Electrochromic Element IMI Transparent Electrode Reflectivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrochromic elements face challenges in achieving high reflectivity, cost-effectiveness, and uniform darkening, particularly due to high sheet resistance in transparent electrodes, which affects the performance and durability of electrochromic mirrors and windows.
Innovation Solution
The development of an electrochromic element with a transparent electrode layer comprising an insulator/metal/insulator stack, using materials like indium tin oxide, indium zinc oxide, and silver, which reduces sheet resistance and enhances reflectivity, stability, and manufacturing ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional transparent conductive coatings are used in electrochromic elements, then manufacturing is simpler, but sheet resistance is high which reduces reflectivity and darkening uniformity
Solution Approach 1:
The patent applies composite materials by combining insulator layers with metal layers to form an IMI stack structure. This composite electrode design achieves low sheet resistance (improving reflectivity and darkening uniformity) while maintaining transparency. The specific composite structure of alternating insulator and metal layers allows optical transparency while providing excellent electrical conductivity, resolving the contradiction between reliability and device complexity.
2Manufacturing precision
If high sheet resistance transparent electrodes are used, then manufacturing is easier, but darkening uniformity is poor
Solution Approach 1:
The patent applies segmentation by dividing the transparent electrode into multiple discrete layers (insulator-metal-insulator stack) rather than using a single continuous layer. This segmented structure allows each layer to be optimized independently for its specific function (insulation vs. conductivity), achieving uniform darkening across the electrochromic element while maintaining manufacturing feasibility through standardized layer deposition processes.
3Illumination intensity
If complex electrode structures are used to reduce sheet resistance, then reflectivity improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by systematically varying the thickness, material composition, and layer configuration of the IMI stack to optimize reflectivity while controlling manufacturing complexity. By adjusting parameters such as metal layer thickness and insulator material selection, the patent achieves high reflectivity with a structured approach that remains manufacturable through established thin-film deposition techniques.
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 solution achieves a high color rendering index, improved reflectivity, and faster, more uniform darkening, while reducing overall costs and manufacturing complexity, thus addressing the limitations of previous electrochromic technologies.
Implementation Method 1
an electrochromic medium located between the first and second substrates, wherein the electrochromic medium has a light transmittance that is variable upon the application of an electric field thereto
Implementation Method 2
the transparent electrode layer comprises a first insulator layer, at least one metal layer, and a second insulator layer
Implementation Method 3
enhances reflectivity
Data Source
AI summary
An electrochromic element comprises a first substrate having a first surface and a second surface opposite the first surface, a second substrate in spaced-apart relationship to the first substrate and having a third surface facing the second surface and a fourth surface opposite the third surface, and an electrochromic medium located between the first and second substrates, wherein the electrochromic medium has a light transmittance that is variable upon application of an electric field thereto. The electrochromic element further comprises a transparent electrode layer covering at least a portion of at least a select one of the first surface, the second surface, the third surface, and the fourth surface, wherein the transparent electrode layer comprises an insulator/metal/insulator stack. The materials utilized to construct the insulator/metal/insulator stack are selected to optimize optical and physical properties of the electrochromic element such as reflectivity, color, electrical switch stability, and environmental durability.