P-Type Metal Oxide Barrier Layer for Longer-Life Organic Electronics
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Solution Overview
Problem
Organic electronic devices suffer from poor gas barrier properties and short lifespan due to the use of organic materials, leading to degradation from environmental factors such as heat, moisture, and gases, which affects devices like electrophotographic photoconductors, dye-sensitized solar cells, and organic EL devices.
Innovation Solution
A laminated structure is formed using a silicone-containing layer and a metal oxide film with p-type semiconductivity, specifically delafossite-type metal oxides, to enhance adhesion and density, improving gas barrier properties and device durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If organic materials are used in electronic devices, then ease of manufacture and cost are improved, but gas barrier property and lifespan deteriorate
Solution Approach 1:
The invention uses composite materials by combining organic materials with inorganic metal oxide particles (having p-type semiconductivity) to create a hybrid structure. The metal oxide particles are dispersed in the organic binder resin, forming a protective layer that provides both the manufacturability of organic materials and the gas barrier properties of inorganic materials, thereby resolving the contradiction between ease of manufacture and gas barrier property.
Solution Approach 2:
The invention applies local quality by creating a specific protective layer with metal oxide particles at the surface or interface where gas barrier protection is most needed. This layer is formed by coating or laminating metal oxide-containing composition onto the organic electronic device, providing localized enhancement of gas barrier properties without requiring the entire device to be made of inorganic materials.
2Ease of manufacture
If organic materials are used in electronic devices, then ease of manufacture is improved, but lifespan deteriorates due to degradation from heat, moisture, and gases
Solution Approach 1:
The composite structure of organic binder resin with dispersed metal oxide particles creates a protective barrier that extends device lifespan. The inorganic metal oxide particles provide resistance to heat, moisture, and gas degradation while the organic binder maintains ease of manufacture, thus resolving the contradiction between ease of manufacture and lifespan.
Solution Approach 2:
The invention applies beforehand cushioning by pre-forming a protective layer containing metal oxide particles on the organic electronic device before exposure to harsh environmental conditions. This protective layer acts as a barrier that cushions the device against degradation from heat, moisture, and gases, extending lifespan while maintaining the ease of manufacture of organic materials.
3Reliability
If a protective layer with metal oxide particles is formed, then gas barrier property and wear resistance are improved, but device complexity increases
Solution Approach 1:
The invention applies segmentation by dividing the protective function into a separate, distinct layer containing metal oxide particles that is coated or laminated onto the organic electronic device. This segmented approach allows the protective layer to be manufactured and applied independently, simplifying the overall manufacturing process while providing enhanced gas barrier properties, thus resolving the contradiction between gas barrier property and device complexity.
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
The laminated structure enhances the lifespan and durability of electronic devices by providing improved resistance to environmental factors, maintaining high-quality image and photoelectric conversion performance.
Implementation Method 1
organic electronic devices have a drawback that their lifespan is shorter than that of inorganic electronic devices. One of the causes is that a gas barrier property derived from the organic materials contained in the organic electronic devices is poor
Implementation Method 2
A laminated structure is formed using a silicone-containing layer and a metal oxide film with p-type semiconductivity, specifically delafossite-type metal oxides, to enhance adhesion and density
Data Source
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AI summary
Metal oxide particles having p-type semiconductivity are provided. The metal oxide particles have a volume-based particle size distribution having a first local maximum value and a second local maximum value. The first local maximum value is in a range of 0.1 µm or more and less than 5 µm and the second local maximum value is in a range of 5 µm or more and less than 50 µm. A ratio of the second local maximum value to the first local maximum value is 0.5 or more and less than 2.0, and 99% by volume or more of the metal oxide particles have a particle diameter in a range of from 0.1 to 50 µm.