CNT Pattern Wiring Structure for Transparent Low-Resistance Heaters
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Solution Overview
Problem
Existing CNT wiring technologies face challenges in achieving both low resistance and high light transmittance due to the inherent relationship between sheet resistance and light transmittance, making it difficult to form CNT conductive films that are both conductive and transparent.
Innovation Solution
The CNT pattern wiring features a line-and-space configuration with CNT lines having a height of 1 μm or more, alternating with openings, allowing for high light transmittance while reducing sheet resistance by setting the formation ratio of the opening to 90% or more and optimizing the width and height of the CNT lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a CNT conductive film is formed to reduce sheet resistance, then electrical conductivity is improved, but light transmittance deteriorates
Solution Approach 1:
The invention transitions from a two-dimensional CNT film to a three-dimensional line-and-space structure with CNT lines having height of 1 μm or more. This vertical dimension allows light to pass through the openings between lines while maintaining conductive pathways along the CNT lines, thereby achieving both low sheet resistance and high light transmittance simultaneously
Solution Approach 2:
The CNT lines are arranged in a line-and-space pattern where different regions have different functions: the CNT lines provide electrical conductivity while the openings between lines allow light transmission. This spatial differentiation of properties enables simultaneous optimization of both electrical and optical characteristics
2Illumination intensity
If the formation ratio of openings is increased to improve light transmittance, then transparency is improved, but sheet resistance increases
Solution Approach 1:
By introducing the height dimension (1 μm or more) and creating a line-and-space three-dimensional structure, the invention enables high light transmittance through openings while maintaining low sheet resistance through the vertical conductive pathways of the CNT lines, breaking the traditional inverse relationship between these parameters
3Illumination intensity
If CNT lines are made thinner to improve transparency, then light transmittance is improved, but electrical conductivity deteriorates
Solution Approach 1:
The invention compensates for reduced CNT line width by increasing the height to 1 μm or more, creating a three-dimensional structure where the vertical dimension provides sufficient conductive cross-section for low resistance while the reduced horizontal width allows higher light transmittance through the openings
Data Source
AI summary
The wiring includes a substrate having one surface and a CNT pattern having multiple CNT lines which are made of a line-shape CNT on the surface and have a height of 1 μm or more. In the cross section taken along one direction on the one surface, the CNT pattern wiring is a line-and-space film in which the opening is located between the plurality of adjacent CNT lines.