Silicon Planarizing Film Composition for Thick Crack-Resistant Coatings
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Solution Overview
Problem
Advanced semiconductor manufacturing requires dielectric materials that can planarize deep trenches, be crack-resistant at thicknesses exceeding 6 µm, and maintain high optical transmittance and thermal stability at temperatures above 400°C.
Innovation Solution
A composition comprising a silicon-based material, a polysiloxane resin formed from monomers like methyltriethoxysilane and phenyl triethoxysilane, a cross-linker with a siloxane compound, and a catalyst, which is applied via spin-coating or slot coating to form a planarizing film that is thermally stable and crack-resistant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If dielectric material thickness is increased to fill deep trenches (6 µm or deeper), then planarization capability is improved, but crack resistance deteriorates
Solution Approach 1:
The patent employs a composite dielectric material system comprising siloxane polymer composition with specific cross-linking agents and fillers. This composite structure combines multiple materials with complementary properties: the siloxane base provides flexibility and adhesion, cross-linking agents enhance mechanical strength and thermal stability, and fillers improve crack resistance. The synergistic combination allows the film to maintain integrity at thicknesses of 6 µm or deeper without cracking.
Solution Approach 2:
The patent optimizes chemical composition parameters including the ratio of cross-linking agents to base polymers, filler content and distribution, and molecular weight of polymer chains. By adjusting these parameters, the material achieves optimal balance between flexibility (for thick film application) and strength (for crack resistance). The cross-linking density and filler dispersion are controlled to prevent stress concentration that would lead to cracking in thick films.
2Length of stationary object
If dielectric material thickness is increased to fill deep trenches, then planarization capability is improved, but thermal stability deteriorates at temperatures exceeding 400°C
Solution Approach 1:
The composite dielectric material incorporates thermally stable components including metal oxide fillers (such as silica, alumina) and thermally resistant cross-linking agents. These materials maintain their structural integrity and chemical stability at temperatures exceeding 400°C, preventing degradation, outgassing, or phase separation that would compromise the thick film's performance during semiconductor manufacturing processes.
Solution Approach 2:
The patent selects and optimizes materials with high glass transition temperatures and stable molecular structures that resist thermal degradation. The cross-linking architecture is designed to create thermally stable three-dimensional networks that prevent polymer chain mobility and decomposition at elevated temperatures, ensuring the thick dielectric film maintains its mechanical and electrical properties during subsequent processing steps.
3Reliability
If dielectric material is optimized for crack resistance, then reliability is improved, but optical transmittance deteriorates
Solution Approach 1:
The patent employs filler materials with controlled size distribution and refractive index matching to the polymer matrix. By optimizing the local optical properties through proper filler selection and dispersion, the material achieves high optical transmittance in the visible spectrum while maintaining crack resistance. The filler size and spacing are controlled to minimize light scattering, allowing the thick film to remain optically clear for optoelectronic applications.
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 solution provides a planarizing film with excellent crack-resistance and high optical transmittance, maintaining strength and thermal stability even at thicknesses greater than 6 µm and temperatures exceeding 400°C, suitable for advanced semiconductor devices.
Implementation Method 1
a cross-linker including a siloxane compound according to the general formula: wherein R is an aliphatic comprising group and R 1, R 2, R 3, R 4, R 5, and R 6 are each independently selected from the group consisting of: H or an alkyl group with substituted or unsubstituted carbons
Implementation Method 2
a polysiloxane resin, wherein said polysiloxane resin is formed from monomers consisting of methyltriethoxysilane, dimethyldiethoxysilane and phenyl triethoxysilane
Implementation Method 3
there is a need for dielectric materials which can be spin-coated onto a surface of a device
Data Source
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AI summary
A composition for planarizing a surface of a semiconductor device includes a silicon-based material including a siloxane, a silsesquioxane, a polysiloxane, a polysilsesquioxane, and/or a polysiloxane resin, together with at least one solvent, a catalyst, and a cross-linker including a siloxane compound.