Hard Mask Patterning via Charged Particle Exposure
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Solution Overview
Problem
Current charged-particle lithography techniques face challenges in maintaining the integrity of hard masks during nano-scale feature formation on non-planar surfaces due to the limitations of polymer-based resist materials and the risk of resist collapse or deformation, especially when forming high-aspect-ratio structures.
Innovation Solution
The use of atomic layer deposition (ALD) or molecular layer deposition (MLD) to form a hard mask, combined with photon or charged particle-induced etching or deposition processes, eliminates the need for resist materials and prevents undesirable collapse or deformation by creating precise nano patterns directly on the substrate, utilizing exposure masks to control the patterning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If polymer-based resist materials are used in charged-particle lithography, then the fundamental process mechanism of bond dissociation or bond association can be achieved, but resist collapse or deformation occurs during high-aspect-ratio structure formation
Solution Approach 1:
The patent removes polymer-based resist materials from the lithography process entirely. Instead, it uses direct charged-particle beam writing on substrates or with inorganic mask materials, eliminating the resist collapse problem while maintaining patterning precision through direct energy deposition and material modification
Solution Approach 2:
The patent changes the material parameter from organic polymer resist to inorganic mask materials or direct substrate modification. This parameter change transforms the mechanical properties from flexible polymer structures to rigid inorganic structures that maintain integrity during high-aspect-ratio patterning
2Length of moving object
If high-aspect-ratio structures are formed using conventional resist, then nano-scale features can be created, but the resist structure becomes unstable and deforms
Solution Approach 1:
The patent replaces the mechanical resist structure with a direct energy-field-based patterning approach. Charged particles directly modify the substrate or mask material through energy deposition, eliminating the need for mechanical resist structures that are prone to deformation in high-aspect-ratio applications
Solution Approach 2:
The patent employs inorganic composite mask materials or direct substrate materials that combine the desired patterning properties with high structural stability. These materials maintain their composition and structure during the patterning process, enabling reliable high-aspect-ratio feature formation
3Ease of manufacture
If polymer-based resist is used, then the lithography process can proceed with standard materials, but the selection of resist materials is limited and additional development steps are required
Solution Approach 1:
The patent extracts and removes the resist material step from the conventional lithography process. By using direct charged-particle beam writing or inorganic masks, it eliminates the need for resist material selection, coating, and development steps, simplifying the overall manufacturing process while expanding material compatibility
Solution Approach 2:
The patent creates a universal patterning approach that works across different substrate and mask materials without requiring specific resist materials. The charged-particle beam directly interacts with various inorganic materials, providing versatility in material selection while reducing process complexity
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 allows for precise and reliable formation of nano-scale features without resist deformation, enabling high-aspect-ratio patterning and reducing the need for resist development, thereby enhancing the fabrication of integrated circuits with improved accuracy and reliability.
Implementation Method 1
The exposure mask is exposed to patterning particles to sputter a gap in the hard mask
Implementation Method 2
exposing the exposure mask to patterning particles to etch a gap in the hard mask
Data Source
AI summary
A process for fabricating an integrated circuit is provided. The process includes providing a substrate and forming a hard mask on the substrate. The hard mask may be formed by atomic-layer deposition (ALD) or molecular-layer deposition (MLD). The process also includes disposing an exposure mask over the hard mask and exposing the exposure mask to a patterning particle to pattern a gap in the hard mask. The patterning particle may be, for example, a photon or a charged particle.