Selective Template Removal for Perforated Thin-Film Fabrication
Solution Overview
Problem
Conventional micro- and nano-fabrication methods are costly and inefficient for producing large-area micro- and nano-structured devices, as they require expensive equipment and processes that are not scalable for high-volume, low-cost production, especially for devices larger than 1 cm^2, and often rely on lift-off or etching techniques that limit throughput and structural robustness.
Innovation Solution
A method involving a micro- or nano-structure template with raised features, where a thin-film coating is deposited and a potting material is applied to encapsulate the thin-film caps, allowing for selective removal without lift-off or etching, thereby creating perforated thin-films and shaped particles with improved adhesion and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional wafer-scale micro- or nano-fabrication methods are used, then manufacturing precision and device performance are achieved, but the cost per unit area becomes excessively high for large-area devices
Solution Approach 1:
The invention segments the fabrication process into two distinct stages: (1) creating a master template with precise micro- or nano-structures using conventional high-precision methods, and (2) replicating this template onto multiple substrates using a transfer printing process. This segmentation allows the expensive precision fabrication to be performed only once on the master template, while subsequent replicas are produced at lower cost, thereby resolving the contradiction between manufacturing precision and manufacturing cost for large-area devices
Solution Approach 2:
The invention creates a master template containing the desired micro- or nano-structure pattern, then uses this template to generate multiple replica substrates through a transfer printing process. The replica substrates are copied from the master template, allowing precise patterns to be reproduced at lower cost across multiple devices or large areas, thus reducing the cost per unit area while maintaining fabrication precision
2Area of stationary object
If optical lithography is used for patterning, then large area coverage is achieved, but the minimum feature size precision is insufficient for precision nano-structures
Solution Approach 1:
The invention segments the patterning function between optical lithography (used only for creating the master template pattern) and the subsequent template replication process (used for transferring patterns to final substrates). This allows optical lithography to provide large area coverage for the master template, while the replication process preserves precision nano-structure features when transferring to multiple substrates, thereby resolving the contradiction between area coverage and feature size precision
3Manufacturing precision
If focused ion beam (FIB) or electron beam lithography is used for direct patterning, then precision nano-structures are achieved, but the throughput is too low for large-area device fabrication
Solution Approach 1:
The invention segments the precision patterning task from the mass production task: FIB or electron beam lithography is used only to create the master template with precise nano-structures, while the transfer printing process handles the mass replication to multiple substrates. This segmentation allows high-precision patterning to be performed once on the master template, then replicated at high throughput to multiple devices or large areas, thereby resolving the contradiction between nano-structure precision and fabrication throughput
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 method reduces manufacturing costs per unit area, increases fabrication throughput, and enhances the structural robustness and material range for micro- and nano-structured devices, enabling the production of large-area devices at a lower cost and with higher precision.
Implementation Method 1
a thin-film material is deposited on a template substrate
Implementation Method 2
the thin-film material is deposited on a template substrate with raised micro- or nano-structures
Implementation Method 3
the cured potting material is removed from the template, leaving the thin-film material adhering to the raised micro- or nano-structures
Data Source
AI summary
A method to remove selected parts of a thin-film material otherwise uniformly deposited over a template is disclosed. The methods rely on a suitable potting material to encapsulate and snatch the deposited material on apexes of the template. The process may yield one and/or two devices during a single process step: (i) thin-film material(s) with micro- and/or nano-perforations defined by the shape of template apexes, and (ii) micro- and/or nano-particles shaped and positioned in the potting material by the design of the template apexes. The devices made from this method may find applications in fabrication of mechanical, chemical, electrical and optical devices.