Transparent Conductive Film Crystallization on Polymer Substrates
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Solution Overview
Problem
The challenge is to manufacture a transparent conductive film with low resistivity and high transmittance on a polymer substrate, as conventional methods require high-temperature processing that causes substrate deformation and discoloration, making it difficult to achieve both low resistance and high translucency in a wide wavelength range.
Innovation Solution
A conductive member is created using a polymer substrate with a transparent conductive film formed by crystallizing indium oxide through light radiation, which promotes crystallization without the need for high-temperature treatment, resulting in a film with high carrier mobility and improved transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature processing is used to form transparent conductive film, then low resistivity and high carrier mobility are achieved, but polymer substrate deforms and discolors
Solution Approach 1:
The patent replaces thermal energy (heat treatment) with light energy (laser irradiation) to achieve crystallization of the transparent conductive film. This substitution allows crystallization to occur without heating the polymer substrate to high temperatures, thereby avoiding substrate deformation and discoloration while still achieving low resistivity and high carrier mobility in the conductive film
Solution Approach 2:
The patent changes the energy input parameter from thermal (temperature) to optical (light intensity and wavelength). By using laser irradiation with specific parameters (wavelength, intensity, duration), the patent achieves crystallization at conditions that do not degrade the polymer substrate, thus resolving the contradiction between achieving high carrier mobility and preventing substrate damage
2Reliability
If high-temperature processing is used to form transparent conductive film, then low resistivity is achieved, but substrate transmittance deteriorates
Solution Approach 1:
The patent substitutes thermal processing with optical processing using laser irradiation. This allows the transparent conductive film to be crystallized and achieve low resistivity without subjecting the polymer substrate to high temperatures that would cause discoloration and reduce light transmittance, thereby maintaining both electrical conductivity and optical transparency
3Reliability
If crystallization is promoted by heating, then carrier mobility increases, but substrate heat resistance is exceeded
Solution Approach 1:
The patent replaces the thermal field with an optical field to promote crystallization. By using laser irradiation, energy is directly delivered to the transparent conductive film material, causing crystallization and increasing carrier mobility without raising the overall substrate temperature to levels that would exceed the polymer substrate's heat resistance
Solution Approach 2:
The patent applies energy locally to the transparent conductive film rather than heating the entire substrate uniformly. The laser irradiation is focused on the conductive film layer, inducing crystallization only where needed, while the polymer substrate remains below its degradation temperature, thus achieving high carrier mobility without exceeding substrate temperature limits
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 production of a conductive member with low resistivity and high light transmittance, enhancing energy efficiency in photoelectric conversion elements and enabling flexible, lightweight devices, while avoiding substrate deterioration.
Implementation Method 1
the transparent conductive film contains indium oxide crystallized and crystal-grown by light radiation
Data Source
AI summary
A conductive member includes a substrate and a transparent conductive film formed on the substrate, the substrate is a non-heat-resistant substrate, the transparent conductive film contains crystalline particles containing indium oxide, and the mobility of carrier electrons is 70 cm2/V·s or more.