Protective Layer Hydrophilicity Tuning for Lithography Patterning
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Solution Overview
Problem
As semiconductor devices shrink in size, the process windows for photolithographic processing become tighter, necessitating advances to maintain the ability to scale down components and improve gap filling, planarity, wet etching resistance, and reduce damage to semiconductor features.
Innovation Solution
The use of improved protective layers, such as bottom anti-reflective coatings (BARC) or spin-on carbon (SOC) coatings, with enhanced gap filling capabilities, increased resistance to wet cleaning and etching, and reduced damage to semiconductor features, achieved through the application of specific photoresist compositions and materials that include polymers, metal nanoparticles, and photoactive compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithographic processing is used to pattern semiconductor devices, then devices can be manufactured with defined patterns, but process windows become tighter as device size decreases
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition and physical properties of the protective layer materials. Specifically, it uses polymers with controlled molecular weights, specific functional groups, and crosslinking densities to optimize the protective layer's performance. The patent also adjusts processing parameters such as coating thickness, curing temperature, and etching conditions to achieve the desired balance between gap filling and process window maintenance
Solution Approach 2:
The patent employs composite materials by combining multiple polymer components with different functions in the protective layer formulation. It uses a base polymer for gap filling, adds functional polymers for adhesion and etch resistance, and incorporates crosslinking agents to enhance mechanical properties. This multi-component composite approach allows simultaneous optimization of multiple competing requirements
2Length of moving object
If device size is reduced to meet consumer demand for smaller devices, then device miniaturization is achieved, but gap filling and planarity become more difficult
Solution Approach 1:
The patent applies local quality by designing protective layers with spatially varying properties. It uses polymers with different viscosities and gap-filling tendencies in specific regions, and employs controlled crosslinking to create local variations in mechanical strength and etch resistance. The formulation includes components that preferentially fill gap regions while maintaining planarity in exposed areas
Solution Approach 2:
The patent changes physical parameters of the protective layer materials to improve gap filling at reduced device dimensions. It adjusts polymer molecular weight distribution, solvent content, and crosslinking density to optimize flow characteristics during coating and final mechanical properties. These parameter adjustments enable effective gap filling even in sub-10nm pitch structures
3Object-affected harmful factors
If protective layers are applied to protect semiconductor features during wet processing, then feature protection is provided, but resistance to wet cleaning and etching must be increased
Solution Approach 1:
The patent applies preliminary anti-action by pre-treating the protective layer to enhance its resistance properties before the actual wet processing step. It uses pre-crosslinking, plasma treatment, or chemical modification to create a more resistant surface layer that will withstand subsequent etching and cleaning operations. This preliminary strengthening prevents feature damage during the harsh wet processing conditions
Solution Approach 2:
The patent uses composite materials with specialized components for etch resistance. It combines polymers with high fluorine or silicon content that provide inherent resistance to common etchants, and incorporates crosslinking agents that create a three-dimensional network structure resistant to chemical attack. The composite formulation balances protection with controlled removability
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
Enhances gap filling, improves planarity, increases resistance to wet cleaning and etching, reduces damage to semiconductor features, and increases yield by providing better protection during wet processing operations.
Implementation Method 1
exposed to an energy that has itself been patterned. Such an exposure modifies the chemical and physical properties of the exposed regions
Implementation Method 2
photoresist compositions and materials that include polymers, metal nanoparticles, and photoactive compounds
Data Source
AI summary
A method of manufacturing a semiconductor device includes forming a protective layer over a substrate. The hydrophilicity of the protective layer is reduced. A resist layer is formed over the protective layer, and the resist layer is patterned. The hydrophilicity of the protective layer can be reduced by applying an ethylene oxide, a propylene oxide or a combination of both to the protective layer.