Silica Layer Formation via Polymer Branching Control
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Solution Overview
Problem
Existing silica layer formation technologies face challenges in achieving a dense structure that balances etch resistance, planarization, and reduces shrinkage and stress, while maintaining gap-fill characteristics.
Innovation Solution
A composition comprising a silicon-containing polymer with a weight average molecular weight of 2,000 to 100,000 and a branching ratio of 0.25 to 0.50, combined with a solvent and optional thermal acid generator and surfactant, is used to form a silica layer through coating, drying, and curing at temperatures between 250°C to 1,000°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional silica layer formation methods are used, then the silica layer can be formed, but the layer structure is not dense enough, resulting in poor etch resistance and planarization
Solution Approach 1:
The patent changes the molecular weight parameter of the silicon-containing polymer to a specific range (2,000 to 100,000) and controls the branching ratio (a) to be 0.25 to 0.50, as defined by the Mark-Houwink equation η=k·Ma. These parameter changes result in a dense silica layer structure with improved etch resistance and planarization characteristics.
Solution Approach 2:
The patent uses a composite composition containing silicon-containing polymer and organic solvent, where the polymer provides the structural framework for dense silica formation. The combination of specific polymer components creates a composite material system that achieves both density and etch resistance.
2Reliability
If the silica layer is made denser to improve etch resistance, then etch resistance improves, but shrinkage and stress increase
Solution Approach 1:
The patent optimizes the molecular weight (2,000 to 100,000) and branching ratio (0.25 to 0.50) of the silicon-containing polymer to achieve a balance where the silica layer becomes dense enough for good etch resistance while controlling the cross-linking density to minimize shrinkage and internal stress.
3Manufacturing precision
If the silica layer is made denser to improve planarization, then planarization improves, but gap-fill characteristics worsen
Solution Approach 1:
The patent carefully selects the molecular weight range (2,000 to 100,000) and branching ratio (0.25 to 0.50) of the silicon-containing polymer to achieve a balance where the silica layer becomes dense enough for good etch resistance while controlling the cross-linking density to minimize shrinkage and internal stress.
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 results in a dense silica layer with improved etch resistance, reduced shrinkage and stress, and enhanced gap-fill characteristics, ensuring high-quality layer formation.
Implementation Method 1
curing the composition for forming a silica layer at about 250° C. to about 1,000° C.
Implementation Method 2
drying the substrate coated with the composition for forming a silica layer
Data Source
AI summary
A composition for forming silica layer includes a silicon-containing polymer and a solvent, wherein a weight average molecular weight of the silicon-containing polymer ranges from about 2,000 to about 100,000 and a branching ratio (a) of the silicon-containing polymer calculated by Equation 1 ranges from about 0.25 to about 0.50.η=k·Ma [Equation 1]In Equation 1,η is an intrinsic viscosity of a silicon-containing polymer,M is an absolute molecular weight of a silicon-containing polymer,a is a branching ratio, andk is an intrinsic constant.