Pressed Self-Perfection by Liquefaction for Nanoscale Feature Adjustment
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Solution Overview
Problem
Conventional techniques face challenges in accurately producing microscale features with dimensions below 10 nanometers and struggle with defects like line edge roughness and sloped side walls, limiting the precision and density of microscale device fabrication.
Innovation Solution
The process of Pressed Self-Perfection by Liquefaction (P-SPEL) involves providing a microscale device with a soft surface and pressing a guiding plate onto it under pressure, allowing the material to flow laterally and adjust the dimensions of features such as line spacing, hole size, and mesa size, while also repairing defects like line edge roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lithography techniques are used to produce microscale features, then manufacturing process is simple and well-established, but manufacturing precision deteriorates for features below 10 nanometers due to statistical process variations and extrinsic limitations
Solution Approach 1:
The patent applies preliminary action by performing self-perfection by liquefaction immediately after lithography patterning, while the resist is still in a softened state. This timing allows the material to be reshaped before complete solidification, enabling post-lithography dimension adjustment without requiring a completely new fabrication process
Solution Approach 2:
The patent changes the physical state parameter of the resist material from solid to softened/liquid state through thermal or chemical treatment. This parameter change enables the resist to flow and be reshaped under applied pressure, allowing continuous adjustment of feature dimensions beyond the discrete steps of conventional lithography
2Manufacturing precision
If conventional lithography is used for high density patterning, then productivity is maintained, but manufacturing precision deteriorates due to line edge roughness and sloped side walls
Solution Approach 1:
The patent applies self-service by allowing the softened resist material to self-flow and self-reshape under applied pressure. The material automatically redistributes to smooth line edges and form vertical side walls through its own viscous flow, eliminating the need for additional etching or deposition steps to correct these defects
Solution Approach 2:
The patent utilizes phase transition by controlling the resist material to transition from a solid state during lithography exposure to a softened liquid state during the self-perfection process. This phase transition enables the material to flow and be reshaped, then transitions back to solid state to lock in the improved geometry
3Productivity
If feature dimensions are reduced to sub-20 nanometer scale, then device density is improved, but manufacturing precision deteriorates due to increased sensitivity to process variations
Solution Approach 1:
The patent applies dynamics by introducing a continuous, adjustable pressure application process that can dynamically control the degree of material flow. This allows real-time adjustment of feature dimensions during the self-perfection process, enabling precise dimensional control that is not achievable with static conventional lithography processes
Solution Approach 2:
The patent uses the softened resist material itself as an intermediary medium that mediates between the lithography pattern and the final feature geometry. The material's viscous flow properties act as a buffer that smooths out process variations and enables continuous dimension adjustment
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
P-SPEL effectively reduces the lateral dimensions of microscale features to nanoscale sizes, improves shape regularity, and enhances the precision of microscale and nanoscale fabrication, overcoming limitations of conventional lithography techniques by achieving sub-20 nanometer patterns and dense patterns with reduced defects.
Implementation Method 1
Pressing the guiding plate onto the exposed surface causes flow of the soft material laterally between the guiding plate and the substrate
Implementation Method 2
Under pressure, the soft material flows laterally between the guiding plate and the substrate
Data Source
AI summary
In accordance with the invention, a lateral dimension of a microscale device on a substrate is reduced or adjusted by the steps of providing the device with a soft or softened exposed surface; placing a guiding plate adjacent the soft or softened exposed surface; and pressing the guiding plate onto the exposed surface. Under pressure, the soft material flows laterally between the guiding plate and the substrate. Such pressure induced flow can reduce the lateral dimension of line spacing or the size of holes and increase the size of mesas. The same process also can repair defects such as line edge roughness and sloped sidewalls. This process will be referred to herein as pressed self-perfection by liquefaction or P-SPEL.