Track-Based Mandrel Patterning With Reversible Overcoat Solubility Control
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Solution Overview
Problem
Existing semiconductor manufacturing processes face challenges in achieving sub-lithographic patterning resolution due to the complexity and cost of spacer techniques, which require multiple costly steps such as over-coating, chemical-mechanical planarization, and reactive ion etching.
Innovation Solution
The use of a developer with a solubility distance in the range of zero to seven in the Hansen Solubility Parameter space relative to methyl isobutyl carbinol (MIBC) to selectively remove de-crosslinked regions of a reversible overcoat layer, allowing for the formation of mandrel patterns with sub-lithographic dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional spacer techniques are used for sub-lithographic patterning, then manufacturing precision is improved, but device complexity and manufacturing cost increase due to multiple required steps
Solution Approach 1:
The patent extracts and eliminates the complex intermediate steps (over-coating, CMP, reactive ion etching) from the conventional spacer technique, retaining only the essential crosslinking and development steps to achieve sub-lithographic patterning with simplified process flow
Solution Approach 2:
The patent changes the chemical parameters of the overcoat layer by using crosslinking reactions to alter solubility characteristics, enabling the layer to become insoluble in the developer and form precise mandrel patterns without requiring mechanical planarization or complex etching steps
2Manufacturing precision
If conventional spacer techniques are used for sub-lithographic patterning, then manufacturing precision is improved, but manufacturing cost increases due to multiple costly steps
Solution Approach 1:
The patent removes the costly intermediate processing steps (over-coating, chemical-mechanical planarization, reactive ion etching) from the conventional spacer technique, keeping only the crosslinking and development steps to achieve sub-lithographic patterning at reduced manufacturing cost
Solution Approach 2:
The patent uses a disposable reversible overcoat layer that is applied, crosslinked, and then selectively removed after forming the mandrel pattern, replacing expensive reusable equipment and complex processing with a single-use sacrificial layer approach
3Manufacturing precision
If a developer with solubility distance zero to seven relative to MIBC is used, then manufacturing precision is improved for sub-lithographic patterning, but the specificity of material selection increases
Solution Approach 1:
The patent changes the solubility parameters of the overcoat layer through crosslinking reactions, transforming it from a soluble state to an insoluble state that resists the developer, enabling precise mandrel formation with controlled solubility characteristics
Solution Approach 2:
The patent employs composite material design by combining the reversible overcoat layer with crosslinking agents to create a material system with tunable solubility properties, where the crosslinked network provides the necessary resistance to the developer while maintaining pattern fidelity
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
This approach enables the formation of mandrel patterns with sub-lithographic dimensions, overcoming the limitations of conventional spacer techniques by simplifying the process and reducing costs, while maintaining precise control over feature sizes.
Implementation Method 1
a developer with a solubility distance in the range of zero to seven in the Hansen Solubility Parameter space relative to methyl isobutyl carbinol (MIBC) to selectively remove de-crosslinked regions
Implementation Method 2
inducing a crosslinking reaction within the reversible overcoat layer that renders the reversible overcoat layer insoluble to a developer
Implementation Method 3
diffusing acid particles from the first mandrels into first portions of the crosslinked overcoat layer
Data Source
AI summary
A method for forming a semiconductor device can include coating a reversible overcoat layer over first mandrels on a substrate, inducing a crosslinking reaction within the reversible overcoat layer that renders the reversible overcoat layer insoluble to a developer and forms a crosslinked overcoat layer, diffusing acid particles from the first mandrels into first portions of the crosslinked overcoat layer, inducing a de-crosslinking reaction within the first portions of the crosslinked overcoat layer to form de-crosslinked regions, where unmodified regions of the crosslinked overcoat layer form second mandrels, and selectively removing the de-crosslinked regions with the developer such that the first mandrels and the second mandrels form a mandrel pattern over the substrate, where the developer has a solubility distance in a range of zero to seven in a Hansen Solubility Parameter space relative to methyl isobutyl carbinol.