups, to achieve optimal balance between photo sensitivity (affecting resolution) and light absorption characteristics (affecting transparency). The patent identifies specific structural parameters that maximize resolution while minimizing light absorption
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 introduction of these oxime derivatives significantly increases photo sensitivity and transparency, enabling the development of chemically amplified photoresist compositions with improved resolution and image quality, suitable for high-resolution patterns in display devices.
Implementation Method 1
photo exposure to the photoresist are known for the application as photo acid generator
Implementation Method 2
Incorporating oxime derivatives with a coumarinyl chromophore containing a strong electron-withdrawing group
Data Source
AI summary
Compounds of the formula (I) and (IA) wherein X is -O(CO)-; R1 is C1-C12haloalkyl or C6-C10haloaryl; R2 is located in position 7 of the coumarinyl ring and is OR8; R2a, R2b and R2C independently of each other are hydrogen; R3 is C1-C8haloalkyl or C1-C8haloalkyl; R4 is hydrogen; and R8 is C1-C6alkyI; are suitable as photosensitive acid donors in the preparation of photoresist compositions such as used for example in the preparation of spacers, insulating layers, interlayer dielectric films, insulation layers, planarization layers, protecting layers, overcoat layers, banks for electroluminescence displays and liquid crystal displays (LCD).