Multilayer Superstrate for Ultra-Smooth Planarization Surfaces
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Solution Overview
Problem
Existing superstrates used in ink-jet-based adaptive planarization often have imperfectly planar contact surfaces, leading to suboptimal surface roughness and nanotopography, which can hinder the formation of a perfectly planarized layer.
Innovation Solution
A superstrate configuration is proposed, comprising a body, a first layer with a proximal and distal surface, and a second layer with improved surface roughness and nanotopography, where the body is closer to the proximal surface of each layer, and the arithmetic average surface roughness (Ra) of the distal surface of the second layer is less than that of the first layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer superstrate configuration is used, then the device complexity is reduced, but the surface roughness and nanotopography of the contact surface deteriorate
Solution Approach 1:
The superstrate is divided into multiple layers (first layer, second layer, and optionally third layer) with different functions. The first layer provides structural support, the second layer provides the planar contact surface, and the third layer (if present) provides release functionality. This segmentation allows each layer to be optimized for its specific function, achieving low surface roughness without excessive complexity.
Solution Approach 2:
The superstrate uses composite material structure with layers made of different materials having complementary properties. The combination of materials allows achieving both mechanical strength and ultra-smooth surface finish that would be difficult to obtain with a single material.
2Manufacturing precision
If multiple layers are added to improve surface roughness, then the manufacturing precision improves, but the device complexity increases
Solution Approach 1:
The second layer is specifically designed with local quality focused on providing an ultra-smooth distal surface (Ra ≤ 0.20 nm) for contact with the planarization layer precursor, while other layers have different optimized properties for their respective functions.
Solution Approach 2:
The patent transitions from a single-layer to a multi-layer structure, adding the dimension of layering to solve the surface roughness problem. This dimensional change allows achieving the required Ra ≤ 0.20 nm through the cumulative effect of multiple layers rather than relying on a single layer.
3Stability of the object's composition
If the body is positioned closer to the proximal surface of each layer, then the structural stability is improved, but the surface planarity of the distal surface deteriorates
Solution Approach 1:
By segmenting the superstrate into multiple layers, the patent decouples the structural support function (handled by the body and first layer) from the surface planarity function (handled by the second layer). This allows the body to be positioned for stability while the second layer independently provides the required surface quality.
Solution Approach 2:
The second layer acts as an intermediary between the body/first layer and the planarization layer precursor. It mediates the contradiction by providing a smooth contact surface while allowing the body to maintain its optimal position for structural stability.
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 configuration significantly improves the surface roughness and nanotopography of the contact surface of the superstrate, achieving a Ra of at most 0.20 nm and nanotopography of at most 5.9 nm on a 2 mm lateral scale, thereby enhancing the planarity and performance of the planarized layer.
Implementation Method 1
The second layer can include an oxide, a nitride, an oxynitride, or a fluoropolymer
Implementation Method 2
The first layer includes spin-on carbon, a polymer, a chemical or physical vapor deposited carbon film
Implementation Method 3
The third layer includes a polymerizable compound
Data Source
AI summary
A superstrate can include a body, a first layer, and a second layer, wherein the first layer is disposed between the body and the second layer. Each of the first and second layers has a proximal surface and a distal surface opposite the proximal surface, wherein the body is closer to the proximal surface than to the distal surface. An Ra of the distal surface of the second layer is less than an Ra of the distal surface of the first layer. In a method of making the superstrate, the relatively high Ra of the distal surface of the first layer may be related to the process or equipment used in forming the first layer. The second layer can be formed using another superstrate, where the Ra of the distal surface of the second layer is substantially the same as the contact surface of the other superstrate.