Electrochromic Devices Solid-State Interfacial Layer
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Solution Overview
Problem
Conventional electrochromic devices require a separate ionically conductive and electronically insulating layer, which complicates the fabrication process and reduces the quality of the devices due to defects from liquid-based processes like sol gel, and the deposited IC layers are prone to removal by scribing.
Innovation Solution
The electrochromic and counter electrode layers are formed in direct contact without a separately deposited ionically conductive layer, with an interfacial region serving as the ionically conductive and electronically insulating layer, formed through mechanisms such as lithiation or heat treatment, allowing for a single layer graded composition that functions as both an electrochromic and ionically conductive layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate ionically conductive layer is deposited between electrochromic and counter electrode layers, then electronic insulation is achieved, but device complexity increases and manufacturing precision decreases due to defects from liquid-based processes
Solution Approach 1:
The patent merges the electrochromic layer and ionically conductive layer into a single integrated layer. The electrochromic layer is designed to inherently possess both electrochromic functionality and ionic conductivity, eliminating the need for a separate ionically conductive layer while maintaining electronic insulation through proper material selection and interface design.
Solution Approach 2:
The electrochromic layer is赋予 multiple functions: it serves as both the electrochromic active layer and the ionically conductive layer. By selecting materials and designing the layer structure appropriately, the single layer performs multiple roles that were previously distributed across separate layers, thereby reducing device complexity.
2Reliability
If a separate ionically conductive layer is deposited, then ionic conductivity is ensured, but manufacturing precision deteriorates due to defects from sol gel and scribing processes
Solution Approach 1:
The patent combines the electrochromic and ionically conductive functions into one layer, eliminating the separate ionically conductive layer that requires sol gel processing and scribing. This integration removes the sources of manufacturing defects associated with liquid-based processes while maintaining the necessary ionic conductivity through the electrochromic layer's inherent properties.
3Ease of manufacture
If electrochromic and counter electrode layers are formed in direct contact, then fabrication is simplified, but electronic shorting may occur between layers
Solution Approach 1:
The patent merges the electrochromic and ionically conductive layers into a single layer, allowing the electrochromic layer to be in direct contact with the counter electrode layer without requiring a separate ionically conductive layer. The electronic insulation is maintained through the inherent properties of the integrated layer and proper interface design.
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 simplifies the fabrication process, reduces defects, and improves the performance and reliability of electrochromic devices by eliminating the need for additional processing steps and enhancing electrochromic transitions and thermal cycling stability.
Implementation Method 1
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, typically by being subjected to a voltage change. The optical property is typically one or more of color, transmittance, absorbance, and reflectance.
Implementation Method 2
the ionically conductive layer permits transport of ions but blocks electronic current. As conventionally understood, the ionically conductive layer therefore prevents shorting between the electrochromic layer and the counter electrode layer.
Implementation Method 3
with an interfacial region serving as the ionically conductive and electronically insulating layer, formed through mechanisms such as lithiation or heat treatment
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. 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.