Photoacid Generator Nitrogen-Base Functional Component
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Solution Overview
Problem
Current photoresist compositions struggle to achieve highly resolved images of submicron dimensions, as existing photoacid generator compounds do not effectively restrict photoacid diffusion into unexposed regions, leading to inadequate contrast and resolution between exposed and unexposed areas.
Innovation Solution
The development of new photoacid generator compounds with a nitrogen-base functional component of the structure —C(═O)N<, specifically non-cyclic amides, lactams, or imides, which act as hydrogen-bond acceptors and anionic components like sulfonic acid groups, effectively localize photoacid generation to exposed regions by complexing with acidic groups, preventing undesired diffusion and enhancing contrast and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional photoacid generator compounds are used, then photoresist compositions can be formed, but photoacid diffusion into unexposed regions occurs leading to poor resolution and contrast
Solution Approach 1:
The patent introduces a base component (such as a nitrogen-containing compound or metal oxide) as an intermediary substance that selectively neutralizes photoacid in unexposed regions. This base component acts as a buffer, capturing diffused photoacid before it can blur the latent image boundaries, thereby maintaining sharp resolution while allowing controlled acid generation in exposed regions
Solution Approach 2:
The patent creates spatially differentiated properties within the photoresist composition by incorporating base components that are strategically positioned or activated. In unexposed regions, the base component remains active to neutralize diffused photoacid, while in exposed regions, the photoacid generation overwhelms the base component, allowing the intended chemical amplification to proceed. This local differentiation enables simultaneous acid generation control and diffusion prevention
2Reliability
If conventional photoacid generator compounds are used, then photoresist compositions can function, but contrast between exposed and unexposed regions is insufficient
Solution Approach 1:
The base component serves as a mediator that enhances contrast by selectively removing photoacid from unexposed regions. This creates a sharper distinction between exposed and unexposed areas, as the base component prevents background acid accumulation that would otherwise reduce image contrast
Solution Approach 2:
The patent modifies the chemical environment parameters by introducing base components with specific pKa values and buffering capacities. These parameter changes create a more pronounced chemical difference between exposed and unexposed regions, enhancing the contrast of the latent image and subsequent developed image
3Manufacturing precision
If photoacid diffusion is not restricted, then photoresist processing is simple, but submicron dimension imaging cannot be achieved
Solution Approach 1:
The patent creates a composite photoresist system combining photoacid generator compounds with base components (such as nitrogen-containing compounds or metal oxides). This composite formulation provides built-in photoacid diffusion control through the base component's neutralization capability, enabling submicron resolution without requiring additional complex processing equipment or steps
Solution Approach 2:
The base component within the photoresist composition provides self-service by automatically neutralizing diffused photoacid in unexposed regions. This self-regulating mechanism eliminates the need for external intervention or additional processing steps to control photoacid diffusion, maintaining process simplicity while achieving high resolution
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 compounds minimize photoacid diffusion into unexposed regions, allowing for enhanced contrast and resolution between exposed and unexposed areas, enabling the formation of highly resolved patterned images with sub-quarter micron dimensions, suitable for advanced imaging applications such as sub-200 nm wavelengths.
Implementation Method 1
act as hydrogen-bond acceptors and anionic components like sulfonic acid groups, effectively localize photoacid generation to exposed regions by complexing with acidic groups
Implementation Method 2
complexing with acidic groups, preventing undesired diffusion
Implementation Method 3
the coating is exposed through a patterned photomask to a source of activating energy such as ultraviolet light to form a latent image in the photoresist coating
Data Source
AI summary
New photoacid generator compounds are provided that comprise a nitrogen-base functional component of the structure —C(═O)N<. Photoresist compositions also are provided that comprise one or more PAGs of the invention.