Polysiloxane Coating for High Aspect Ratio Pattern Planarization
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Solution Overview
Problem
Existing methods for forming patterns on substrates struggle with achieving flat coating on stepped substrates with height differences and isolated portions, particularly in semiconductor fabrication, where conventional polysiloxane compositions fail to fill patterns with high aspect ratios effectively.
Innovation Solution
A composition comprising a polysiloxane with a silanol group content of 20 mol % or less and a weight average molecular weight of 1,000 to 50,000, derived from a hydrolysate condensation product of hydrolyzable silane raw materials, is applied to the substrate, allowing for effective filling and planarization of organic patterns, including those with high aspect ratios, through a specific etching process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional polysiloxane compositions are used for coating stepped substrates, then the coating process is simple, but the coating flatness deteriorates due to inability to fill high aspect ratio patterns
Solution Approach 1:
The patent changes the molecular weight parameter of polysiloxane to 1,000-50,000 and controls silanol group content to 20 mol% or less, which fundamentally alters the coating behavior and enables effective filling of high aspect ratio patterns while achieving flat coating surfaces
Solution Approach 2:
The patent creates a composite polysiloxane system combining specific molecular weight ranges with controlled silanol group content, derived from hydrolysate condensation products of hydrolyzable silane raw materials, to achieve both pattern filling and coating flatness
2Strength
If polysiloxane with high silanol group content is used, then the reactivity is improved, but the coating flatness deteriorates due to excessive crosslinking
Solution Approach 1:
The patent precisely controls the silanol group content parameter to 20 mol% or less, which balances reactivity and crosslinking density to achieve both adequate coating film strength and excellent coating flatness without excessive crosslinking
3Manufacturing precision
If polysiloxane with low molecular weight is used, then the pattern filling capability is improved, but the coating film strength deteriorates
Solution Approach 1:
The patent optimizes the molecular weight parameter to a specific range of 1,000-50,000, which provides sufficient low molecular weight characteristics for effective pattern filling while maintaining adequate coating film strength through controlled crosslinking
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 enables complete planarization of stepped substrates, allowing for the formation of reverse patterns with high aspect ratios, improving the flatness of the coating film and facilitating pattern reversal processing.
Implementation Method 1
a technique for forming a pattern includes a pattern reversal method. A resist pattern is formed on a semiconductor substrate, and the resist pattern is coated with a silicon coating composition. Thus, the resist pattern is filled with the silicon coating composition
Implementation Method 2
a polysiloxane comprising a hydrolysate condensation product of a hydrolyzable silane raw material
Data Source
AI summary
A composition for flattening uneven substrates. The composition for flattening uneven substrates, which is applied on an organic pattern, includes a solvent and a polysiloxane including a hydrolysis condensate of a hydrolyzable silane, wherein the polysiloxane includes silanol groups in a proportion of 20 mol % or less with respect to Si atoms, and the weight-average molecular weight of the polysiloxane is 1,000-50,000.