Patterned Layer Formation via Basic Compound Neutralization
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Solution Overview
Problem
Substrate Conformal Imprint Lithography (SCIL) faces challenges in achieving reproducible patterned layers due to the retarding effect of acidic sites on the substrate surface, leading to prolonged imprinting times and compromised properties of the resulting patterned layers, especially on substrates like aluminum and chromium.
Innovation Solution
Applying a layer of a compound with basic groups to the substrate surface prior to the polycondensable imprinting composition, which neutralizes acidic sites and facilitates faster polycondensation, thereby reducing imprinting time and improving the predictability of the polycondensation reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polycondensable imprinting composition is applied directly to the substrate surface, then the imprinting process can proceed, but the acidic sites on the substrate surface retard the polycondensation reaction, leading to prolonged imprinting times and compromised patterned layer properties
Solution Approach 1:
The patent applies a preliminary treatment step where a base compound (such as ammonia, amine, or metal oxide) is applied to the substrate surface before applying the polycondensable imprinting composition. This preliminary action neutralizes the acidic sites on the substrate surface, removing the retarding effect that would otherwise slow down the polycondensation reaction. As a result, the imprinting time is reduced and the patterned layer properties are improved without requiring changes to the core imprinting process.
2Productivity
If the substrate surface chemistry is left unchanged, then the process remains simple, but the acidic sites cause prolonged imprinting times and reduced patterned layer quality
Solution Approach 1:
The patent introduces a base compound as an intermediary substance between the substrate surface and the polycondensable imprinting composition. This intermediary neutralizes the acidic sites on the substrate surface, creating a more favorable environment for the polycondensation reaction. The base compound acts as a mediator that facilitates faster reaction kinetics without requiring fundamental changes to the substrate or the imprinting composition, thus improving productivity while adding only a single straightforward treatment step.
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 allows for the formation of patterned layers with shorter imprinting times and enhanced properties by decoupling the substrate's surface chemistry from the polycondensation process, improving the adhesion and stability of the patterned layers.
Implementation Method 1
the compound comprises at least one condensable group reactive with surface groups of the surface by condensation reaction, and a basic group for accepting protons
Implementation Method 2
the compound comprises at least one condensable group reactive with surface groups of the surface by condensation reaction
Implementation Method 3
polycondensation of the imprinting composition taking place during the imprinting thereby to form the patterned layer
Data Source
AI summary
Provided is a method of providing a patterned layer (50). The method comprises providing (2, 3A, 3B) a substrate (10) having a surface (11) to which a compound is applied. The compound has at least one condensable group which is reactive with surface groups on the surface of the substrate by condensation reaction. The compound also has a basic group for accepting protons. A layer of a polycondensable imprinting composition (30) is applied (4) onto the layer of the compound. The imprinting composition layer is imprinted (5A, 5B, 5C) with a patterned stamp. During the imprinting, polycondensation of the imprinting composition leads to forming of the patterned layer. Further provided is the patterned layer itself, as well as an optical element and an etch mask, each of which comprises the patterned layer.