Organometallic Photoresist Developer Solvent Blends for EUV Pattern Fidelity
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Solution Overview
Problem
Existing organometallic photoresist compositions suffer from high defect densities, particularly microbridging, which impede the formation of high-fidelity patterns essential for advanced semiconductor and electronic device manufacturing.
Innovation Solution
A developer composition comprising a solvent blend with specific Hansen solubility parameters is used to develop radiation-exposed organometallic patterning layers, reducing defect densities by enhancing solubility contrast and improving pattern fidelity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional developers are used to develop organometallic photoresist, then development process is simple, but high defect density (microbridging) occurs
Solution Approach 1:
The patent changes the chemical parameters of the developer by using a solvent blend with specific Hansen solubility parameters (δH+δP ≤ 16 for main solvent, δH+δP ≥ 16 for additive solvent). This parameter optimization creates appropriate solubility contrast to dissolve exposed organometallic photoresist while minimizing microbridge formation, achieving high-fidelity patterns with reduced defect density.
Solution Approach 2:
The patent employs a composite developer system combining a base solvent (ketone, ether, or ester) with specific additive solvents (water, alcohol, glycol ether, pyrrolidone, lactone, or carboxylic acid). This composite approach leverages the complementary properties of different solvents to achieve optimal development performance and minimize defects.
2Manufacturing precision
If solvent blend with specific Hansen parameters is used, then defect density is reduced, but developer composition complexity increases
Solution Approach 1:
The patent establishes clear selection criteria based on Hansen solubility parameters (δH+δP values) to guide developer formulation. By following these parameter guidelines, the complexity of developer composition is managed systematically, ensuring optimal line width roughness control while maintaining practical formulation capabilities.
3Productivity
If radiation exposure is applied to organometallic resist, then pattern formation is achieved, but microbridge defects are generated
Solution Approach 1:
The patent converts the harmful effect of radiation-induced microbridging into a beneficial outcome by using a developer composition specifically designed to dissolve the exposed regions while minimizing defect formation. The solvent blend parameters are optimized to create solubility contrast that eliminates microbridges, transforming a potential defect into a high-fidelity pattern.
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 solvent blend effectively minimizes pattern defects such as microbridging, resulting in high-fidelity patterns with improved line width roughness, essential for high-integration density circuits.
Implementation Method 1
The solvent blend can comprise at least two solvents with at least 55 volume % of one or more solvents each independently having a sum of Hansen solubility parameter δH+δP of no more than about 16 (J/cm3)1/2, and with from about 0.25 volume % to about 45 volume % of one or more solvents each independently having a sum of Hansen solubility parameter δH+δP of at least about 16 (J/cm3)1/2
Data Source
AI summary
Developer compositions are described based on blends of solvents, in which the developers are particularly effective for EUV patterning using organometallic based patterning compositions. Methods for use of these developing compositions are described. The blends of solvents can be selected based on Hansen solubility parameters. Generally, one solvent has low polarity as express by the sum of δP+δH, and a second solvent component of the developer has a higher value of δP+δH. Corresponding solvent compositions are described.