Surface Plasmon Nanopatterning for Sub-100 nm Semiconductor Lithography
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Solution Overview
Problem
Current techniques, such as photolithography, face limitations in forming fine patterns with linewidths of 100 nm or less for semiconductor and display devices, necessitating the development of high-density nano-patterning methods.
Innovation Solution
A method utilizing surface plasmons to form nanopatterns by creating a metal pattern with thin film portions between lines, exciting surface plasmons with light irradiation to expose a photoresist layer, and using the resulting pattern as a mask for etching, allowing for the formation of fine patterns with linewidths of 30 to 100 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithography is used for patterning, then the process is simple and widely applicable, but the linewidth cannot be reduced to 100 nm or less
Solution Approach 1:
The patterning process is divided into multiple stages: first forming a metal pattern with lines at predetermined spacing, then using this as a template to generate a higher-density photoresist pattern through surface plasmon excitation. This segmentation allows achieving fine linewidths that cannot be obtained by single-step photolithography.
Solution Approach 2:
A metal pattern layer is introduced as an intermediary between the photolithography step and the final pattern formation. This metal pattern serves as a template that, when combined with surface plasmon excitation, enables the formation of ultrafine patterns with linewidths of 100 nm or less that are unachievable by conventional photolithography alone.
2Manufacturing precision
If electron-beam lithography or nanoimprint is used to achieve fine patterns, then linewidth of 100 nm or less can be formed, but the manufacturing process becomes more complex and costly
Solution Approach 1:
The metal pattern is used as a master template that is copied onto the photoresist layer through surface plasmon-mediated exposure. This copying mechanism allows the transfer of the metal pattern geometry to create high-density photoresist patterns, achieving fine linewidths with a process that remains simpler and more cost-effective than electron-beam lithography or nanoimprint.
3Productivity
If conventional photolithography is used, then the process is straightforward, but high-density patterns with fine linewidth cannot be achieved
Solution Approach 1:
The invention introduces a vertical dimension by stacking the metal pattern layer above the photoresist layer, with the metal pattern serving as a three-dimensional template. When light passes through the metal pattern and excites surface plasmons, it creates an enhanced exposure effect in the photoresist, enabling high-density pattern formation with fine linewidths that cannot be achieved by planar photolithography alone.
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
Enables the creation of high-density, fine patterns with improved pattern density and uniformity, suitable for semiconductor and display device applications, overcoming the limitations of traditional photolithography.
Implementation Method 1
exciting surface plasmons in the metal pattern by light irradiation to expose the first photoresist layer to form a first pattern shape
Data Source
AI summary
A method for forming a fine pattern includes forming an etching target material layer on a substrate, forming a first photoresist layer on the etching target material layer, forming a metal pattern on the first photoresist layer, the metal pattern having a plurality of lines and thin film lines alternately arranged, the lines having predetermined linewidth and thickness and are spaced apart from each other by a predetermined distance, exciting surface plasmons in the metal pattern by light irradiation to produce a surface plasmon resonance that exposes a fine first pattern shape in the first photoresist layer, forming a first photoresist pattern by removing the metal pattern and developing the first photoresist layer, and etching the etching target material layer by using the first photoresist pattern as a mask.