Organometallic Oligomer Hardmask for Semiconductor Etch Selectivity
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Solution Overview
Problem
Existing hardmask compositions used in semiconductor manufacturing lack high cross-link density and solvent resistance, limiting their etch selectivity and compatibility with other integrated circuit manufacturing processes.
Innovation Solution
The development of organometallic oligomers and polymers with metal-containing pendant groups, which form metal oxide layers without a separate non-metal binder polymer, offering high cross-link density and excellent solvent resistance through a curing process that forms predominantly metal-oxygen bonds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hardmask compositions are used, then the fabrication process is simpler, but the etch selectivity and solvent resistance are insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the hardmask material by incorporating metal-containing pendant groups (such as titanium, zirconium, hafnium, tungsten, tantalum, or molybdenum) into the polymer structure. This compositional modification enables the material to achieve high etch selectivity and solvent resistance while maintaining fabrication processability through controlled curing to form metal oxide layers.
Solution Approach 2:
The invention creates a composite hardmask material that combines organic polymer components with inorganic metal oxide components. The metal-containing pendant groups are integrated into the polymer backbone, forming a hybrid structure that provides both the processability of organic materials and the etch resistance of inorganic metal oxides, thereby achieving high reliability without excessive complexity.
2Adaptability or versatility
If metal-oxygen polymer compositions are used, then wet developability is achieved, but etch selectivity cannot be adjusted and compatibility with other materials is reduced
Solution Approach 1:
The patent introduces dynamic adjustability to the hardmask composition by allowing variation in metal content, polymer backbone structure, and pendant group configuration. The metal-to-carbon ratio can be controlled to adjust etch selectivity, and the polymer structure can be modified to tune solubility and developability. This dynamic compositional control enables compatibility with different fabrication processes while maintaining adjustable etch selectivity.
Solution Approach 2:
The invention creates a universal hardmask platform that can serve multiple functions: it provides etch resistance through metal oxide formation, maintains wet developability through polymer solubility, and offers compatibility with various fabrication processes. The metal-containing polymer structure can be tailored to work with different etch chemistries and processing conditions, making it adaptable to diverse manufacturing requirements.
3Reliability
If cross-link density is increased, then solvent resistance improves, but manufacturing complexity increases
Solution Approach 1:
The patent employs self-service manufacturing by utilizing the inherent reactivity of metal-containing pendant groups to form cross-linked metal oxide networks during controlled curing processes. The material self-organizes and self-crosslinks through thermal or chemical treatment, eliminating the need for complex external cross-linking equipment or multi-step manufacturing processes. This self-service approach achieves high solvent resistance while maintaining manufacturing simplicity.
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
These compositions enable the formation of hardmask films with enhanced etch selectivity and solvent resistance, improving the compatibility and performance in semiconductor manufacturing processes.
Implementation Method 1
curing the organometallic oligomer to form a metal oxide layer on the electronic device substrate; wherein the organometallic oligomer is chosen from: (i) an oligomer comprising metal-containing pendant groups
Implementation Method 2
forming a cured film with high cross-link density and predominantly metal-oxygen bonds
Implementation Method 3
compositions comprising an organometallic oligomer... that can be used to deposit a film on the surface of an electronic device substrate without the need for a separate non-metal containing binder polymer
Data Source
AI summary
Compositions containing certain organometallic oligomers suitable for use as spin-on, metal hardmasks are provided, where such compositions can be tailored to provide a metal oxide hardmask having a range of etch selectivity. Also provided are methods of depositing metal oxide hardmasks using the present compositions.