Polysiloxane Underlayer for Semiconductor Etching Selectivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current photoresist underlayer compositions for semiconductor manufacturing face challenges in achieving stable synthesis, high etching selectivity, and storage stability, particularly when using silicone resins with high silicon content, which can lead to defective coatings and reduced throughput in the semiconductor device fabrication process.
Innovation Solution
A photoresist underlayer composition incorporating a polysiloxane resin produced through controlled hydrolysis and condensation polymerization of specific silicon-containing compounds, along with a solvent and optional additives, which allows for precise control of the OH and OR groups' ratios and includes a high boiling point solvent to prevent voids and improve film flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone resin with high silicon content is used to improve etching selectivity, then etching resistance is improved, but storage stability deteriorates and defective coatings occur
Solution Approach 1:
The patent changes the chemical composition parameters of the silicone resin by controlling the molar ratios of specific silicon compounds (tetraethyl orthosilicate, phenyltrimethoxysilane, and others) to achieve optimal silicon content that provides sufficient etching selectivity while maintaining storage stability. The resin is formulated with specific OH and OR group ratios to prevent degradation during storage.
2Manufacturing precision
If polysiloxane resin is used to improve etching resistance, then manufacturing precision is improved, but synthesis stability deteriorates
Solution Approach 1:
The patent creates a composite polysiloxane resin system combining multiple silicon-containing compounds (tetraethyl orthosilicate, phenyltrimethoxysilane, vinyltrimethoxysilane, and others) with specific functional groups. This composite approach provides synergistic effects that enhance etching resistance while the balanced composition ensures stable synthesis and prevents gelation or precipitation during manufacturing.
3Manufacturing precision
If photoresist layer is made thinner to improve resolution, then manufacturing precision is improved, but etching selectivity deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the underlayer material to compensate for the reduced photoresist thickness. By optimizing the silicon content, OH/OR group ratio, and composition of the polysiloxane resin, the underlayer provides enhanced etching selectivity that enables thin photoresist layers to maintain sufficient etching protection while achieving high resolution patterning.
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 improved storage stability, etching resistance, and anti-reflection characteristics, enabling the use of a thinner photoresist layer while maintaining high etching selectivity and reducing defects in the semiconductor device fabrication process.
Implementation Method 1
the polysiloxane resin may be a condensation polymerization product of compounds represented by Chemical Formulae 2 to 4: [HO]a[R2O](3-a)Si—X [Chemical Formula 2]
Implementation Method 2
the polysiloxane resin may be a condensation polymerization product of compounds represented by Chemical Formulae 2 to 4
Implementation Method 3
includes a high boiling point solvent to prevent voids and improve film flatness
Data Source
AI summary
A photoresist underlayer composition includes a solvent, and a polysiloxane resin represented by Chemical Formula 1:{(SiO1.5—Y—SiO1.5)x(SiO2)y(XSiO1.5)z}(OH)e(OR1)f. [Chemical Formula 1]