Solid-State Electrochromic Interface Without a Separate IC Layer
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Solution Overview
Problem
Conventional electrochromic devices require a separate ionically conducting layer, which complicates fabrication and can lead to defects, limiting their performance and commercial potential.
Innovation Solution
The electrochromic device is fabricated without a separate ionically conducting layer by forming an interfacial region between the electrochromic and counter electrodes, which serves as both ionically conductive and electronically insulating, allowing for direct contact between the electrodes and simplifying the fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate ionically conducting layer is deposited between the electrochromic electrode and counter electrode, then electronic insulation is achieved, but device complexity and fabrication difficulty increase
Solution Approach 1:
The patent combines the counter electrode layer and electrochromic electrode layer into direct contact, eliminating the separate ionically conducting layer. The counter electrode layer itself is designed to provide both ion conduction and electronic insulation functions, merging multiple functions into a single component structure.
Solution Approach 2:
The counter electrode layer is designed to serve multiple functions simultaneously: it acts as the counter electrode for electrochromic operation, provides ionic conduction pathway, and provides electronic insulation between the electrochromic electrode and counter electrode. This multi-functional design eliminates the need for a separate ionically conducting layer.
2Reliability
If a separate ionically conducting layer is deposited, then ion conduction is enabled, but fabrication process complexity increases
Solution Approach 1:
The patent merges the ion conduction function into the counter electrode layer structure itself. The counter electrode layer is fabricated with specific material composition and microstructure that enables ionic conduction while maintaining its primary function as an electrode, thereby eliminating the need for an additional deposition process for a separate ionically conducting layer.
Solution Approach 2:
The patent extracts the ion conduction function from a separate layer and integrates it directly into the counter electrode layer. By designing the counter electrode with appropriate material properties and microstructure, the dedicated ionically conducting layer is removed while maintaining necessary ion conduction pathways.
3Device complexity
If an interfacial region is formed between directly contacting electrodes, then fabrication complexity is reduced, but ensuring proper ion conduction and electronic insulation becomes challenging
Solution Approach 1:
The patent applies local quality by creating a specific interfacial region at the contact between counter electrode and electrochromic electrode layers. This interface is engineered with particular material composition, microstructure, and thickness characteristics that differ from the bulk layers, providing optimized local properties for simultaneous ion conduction and electronic insulation.
Solution Approach 2:
The interfacial region employs composite material structures combining different phases or compositions that work together to provide both ion conduction and electronic insulation. The interface may contain a mixture of materials with complementary properties, creating a composite structure that achieves the dual functionality required at the electrode contact region.
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 reduces fabrication complexity, improves device performance, and enhances reliability by eliminating the need for additional processing steps while maintaining effective ion conduction and electronic insulation.
Implementation Method 1
the interfacial region serves at least some functions of an ionically conductive electronically insulating layer in conventional devices
Implementation Method 2
the interfacial region serves at least some functions of an ionically conductive electronically insulating layer in conventional devices
Implementation Method 3
Electrochromism is a phenomenon in which a material exhibits a reversible electrochemically-mediated change in an optical property when placed in a different electronic state
Implementation Method 4
Tungsten oxide is a cathodic electrochromic material in which a coloration transition, transparent to blue, occurs by electrochemical reduction
Data Source
AI summary
Conventional electrochromic devices frequently suffer from poor reliability and poor performance. Improvements are made using entirely solid and inorganic materials. Electrochromic devices are fabricated by forming an ion conducting electronically insulating interfacial region that serves as an IC layer. In some methods, the interfacial region is formed after formation of an electrochromic and a counter electrode layer, which are in direct contact with one another. The interfacial region contains an ion conducting electronically insulating material along with components of the electrochromic and/or the counter electrode layer. Materials and microstructure of the electrochromic devices provide improvements in performance and reliability over conventional devices. In addition to the improved electrochromic devices and methods for fabrication, integrated deposition systems for forming such improved devices are also disclosed.