Doped Metallic Resist Patterning for Low-Roughness Lithography
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Solution Overview
Problem
As semiconductor devices shrink in size, the process windows for photolithographic processing become tighter, necessitating advances in photolithographic technologies to maintain the ability to scale down components while improving line width roughness and reducing defects.
Innovation Solution
The introduction of dopants such as photoacid generators, quenchers, photobase generators, crosslinkers, and high boiling point solvents into metallic resist compositions to enhance lithographic performance, including improved line width roughness and reduced exposure doses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithographic processing is used to pattern semiconductor devices, then devices can be manufactured with standard process windows, but as device size decreases, the process windows become tighter and manufacturing precision deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters of the photoresist material by incorporating dopants such as photoacid generators, quenchers, photobase generators, crosslinkers, and high boiling point solvents. These parameter changes in the resist composition enable improved line width roughness and reduced exposure doses, allowing precise patterning at smaller device dimensions despite tighter process windows
Solution Approach 2:
The patent creates a composite photoresist material system by combining metallic resist composition with multiple functional dopants. This composite material approach integrates photoacid generators for pattern formation, quenchers for contrast enhancement, photobase generators for solubility modification, crosslinkers for adhesion improvement, and high boiling point solvents for process stability, collectively resolving the manufacturing precision challenge at scaled dimensions
2Manufacturing precision
If photolithographic processing is used to pattern semiconductor devices, then devices can be manufactured with conventional exposure doses, but as device size decreases, exposure doses must be reduced and process control becomes more difficult
Solution Approach 1:
The patent changes the photochemical parameters of the resist by incorporating photoacid generators and quenchers, which modify the exposure characteristics. This enables reduced exposure doses below 70 mj while maintaining pattern resolution, as the dopants enhance the photochemical efficiency and contrast of the resist material
Solution Approach 2:
The patent introduces photoacid generators and photobase generators as intermediary substances that mediate the photochemical reaction process. These intermediaries convert incident radiation into chemical changes more efficiently, enabling reduced exposure doses while achieving the required pattern resolution for scaled devices
3Manufacturing precision
If dopants are added to metallic resist composition, then line width roughness is reduced and exposure doses are lowered, but the resist composition becomes more complex
Solution Approach 1:
The patent designs the dopant system where each additive serves multiple functions: photoacid generators enable pattern formation and enhance solubility changes; quenchers provide contrast enhancement and control diffusion; photobase generators modify solubility characteristics; crosslinkers improve adhesion; high boiling point solvents enhance process stability. This multi-functionality reduces the need for separate materials and processes, managing the complexity while achieving improved line width roughness
Solution Approach 2:
The patent combines multiple functional dopants into a single integrated resist composition formulation. By merging photoacid generators, quenchers, photobase generators, crosslinkers, and high boiling point solvents into one cohesive material system, the patent simplifies the manufacturing process despite the enhanced functionality, managing composition complexity while achieving superior patterning results
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 results in reduced line width roughness to less than 5.0 nm and exposure doses below 70 mj, enhancing pattern resolution and device yield.
Implementation Method 1
The resist composition includes a photoacid generator or a photobase generator. The photoacid generator or the photobase generator may be the same or different from each other. The dopant may be the same or different from each other.
Implementation Method 2
The dopant may be the same or different from each other.
Implementation Method 3
modifies the chemical and physical properties of the exposed regions of the photosensitive material. This modification, along with the lack of modification in regions of the photosensitive material that were not exposed, can be exploited to remove one region without removing the other
Data Source
AI summary
A method of manufacturing a semiconductor device includes forming a dopant layer including a dopant composition over a substrate. A resist layer including a resist composition is formed over the dopant layer. A dopant is diffused from the dopant composition in the dopant layer into the resist layer; and a pattern is formed in the resist layer.