SnO2 Transparent Electrode Structure for Durable Outer-Surface Sensing
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Solution Overview
Problem
Conventional transparent electrodes used in wearable devices lack physical and chemical durability, limiting their placement to inner surfaces and reducing design freedom due to opacity, which restricts the integration of electrical and optical measurement units in limited device spaces.
Innovation Solution
A novel transparent electrode is developed with a conductive layer and a transparent electrode layer containing SnO2, combined with a current collector, which provides physical and chemical durability while maintaining transparency, allowing placement on the outer surface of devices and enabling the integration of both measurement units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional transparent electrodes (ITO) are used, then light transparency is maintained, but physical and chemical durability is insufficient for outer surface placement
Solution Approach 1:
The patent employs a composite electrode structure consisting of multiple layers: a base transparent electrode layer (ITO), an intermediate adhesive layer, and an outer protective layer. This composite construction combines the transparency of ITO with the durability and environmental resistance of the protective outer layer, enabling the electrode to withstand outdoor conditions while maintaining optical properties.
Solution Approach 2:
The patent utilizes thin film technology to create a multi-layer coating structure that is both transparent and durable. The protective outer layer is applied as a thin film that maintains optical transparency while providing mechanical strength and chemical resistance, allowing the electrode to be placed on outer surfaces without compromising durability.
2Reliability
If metal electrodes are used for electrical measurement, then conductivity is improved, but optical transparency is lost
Solution Approach 1:
The patent creates a composite electrode system where transparent conducting oxide (TCO) materials serve as the primary conductive layer. These TCO layers provide sufficient electrical conductivity for measurement functions while maintaining high optical transparency, eliminating the need for opaque metal electrodes in visible light applications.
Solution Approach 2:
The patent optimizes the thickness and composition of the transparent electrode layers to achieve the right balance between electrical conductivity and optical transparency. By carefully controlling the film thickness and material composition, the electrode provides adequate conductivity for electrical measurements while remaining transparent to visible and near-infrared light for optical measurements.
3Reliability
If transparent electrode is placed in closed space, then durability is improved, but design freedom is reduced
Solution Approach 1:
The patent develops a flexible, thin-film protective coating that can be applied to transparent electrodes intended for outer surface placement. This protective layer is engineered to be both mechanically robust and optically transparent, allowing the electrode to withstand environmental exposure while maintaining design flexibility for various wearable device configurations.
Data Source
AI summary
A transparent electrode disposed on the insulating substrate, the conductive layer including at least one of a metal layer or a metal oxide layer, a transparent electrode layer including SnO2 as a main component; and a current collector on at least a portion of a side surface of the transparent electrode layer, the current collector being electrically connected to the transparent electrode layer and the conductive layer.