Magnetically-Amplified Resist Lithography Resolving Acid Diffusion
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Solution Overview
Problem
Traditional photolithography technologies face difficulties in achieving high resolution for integrated circuits with feature sizes below 250 nm due to issues like blurring caused by acid diffusion in chemical amplified resists used with deep ultraviolet radiation.
Innovation Solution
The use of magnetically-amplified resist (MAR) materials, which include a polymer, a magnetically-amplified generator that forms magnetic acid upon exposure to radiation, and a quencher, combined with a magnetic field to control acid diffusion and enhance solubility, reducing lateral bias and improving resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chemical amplified resist (CAR) is used with deep ultraviolet radiation, then patterning capability for smaller features is improved, but acid diffusion causes blurring and lateral bias
Solution Approach 1:
The patent introduces a magnetic field as an intermediary to control and confine the photo-generated acid. By applying a magnetic field perpendicular to the substrate, the mobile acid species are constrained to move primarily in the vertical direction rather than diffusing laterally, thus preventing image blurring while maintaining the chemical amplification mechanism's benefits for high-resolution patterning
Solution Approach 2:
The patent changes the physical state and movement characteristics of the acid by applying a magnetic field. This external field parameter modification alters the diffusion behavior of the acid, converting it from uncontrolled lateral diffusion to controlled vertical movement, thereby resolving the contradiction between maintaining chemical amplification and preventing acid diffusion damage
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 magnetic field application in the MAR process reduces acid diffusion, enhances chemical amplification, and improves lithography patterning resolution, addressing the limitations of conventional photoresist materials.
Implementation Method 1
a magnetically-amplified generator that forms magnetic acid upon exposure to radiation
Implementation Method 2
combined with a magnetic field to control acid diffusion and enhance solubility
Data Source
AI summary
A lithography apparatus generates a tunable magnetic field to facilitate processing of photoresist. The lithography apparatus includes a chamber and a substrate stage in the chamber operable to hold a substrate. A magnetic module provides a magnetic field to the substrate on the substrate stage. The magnetic module is configured to provide the magnetic field in a tunable and alternating configuration with respect to its magnitude and frequency. The magnetic field is provided to have a gradient in magnitude along a Z-axis that is perpendicular to the substrate stage to cause magnetically-charged particles disposed over the substrate stage to move up and down along the Z-axis. The lithography apparatus also includes a radiation energy source and an objective lens configured to receive radiation energy from the radiation energy source and direct the radiation energy toward the substrate positioned on the substrate stage.