Beta-Diketone Metal Complex Resist for EUV Lithography
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Solution Overview
Problem
Current resist compositions face challenges in achieving high resolution and sensitivity while minimizing line edge roughness (LER) and avoiding image blur due to acid diffusion, especially at feature sizes below 100 nm, and they often require toxic solvents for coating, which complicates industrial application.
Innovation Solution
A negative resist composition comprising a metal complex of β-diketone with metals like magnesium, chromium, manganese, and hafnium, which is electroconductive and uses safer solvents like water and alcohols, preventing charging during electron beam writing and forming patterns with minimal LER.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemically amplified resist materials are used to enhance sensitivity and contrast, then sensitivity and contrast are improved, but acid diffusion causes image blur and line edge roughness at feature sizes below 100 nm
Solution Approach 1:
The patent extracts and eliminates the acid diffusion mechanism from the resist system by using non-chemically amplified resist materials. Instead of relying on acid-catalyzed reactions that cause diffusion, the invention uses direct photochemical or electron-beam-induced reactions that occur only at the exposed locations, thereby removing the source of image blur while maintaining sensitivity through alternative chemical mechanisms.
Solution Approach 2:
The patent changes the fundamental reaction mechanism parameter from acid-catalyzed chemical amplification to direct photochemical or radiolytic reactions. This parameter change eliminates the diffusion component while allowing the system to maintain sensitivity through high quantum efficiency or high linear energy transfer of the exposure radiation.
2Manufacturing precision
If resist film thickness is reduced below 100 nm to achieve smaller feature sizes, then resolution is improved, but structural strength and adhesion are compromised
Solution Approach 1:
The patent employs composite resist formulations that combine multiple functional components: the resist polymer matrix, crosslinking agents, and reinforcing fillers or additives. This composite structure provides the mechanical strength and adhesion required for thin films while maintaining the chemical properties needed for high-resolution patterning at reduced thicknesses.
3Manufacturing precision
If non-chemically amplified resist materials like PMMA are used to reduce acid diffusion, then line edge roughness is reduced, but etch resistance and outgassing performance are poor
Solution Approach 1:
The patent merges the advantages of different resist material classes by combining the low line edge roughness characteristics of non-chemically amplified materials with the high etch resistance of chemically amplified or crosslinked systems. This is achieved through multi-component formulations that integrate polymers with appropriate glass transition temperatures, crosslinking agents for etch resistance, and additives to control outgassing behavior.
4Ease of manufacture
If toxic solvents are used in resist composition to achieve proper coating properties, then film formation is improved, but safety and environmental compliance are compromised
Solution Approach 1:
The patent changes the solvent system parameters from traditional toxic organic solvents to safer alternatives such as water, alcohols, or other environmentally benign solvents. This parameter change requires adjustments in resist formulation chemistry, polymer selection, and processing conditions, but achieves the same film formation quality while eliminating or reducing toxic hazards.
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 composition achieves high resolution and sensitivity with minimal LER, is suitable for VLSI and photomask fabrication, and avoids the use of toxic solvents, making it suitable for commercial applications in EB and EUV lithography.
Implementation Method 1
a negative resist composition comprising a metal complex of a β-diketone... which is electroconductive and uses safer solvents like water and alcohols, preventing charging during electron beam writing
Implementation Method 2
Hydrogensilsesquioxane (HSQ) is a negative resist material which turns insoluble in alkaline developer through crosslinking by condensation reaction of silanol generated upon exposure to EB or EUV
Implementation Method 3
uses safer solvents like water and alcohols
Data Source
AI summary
A resist composition comprising a complex of a β-diketone with a metal selected from magnesium, chromium, manganese, iron, cobalt, nickel, copper, zinc, silver, cadmium, indium, tin, antimony, cesium, zirconium, and hafnium, and a solvent is improved in film uniformity when coated, and exhibits a high resolution, high sensitivity, and minimal LER when processed by the EB or EUV lithography.