Tilted Polymer-Pen Array for Combinatorial Pattern Generation
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Solution Overview
Problem
Polymer-pen lithography faces challenges in achieving precise leveling between the pen array and substrate, leading to misalignment and significant deviations in feature size due to the inability to control the tilt geometry effectively, which affects the uniformity and precision of pattern elements printed.
Innovation Solution
A method involving deliberate tilting of the pen array with specific tilt geometry, comprising first and second angles relative to the substrate axes, allows for controlled deformation of tips, enabling precise control over feature size variations across the substrate surface by adjusting the tilt angles, thereby achieving a range of pattern element sizes in a single printing step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical methods are used to judge alignment between pen array and substrate, then the leveling process is simple, but the alignment precision is insufficient (only able to level within 0.01°)
Solution Approach 1:
The patent implements a feedback mechanism where the force between the pen array and substrate is continuously monitored, and the tilt angle is adjusted based on this force feedback to achieve precise leveling. This allows the system to automatically compensate for misalignment and maintain optimal contact pressure across all pens, resolving the contradiction between simple leveling process and high alignment precision.
Solution Approach 2:
The patent replaces optical measurement methods with a force-based mechanical measurement system to determine alignment. By measuring the force exerted by the pen array on the substrate and using this information to calculate tilt angle, the system achieves superior precision (within 1×10⁻⁴ degree) compared to optical methods, while maintaining operational simplicity.
2Manufacturing precision
If the pen array is deliberately tilted to control feature size, then the feature size control is improved, but the uniformity of pattern elements deteriorates
Solution Approach 1:
The patent systematically varies the tilt angle parameter to control feature size distribution. By adjusting the tilt angle within specific ranges (e.g., 0.01° to 0.1°), the system achieves precise control over feature size variations while maintaining uniformity. The force feedback mechanism ensures that despite the deliberate tilt, all pens maintain optimal contact pressure, preventing uniformity deterioration.
3Manufacturing precision
If force feedback leveling is used to achieve high alignment precision, then the feature size uniformity is improved (variance less than 2% over 1 cm), but the device complexity increases
Solution Approach 1:
The patent implements a self-service leveling mechanism where the pen array itself, through its elastic deformation and force feedback, automatically adjusts to achieve optimal alignment. The system uses the inherent properties of the elastomeric pens and the force they exert on the substrate to self-correct misalignment, eliminating the need for complex external leveling apparatus while achieving feature size uniformity of less than 2% over 1 cm.
4Productivity
If a massively parallel array of elastomeric tips is used, then the throughput is increased, but the control over individual tip deformation deteriorates
Solution Approach 1:
The patent applies local quality control by deliberately introducing spatial variation in tip deformation through controlled tilting. Different regions of the pen array experience different deformation levels based on their position relative to the tilt axis, allowing independent control of feature sizes across the array. This enables high throughput from the massively parallel structure while maintaining precise control over individual tip deformation through the force feedback mechanism.
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-throughput fabrication of combinatorial arrays with precise control over feature sizes, reducing size variance to less than 2% across a 1 cm distance, and allows for the creation of patterns with gradients of feature sizes, enhancing the precision and uniformity of polymer pen lithography.
Implementation Method 1
the elastomeric tips deform upon contact with the surface, thus increasing the contact area and in turn, the feature edge length
Implementation Method 2
by maximizing the force between the pen array and the substrate upon a given z-piezo extension
Data Source
AI summary
The disclosure relates to a method of forming a pattern having pattern elements with a plurality of sizes on a substrate surface with a tilted pen array that includes choosing a tilt geometry for a pen array with respect to a substrate, inducing the tilt geometry between the pen array and the substrate surface, and forming a pattern having pattern elements on the substrate surface with the titled pen array, whereby the size of the formed pattern elements varies across the substrate surface along the tilted axis or axes. For example, the tilt geometry is in reference to the substrate surface and comprises a first angle with respect to a first axis of the substrate and a second angle with respect to a second axis of the substrate, the second axis being perpendicular to the first axis, and at least one of the first and second angles being non-zero.