Compressible Polymer Tip Array for Nanoscale Lithography
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Solution Overview
Problem
Current lithography methods lack a high-resolution, high-throughput, and cost-effective way to pattern molecule-based features across multiple length scales, from nanometers to millimeters, with existing techniques either being limited to specific scales or requiring expensive and fragile cantilever arrays.
Innovation Solution
The use of a compressible polymer tip array with non-cantilevered tips, each having a radius of curvature less than 1 μm, for direct-write patterning on a substrate, allowing for controlled deposition of patterning composition with adjustable feature size and shape through varying contact pressure and time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional DPN uses sharp tips optimized for nanoscale features, then nanoscale resolution is achieved, but the ability to pattern across multiple length scales is lost
Solution Approach 1:
The polymer tip array provides different local geometries at different locations - each tip maintains a sharp apex for nanoscale resolution while the overall array configuration and compressibility enable patterning across multiple length scales. The local tip geometry ensures high resolution while the global array behavior enables multi-scale patterning.
Solution Approach 2:
The polymer tips are made dynamically adjustable through compression. By controlling the compression force, the effective radius of curvature of the tips changes, allowing the same tip to pattern features at different scales. This dynamic adjustment resolves the contradiction between fixed nanoscale optimization and multi-scale versatility.
2Area of stationary object
If two-dimensional cantilever arrays are used for large area patterning, then large area coverage is achieved, but cost and fragility increase
Solution Approach 1:
The polymer tip array replaces expensive, fragile cantilever arrays with inexpensive, robust polymer-based tips. These polymer tips can be easily fabricated and replaced if needed, eliminating the cost and fragility issues associated with traditional cantilever arrays while maintaining large area patterning capability.
Solution Approach 2:
The invention uses composite polymer structures that combine the rigidity needed for precise positioning with the compliance needed for gentle contact printing. This composite approach achieves large area patterning without the complexity and fragility of traditional cantilever arrays.
3Shape
If contact pressure is increased to improve feature uniformity, then feature shape control improves, but resolution may deteriorate
Solution Approach 1:
The polymer tips dynamically adjust their effective radius of curvature under compression. At low compression, the tips maintain sharp geometry for high resolution. As compression increases, the tips flatten slightly to improve contact uniformity and feature shape control. This dynamic adaptation allows simultaneous achievement of resolution and shape uniformity.
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 approach enables high-resolution, high-throughput, and cost-effective patterning across multiple length scales, with features as small as 80 nm, and allows for the arbitrary creation of patterns without the need for expensive cantilever arrays, enhancing the versatility and efficiency of lithography.
Implementation Method 1
contacting the substrate surface for a first contacting period of time and first contacting pressure with all or substantially all of the coated tips of the array and thereby depositing the patterning composition onto the substrate surface
Implementation Method 2
The coating can comprise adsorbing or absorbing the patterning composition onto the tip array
Implementation Method 3
The contacting pressure can be controlled by controlling the z-piezo of a piezo scanner upon which the substrate or tip array is mounted
Implementation Method 4
backlighting the tip array with incident light to cause internal reflection of the incident light from the internal surfaces of the tips
Data Source
AI summary
The disclosure relates to methods of printing indicia on a substrate using a tip array comprised of elastomeric, compressible polymers. The tip array can be prepared using conventional photolithographic methods and can be tailored to have any desired number and/or arrangement of tips. Numerous copies (e.g., greater than 15,000, or greater than 11 million) of a pattern can be made in a parallel fashion in as little as 40 minutes.