Patterned Mask Overcoat Solubility Control by Catalyst Diffusion
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Solution Overview
Problem
Existing photolithography methods struggle to achieve precise control over pattern formation in semiconductor manufacturing without requiring additional dissolution-inhibiting steps, which can complicate the process and reduce efficiency.
Innovation Solution
A method involving a relief pattern with a solubility-shifting agent and an overcoat material with different solubility thresholds, where a catalyst generated from the agent diffuses into the overcoat to create soluble regions, allowing selective removal of the overcoat while preserving the relief pattern, thus enhancing control over pattern dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional photolithography methods are used, then the basic patterning function is achieved, but additional dissolution-inhibiting steps are required which complicate the process and reduce efficiency
Solution Approach 1:
The patent extracts and removes the dissolution-inhibiting step from the conventional photolithography process by designing a relief pattern material that inherently maintains solubility contrast without requiring additional inhibition steps, thereby simplifying the overall process while maintaining patterning efficiency
Solution Approach 2:
The relief pattern material is designed to perform multiple functions simultaneously: it provides the relief pattern structure, maintains solubility contrast for selective removal, and eliminates the need for separate dissolution-inhibiting steps, reducing process complexity while improving productivity
2Manufacturing precision
If additional dissolution-inhibiting steps are used, then pattern formation control is improved, but the process becomes more complex and less efficient
Solution Approach 1:
The relief pattern material is designed to self-regulate solubility contrast through its inherent chemical composition and catalytic properties, eliminating the need for external dissolution-inhibiting steps while maintaining precise pattern formation control
3Manufacturing precision
If catalyst diffusion distance is increased, then soluble region formation in overcoat is improved, but relief pattern solubility may be affected
Solution Approach 1:
The patent applies local quality by creating spatially differentiated solubility properties: the relief pattern maintains insolubility in its core region while allowing controlled catalyst diffusion to create soluble regions only in the overcoat layer, achieving precise soluble region formation without compromising relief pattern stability
Solution Approach 2:
The patent controls the diffusion process by adjusting parameters such as catalyst concentration, diffusion time, and temperature to achieve the desired diffusion distance into the overcoat while maintaining the relief pattern's solubility stability through material composition design
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 improves pattern formation control by eliminating the need for additional dissolution-inhibiting steps, enabling precise pattern dimensions and flexibility in material selection and processing conditions, compatible with both positive and negative tone developments.
Implementation Method 1
diffusing the catalyst a predetermined distance from structures of the relief pattern into the overcoat to form soluble regions in the overcoat
Implementation Method 2
exposing the photoresist to actinic radiation to activate a photoacid generator
Implementation Method 3
developing the substrate with the predetermined developer to remove the soluble regions of the overcoat
Data Source
AI summary
A method includes depositing an overcoat in openings of a relief pattern supported by a substrate. The relief pattern includes a solubility-shifting agent. The overcoat and the relief pattern have different solubility-shifting mechanisms. The method further includes generating a catalyst by activating the solubility-shifting agent and diffusing the catalyst a predetermined distance from structures of the relief pattern into the overcoat to form soluble regions in the overcoat. The soluble regions is soluble in a predetermined developer while the relief pattern remains insoluble in the predetermined developer. The method further includes developing the substrate with the predetermined developer to remove the soluble regions of the overcoat.