Multi-ligand Metal Oxide Hardmask Stability
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Solution Overview
Problem
Conventional soluble metal compounds used in semiconductor manufacturing are unstable in air, leading to shelf life and coating issues, and have solubility problems in industry-standard solvents, which affects their performance as metal hard masks for via or trench filling and antireflective coatings.
Innovation Solution
Development of novel, multi-ligand-substituted metal oxide compounds with improved stability, formulated into spin-coatable compositions that can be used as stable metal hard masks with good trench or via filling properties and plasma etch resistance, capable of forming stable metal oxide films even after exposure to air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional soluble metal compounds are used as hard masks, then they can be easily applied and removed, but they exhibit poor stability in air and solubility issues
Solution Approach 1:
The patent employs composite material structures by combining metal compounds with organic ligands (such as carboxylic acids, phenols, or alcohols) to form stable coordination complexes. This composite approach allows the material to maintain solubility in standard solvents while simultaneously achieving enhanced stability in air, thus resolving the contradiction between ease of operation and reliability.
Solution Approach 2:
The invention modifies the chemical parameters of metal compounds by substituting ligands with specific functional groups that enhance air stability. By changing the ligand structure (e.g., using multi-dentate ligands or ligands with specific pKa values), the material maintains its solubility characteristics while improving stability, thereby resolving the contradiction between ease of operation and reliability.
2Reliability
If metal compounds with high stability are used, then they provide good shelf life, but they may have reduced solubility in industry-standard solvents
Solution Approach 1:
The patent systematically adjusts ligand parameters such as chain length, functional groups, and denticity to optimize the balance between stability and solubility. By selecting ligands with appropriate hydrophobic/hydrophilic ratios and solubilizing groups, the invention achieves both high shelf life stability and good solubility in industry-standard solvents, resolving the contradiction between reliability and ease of operation.
Solution Approach 2:
The invention creates composite metal-organic complexes where the organic ligand component provides solubility while the metal center provides stability. This composite structure allows simultaneous achievement of shelf life stability and solvent solubility, resolving the contradiction between reliability and ease of operation.
3Object-affected harmful factors
If conventional hard masks are used for pattern transfer, then they provide etch resistance, but they lack sufficient stability for fine pattern formation
Solution Approach 1:
The patent modifies the chemical composition parameters of hard masks by incorporating metal compounds with controlled ligand substitution. This allows tuning of the material properties to achieve both sufficient etch resistance and the stability required for fine pattern formation, resolving the contradiction between etch resistance and manufacturing precision.
Solution Approach 2:
The invention uses composite metal-organic hard mask materials that combine the etch resistance of metal oxides with the stability and processability of organic ligands. This composite structure provides both etch resistance and the stability needed for precise pattern formation, resolving the contradiction between etch resistance and manufacturing precision.
4Reliability
If multi-ligand-substituted metal compounds are synthesized, then stability and solubility are improved, but the synthesis complexity increases
Solution Approach 1:
The patent employs a segmented synthesis approach where the metal compound is first synthesized with one set of ligands, and then additional ligand substitution is performed in a second step. This segmentation of the synthesis process into manageable stages reduces overall complexity while still achieving the desired multi-ligand-substituted product with improved stability and solubility.
Solution Approach 2:
The invention uses preliminary action by pre-synthesizing metal compounds with labile ligands that can be easily replaced. This preliminary preparation simplifies the subsequent ligand substitution steps, reducing the overall synthesis complexity while achieving the target multi-ligand-substituted structure with improved properties.
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 novel metal oxide compounds provide enhanced stability and performance as hard masks, maintaining lithographic properties for up to 24 hours and allowing for effective removal by chemical solutions, while offering improved etch resistance in oxygen-based plasmas, enabling precise pattern transfer and image reversal.
Implementation Method 1
novel, multi-ligand-substituted metal oxide compounds with improved stability, formulated into spin-coatable compositions that can be used as stable metal hard masks... capable of forming stable metal oxide films even after exposure to air
Implementation Method 2
good plasma etch resistance in oxygen based plasmas... offering improved etch resistance in oxygen-based plasmas
Data Source
AI summary
The present invention relates to novel, soluble, multi-ligand-substituted metal oxide compounds to form metal oxide films with improved stability as well as compositions made from them and methods of their use. Specifically, the invention pertains to a compounds having structure (I), wherein M is a metal and n is 1 to 20, and wherein at least one of R1, R2, R3, and R4 is i) and at least at least one of R1, R2, R3, and R4 is ii), where i) is a silicon bearing organic moiety having at least 2 carbons, and ii) is an organic moiety. The invention also relates to spin-coatable composition of compounds of structure (I) dissolved into a solvent. The present invention further relates to processes using this spin coatable composition to form a coating on a patterned substrate.