Layered Metal Oxide Field Effect Electrode for Flexible Displays
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Solution Overview
Problem
Current transparent conductive electrode materials, such as ITO, face challenges due to indium scarcity, high production costs, and poor mechanical properties, which limit their application in flexible devices and affect light transmittance and conductivity.
Innovation Solution
A layered metal oxide field effect electrode comprising multiple metal strips and thin layered metal oxide films with specific band gap widths and thicknesses, including a first and third thin metal oxide film with band gaps less than 3 eV and a second thin metal oxide film with a band gap greater than 3 eV, enhancing carrier mobility and light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thin metal film is used as transparent conductive electrode, then electrical conductivity is improved, but light transmittance deteriorates due to scattering from island-like structure
Solution Approach 1:
The patent uses a composite structure combining thin metal film (3-15 nm) with transparent metal oxide films (SnO2, ZnO, In2O3, etc.) to create a transparent conductive electrode. The metal film provides electrical conductivity while the metal oxide layers fill the gaps between metal islands and reduce light scattering, achieving both high conductivity and high light transmittance (>85% at 550 nm).
2Reliability
If pure metal is used as thin transparent conductive film, then electrical resistance is reduced, but mechanical strength and flexibility deteriorate
Solution Approach 1:
The patent creates a composite structure where thin metal film (providing low electrical resistance) is combined with transparent metal oxide films (SnO2, ZnO, In2O3, GaO, etc.). The metal oxide layers provide mechanical strength and flexibility while the metal film maintains low electrical resistance. This composite approach enables the electrode to be applied in flexible devices.
3Reliability
If ITO is used as transparent conductive electrode, then light transmittance and electrical conductivity are improved, but material cost and production complexity increase due to indium scarcity
Solution Approach 1:
The patent changes the material composition parameters by using alternative transparent metal oxides (SnO2, ZnO, In2O3, GaO, Cu2O, etc.) either as replacements or in combination with thin metal films. This substitution reduces dependence on expensive indium while maintaining high light transmittance (>85% at 550 nm) and electrical conductivity, thereby reducing production costs and material scarcity issues.
4Strength
If thin metal oxide film is used to improve mechanical properties, then flexibility is improved, but light transmittance and conductive properties deteriorate
Solution Approach 1:
The patent creates a composite structure where transparent metal oxide films (SnO2, ZnO, In2O3, etc.) are combined with thin metal films (3-15 nm). The metal oxide films provide mechanical strength and flexibility, while the thin metal layer maintains high electrical conductivity and light transmittance. The synergistic combination ensures the electrode achieves >85% light transmittance at 550 nm while possessing good mechanical properties for flexible applications.
Data Source
AI summary
A layered metal oxide field effect electrode includes multiple metal strips and layered metal oxide films. The band gap width of the first thin metal oxide film material is less than 3 eV; the band gap width of the second thin metal oxide film material is greater than 3 eV; the band gap width of the third thin metal oxide film material is less than 3 eV; the difference between the band gap width of the second thin metal oxide film material and the band gap width of the first thin metal oxide film material is greater than 1 eV; the difference between the band gap width of the second thin metal oxide film material and the band gap width of the third thin metal oxide film material is greater than 1 eV; and the thicknesses of the first thin metal oxide film, the second thin metal oxide film, and the third thin metal oxide film are each smaller than or equal to 10 nm. The layered metal oxide field effect electrode has the advantages of high light transmittance and a good field conduction performance.