Nanoimprint Adhesive Layer Design for Uniform Thin Films
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Solution Overview
Problem
Current nanoimprint techniques face challenges in forming microfine structures with a thin and uniform remaining film on substrates, leading to defects and reduced repeatable transfer times due to insufficient adhesion between the resin layer and the substrate, especially as pattern sizes and aspect ratios increase.
Innovation Solution
A method involving the formation of a metallic thin film, an oxide layer, and a photocurable resin layer with specific adhesive layers that include compounds with hydrolysable and reactive functional groups to enhance chemical bonding, allowing for the transfer of microfine structures with improved adhesion and repeatable transfer capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single adhesive layer is used in nanoimprint technology, then the structure is simple, but the adhesion between resin layer and substrate is insufficient leading to defects and reduced repeatable transfer times
Solution Approach 1:
The adhesive layer is divided into two distinct layers: a first adhesive layer containing silane coupling agents that bond to the substrate, and a second adhesive layer containing different silane coupling agents that bond to the resin layer. This segmentation allows each layer to be optimized for its specific bonding function, resulting in significantly improved repeatable transfer times and reduced pattern defects compared to a single adhesive layer structure.
Solution Approach 2:
The adhesive structure uses composite materials with different silane coupling agents in each layer. The first adhesive layer uses silane coupling agents suitable for substrate bonding, while the second adhesive layer uses silane coupling agents optimized for resin layer bonding. This composite approach creates superior interfacial adhesion and enables high-repeatable transfer operations.
2Manufacturing precision
If the remaining film thickness is reduced to achieve higher precision, then the manufacturing precision improves, but the adhesion becomes insufficient causing pattern defects
Solution Approach 1:
The dual-layer adhesive structure with different silane coupling agents provides sufficient bonding strength even when the remaining film thickness is reduced to achieve high manufacturing precision. The composite adhesive layers ensure that pattern transfer quality is maintained without defects, allowing the system to achieve both thin uniform remaining films and high reliability.
3Manufacturing precision
If conventional photolithography is used for pattern formation, then the process is simple, but it cannot achieve the required precision for extremely small patterns
Solution Approach 1:
The invention replaces the optical-based photolithography system with a mechanical nanoimprint system. Instead of using light exposure and photoresist chemistry, the system uses a stamper with physical patterns that is pressed onto the resin layer to transfer the pattern directly. This mechanical substitution enables manufacturing precision for extremely small patterns that cannot be achieved with conventional photolithography.
4Manufacturing precision
If electron beam lithography is used to achieve higher precision, then the pattern dimension accuracy improves, but the exposure time increases significantly reducing productivity
Solution Approach 1:
The invention replaces the electron beam lithography process with a mechanical nanoimprint process. Instead of using electron beams to draw patterns point-by-point or line-by-line, the system uses a pre-fabricated stamper that contains the complete pattern. Pressing the stamper onto the resin layer transfers the entire pattern in one operation, achieving high manufacturing precision without the time-consuming exposure process of electron beam lithography.
Solution Approach 2:
The pattern is pre-formed on the stamper before the imprinting process. This preliminary action allows the complete pattern to be transferred to the resin layer in a single pressing operation, eliminating the need for time-consuming electron beam exposure and significantly improving productivity while maintaining high manufacturing precision.
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 achieves a thinner and more uniform remaining film on the substrate, significantly increasing the number of repeatable transfer times while maintaining high accuracy and reducing defect rates, even at larger pattern sizes and aspect ratios.
Implementation Method 1
the adhesive layer comprises a first adhesive layer adhering to the surface of the oxide layer and the second adhesive layer adhering to the photocurable resin layer, wherein the first and second adhesive layers respectively comprise a compound having a functional group
Implementation Method 2
the compound of the second adhesive layer has at least a hydrolysable functional group which form a chemical bond with the compound of the first adhesive layer
Implementation Method 3
forming a photocurable resin layer on a surface of the oxide layer
Data Source
AI summary
Provided are a method for forming a microfine structure and a microfine structure forming body prepared by the method. The method allows a remaining film part to be formed thinner and more uniform on a substrate than the conventional techniques. The method comprises the steps of: forming an oxide layer on a metallic thin film; a photocurable resin layer via first and second adhesive layers over the oxide layer; and transferring a microfine structure formed on a mold by pressing the mold onto the photocurable resin layer. The first adhesive layer includes a compound having at least two hydrolysable functional groups, and the second adhesive layer includes a compound having at least a hydrolysable functional group and a reactive functional group.