Siloxane Composition for High-Temperature Resistant Patterns
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Solution Overview
Problem
Current positive-type photosensitive siloxane compositions face challenges in forming high-resolution, heat-resistant, and chemically resistant patterns with reduced defects due to development residues and undissolved remains, particularly in high-temperature processes for applications like thin film transistors and organic EL displays.
Innovation Solution
A composition comprising at least two polysiloxanes with different dissolution rates in tetramethylammonium hydroxide aqueous solutions, a polysiloxane with a group soluble in TMAH other than silanol, and a diazonaphthoquinone derivative, which reduces pattern defects and enhances heat and chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If acrylic resin and quinonediazide compound are used as planarization film materials, then the material can be processed at high temperature (200°C or more), but decomposition begins at 230°C or more causing film thickness reduction and transparency loss
Solution Approach 1:
The patent changes the chemical composition parameters of the photosensitive material from acrylic resin-based to siloxane-based composition, which fundamentally alters the thermal stability characteristics. The siloxane backbone structure provides inherent high-temperature resistance without decomposition, maintaining film integrity and transparency at temperatures where acrylic materials fail.
Solution Approach 2:
The patent employs a composite photosensitive composition containing siloxane resin, diazonaphthoquinone derivative, and specific solvent system. This composite formulation combines the thermal stability of siloxane with the photosensitivity of diazonaphthoquinone, creating a material that simultaneously achieves high-temperature resistance and pattern-forming capability without the decomposition issues of acrylic-based composites.
2Temperature
If polysiloxane is used to achieve high thermal resistance and transparency, then heat resistance improves, but the material requires specific solubility properties for developer compatibility
Solution Approach 1:
The patent modifies the polysiloxane structure by controlling the R1 and R2 groups and the n value in the silane compound formula, which directly affects both thermal resistance and developer solubility. By optimizing these molecular parameters, the material achieves the dual requirement of high-temperature stability and appropriate dissolution characteristics in TMAH developer for positive-tone patterning.
Solution Approach 2:
The patent introduces functional groups with different solubility characteristics at specific positions in the siloxane structure. The R1 group (alkyl or aryl) and R2 group (alkyl) provide localized chemical properties that control developer interaction, while the siloxane backbone maintains overall thermal stability. This local functional differentiation enables simultaneous achievement of heat resistance and developer compatibility.
3Temperature
If high dielectric constant material is used to provide heat resistance, then thermal stability improves, but parasitic capacitance increases causing larger electricity consumption and signal delay
Solution Approach 1:
The patent creates a composite siloxane-based photosensitive composition that forms an insulating film with inherently low dielectric constant due to the siloxane molecular structure. The Si-O-Si backbone and organic side groups create a material that naturally exhibits low polarity and low dielectric properties, eliminating the need to choose between heat resistance and low capacitance that plagues conventional high-k materials.
Solution Approach 2:
The patent changes the fundamental dielectric parameter of the insulating material by using siloxane chemistry instead of traditional acrylic or high-k materials. The molecular structure of siloxane with its electronegative oxygen atoms arranged in a specific geometry provides both thermal stability and low dielectric constant, simultaneously resolving the contradiction between heat resistance and electrical performance.
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 achieves high sensitivity and resolution with reduced pattern defects, excellent heat resistance, and improved chemical resistance, making it suitable for various applications including thin film transistors and organic EL displays.
Implementation Method 1
a diazonaphthoquinone derivative which has a property of being insoluble in a developer before light irradiation and having a property of being soluble in the developer after light irradiation
Implementation Method 2
at least two polysiloxanes which have different rates of dissolution in tetramethylammonium hydroxide aqueous solutions
Data Source
AI summary
A positive-type photosensitive siloxane composition which comprises (I) two or more polysiloxanes that differ in the rate of dissolution in aqueous tetramethylammonium hydroxide (TMAH) solutions, (II) a polysiloxane that gives a film which after prebaking has a rate of dissolution in 2.38 wt-% aqueous TMAH solution of 50-1,000 Å/sec and that has a group soluble in aqueous TMAH solution, other than silanol, (III) a diazonaphthoquinone derivative, and (IV) a solvent.