Field Guided Exposure Chamber for Photolithography
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Solution Overview
Problem
The photolithography process faces challenges in achieving high resolution, precision, and accuracy while maintaining throughput, as smaller feature sizes on integrated circuits lead to issues like lower throughput, increased line edge roughness, and decreased resist sensitivity.
Innovation Solution
A processing chamber with a substrate support and electrode assembly that generates an electric field by applying voltage to a plurality of electrodes, which are configured to split and move vertically to connect and disconnect, allowing for controlled exposure of the photoresist layer to a field with field lines running directly above and parallel to the substrate, enhancing resist sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If small wavelength lithography is used to reduce minimum printable size, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
The patent employs dynamic control of the electrode assembly, which can be positioned at different locations above the substrate to generate electric fields with varying orientations. This dynamic adjustment allows the system to optimize between resolution and throughput by changing field configurations during the lithography process, rather than being fixed in a single operational mode.
Solution Approach 2:
The invention changes physical parameters by applying voltages to electrodes to generate electric fields with different orientations and strengths. By varying the voltage parameters and electrode positions, the system can adjust the electric field characteristics to enhance resist sensitivity without requiring smaller wavelengths, thus maintaining throughput while improving precision.
2Manufacturing precision
If small wavelength lithography is used to reduce minimum printable size, then manufacturing precision is improved, but line edge roughness increases
Solution Approach 1:
The patent introduces an electric field as an intermediary between the light source and the photoresist layer. This electric field acts as a mediator that enhances resist sensitivity and improves pattern definition, thereby reducing line edge roughness without requiring smaller wavelengths. The electric field interacts with the photoresist to sharpen the exposed regions, producing cleaner edges.
3Manufacturing precision
If small wavelength lithography is used to reduce minimum printable size, then manufacturing precision is improved, but resist sensitivity decreases
Solution Approach 1:
The patent replaces the reliance on small wavelength light (optical approach) with an electric field approach. Instead of using mechanical/optical reduction of wavelength to improve precision, the invention uses electric fields to enhance resist sensitivity, thereby improving both precision and sensitivity simultaneously rather than trading one for the other.
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 solution improves the photolithography process by increasing resist sensitivity and maintaining precision and accuracy, addressing the challenges of smaller feature sizes and throughput limitations.
Implementation Method 1
The plurality of electrodes generates an electric field when a voltage is applied
Data Source
AI summary
A method and apparatus disclosed herein apply to processing a substrate, and more specifically to a method and apparatus for improving photolithography processes. The apparatus includes a chamber body, a substrate support disposed within the chamber body, and an electrode assembly. The substrate support has a top plate disposed above the substrate support, a bottom plate disposed below the substrate support, and a plurality of electrodes connecting the top plate to the bottom plate. A voltage is applied to the plurality of electrodes to generate an electric field. Methods for exposing a photoresist layer on a substrate to an electric field are also disclosed herein.