Photoresist Composition for High Resolution and Sensitivity
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Solution Overview
Problem
Current photoresist compositions for OLED panels face challenges in achieving high resolution and sensitivity simultaneously, with existing solutions either offering low resolution or low sensitivity, which is insufficient for modern display panel requirements.
Innovation Solution
A photoresist composition comprising 1 wt % to 10 wt % of a photosensitizer, 10 wt % to 20 wt % of a phenolic resin, 0.1 wt % to 5.5 wt % of an additive, and 75 wt % to 88 wt % of a solvent, where the photosensitizer includes a combination of three specific photosensitive compounds, a surfactant, and an adhesion promoter, optimized for exposure to a mixed light source of H line, I line, and G line, enhancing both resolution and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If G line photoresist is used for high sensitivity, then sensitivity is improved, but resolution deteriorates
Solution Approach 1:
The patent uses a composite photosensitizer system comprising three different photosensitive compounds (diazonaphthoquinone, sulfonated diazonaphthoquinone, and carbazole derivatives) instead of a single compound. This composite approach allows the photoresist to respond to multiple wavelengths (H line 405nm, I line 365nm, and G line 436nm), achieving both high sensitivity and high resolution simultaneously by combining the advantages of different photosensitive materials
Solution Approach 2:
The patent optimizes the molecular weight of the phenolic resin to specifically 4000-8000 and controls the weight percentages of each photosensitive compound within specific ranges (first: 20-70%, second: 20-70%, third: 1-35%). These parameter optimizations ensure the photoresist layer has appropriate viscosity, solubility, and photochemical reactivity, enabling both high sensitivity and high resolution performance
2Manufacturing precision
If I line photoresist is used for high resolution, then resolution is improved, but sensitivity deteriorates
Solution Approach 1:
The patent employs a composite photosensitizer system with three types of photosensitive compounds that have different spectral responses. The inclusion of carbazole derivatives (third photosensitive compound) specifically enhances response to H line (405nm) and I line (365nm), while the diazonaphthoquinone compounds provide G line (436nm) sensitivity. This composite system achieves both high resolution and high sensitivity by leveraging the complementary properties of different photosensitive materials
Solution Approach 2:
The photoresist composition is designed to be universally responsive to multiple light sources (H line, I line, and G line) through the multi-component photosensitizer system. This multi-functionality allows the same photoresist formulation to achieve both high resolution (from I line exposure) and high sensitivity (from G line exposure), eliminating the need to choose between the two performance characteristics
3Manufacturing precision
If photoresist composition is optimized for high resolution, then resolution is improved, but productivity deteriorates
Solution Approach 1:
The patent optimizes the molecular weight of phenolic resin to 4000-8000 and controls the content of each photosensitive compound within specific ranges. These parameter optimizations ensure the photoresist has appropriate solubility and photochemical reactivity, achieving both high resolution and high sensitivity. The balanced composition allows the photoresist to process at reasonable speeds while maintaining fine pattern definition
Solution Approach 2:
The composite photosensitizer system with three different compounds provides broad spectral response and enhanced photochemical efficiency. This composite approach ensures high sensitivity (enabling faster processing) while maintaining high resolution, thus improving productivity without sacrificing manufacturing precision
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 a resolution of less than 2.5 μm, with a minimum resolution of 1.5 μm, while maintaining high sensitivity, thereby improving the accuracy and efficiency of patterning in OLED display panel production.
Implementation Method 1
exposing the photoresist to light through a mask
Implementation Method 2
the solubility of the photoresist in the alkaline solution will change after exposure, the solubility of the exposed part will increase
Data Source
AI summary
The present disclosure relates to a photoresist composition, a method for preparing the same, and a patterning method. The photoresist composition includes: 1 wt % to 10 wt % of a photosensitizer; 10 wt % to 20 wt % of a phenolic resin; 0.1 wt % to 5.5 wt % of an additive; and 75 wt % to 88 wt % of a solvent, based on the total weight of the photoresist composition, in which the photosensitizer includes: 20 wt % to 70 wt % of a first photosensitive compound represented by formula (1), 20 wt % to 70 wt % of a second photosensitive compound represented by formula (2), and 1 wt % to 35 wt % of a third photosensitive compound represented by formula (3), based on the total weight of the photosensitizer. The photoresist composition of the present disclosure simultaneously guarantees high resolution and high sensitivity, and can meet actual production requirements.