Electrochromic Layer Structure Nanoparticle Conductive Tracks
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Solution Overview
Problem
Electrochromic glazings in vehicles and aircraft require rapid changes in transparency, but existing technologies face challenges due to low electrical conductivity of electrodes, leading to slow tint transitions, and high-temperature processing methods that can damage sensitive active layers.
Innovation Solution
An electrochromic layer structure with nanoparticles forming conductive tracks between electrodes, reducing process temperatures and enabling quick charge carrier exchange, combined with protective layers and flexible production methods for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional electrodes with low electrical conductivity are used, then the structure is simple, but the tint transition speed is slow
Solution Approach 1:
The electrode is segmented into a network of conductor tracks formed by nanoparticles arranged in specific patterns (grid, honeycomb, radial, etc.), replacing conventional continuous electrode structures. This segmentation increases electrical conductivity along charge carrier transport paths while maintaining optical transparency in non-conductive areas, thereby accelerating tint transition speed without excessive complexity
Solution Approach 2:
The nanoparticle conductor tracks are strategically positioned in specific geometric patterns (e.g., radial patterns from center to edge, grid patterns, honeycomb structures) to optimize charge carrier transport paths locally. This local optimization of conductivity distribution enables faster tint transition while maintaining overall structural simplicity and optical clarity
2Reliability
If conductive paste with silver particles and gas frits is used to increase conductivity, then electrical conductivity improves, but high process temperatures are required that damage the active layer
Solution Approach 1:
The patent uses nanoparticles (such as metal oxides, conductive polymers, or carbon-based materials) that can be deposited and stabilized at low temperatures, replacing conventional conductive pastes requiring high-temperature sintering. These nanoparticle-based conductors achieve sufficient conductivity without subjecting the temperature-sensitive active layer to damaging thermal processing
Solution Approach 2:
The invention changes the material parameters of the conductor from conventional paste materials (silver particles with glass frit binders requiring sintering) to nanoparticle materials that can be processed at low temperatures. This parameter change in material composition and processing temperature enables conductivity enhancement while protecting the active layer from thermal damage
3Reliability
If metal wires are used to form conductive networks, then electrical conductivity is sufficient, but material usage is excessive
Solution Approach 1:
The conductor is formed as a nanoparticle network with inherent porosity and open structure, allowing charge carrier transport through interconnected particle pathways rather than requiring solid metal wire cross-sections. This porous nanoparticle network achieves equivalent or superior conductivity with dramatically reduced metal material consumption compared to solid wire implementations
Solution Approach 2:
The invention employs composite conductor structures where nanoparticles (metallic, ceramic, or polymeric) are combined with binder materials or arranged in geometric patterns to create efficient conductive networks. These composite nanoparticle-based conductors achieve target conductivity levels with minimal material usage, replacing bulk metal wire with optimized nanoparticle assemblies
4Ease of manufacture
If the active layer is exposed to high temperatures for paste stabilization, then the conductive network is formed, but the active layer is attacked and degraded
Solution Approach 1:
The patent employs nanoparticles that can be deposited as suspensions or pastes and then stabilized through low-temperature processing (drying, mild heating, or chemical crosslinking) rather than high-temperature sintering. This approach allows easy formation of conductive networks while preserving the integrity of the temperature-sensitive active layer
Solution Approach 2:
The nanoparticle conductor formulation includes binder materials, dispersants, or protective coatings that act as intermediaries, enabling the conductor to be applied and stabilized at low temperatures without direct thermal exposure of the active layer. These intermediary materials facilitate low-temperature processing while ensuring proper adhesion and conductivity of the nanoparticle network
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 allows for rapid and efficient transparency changes in electrochromic glazings, suitable for vehicles and aircraft, while protecting the active layer from environmental influences and reducing material usage.
Implementation Method 1
When a current flows, an exchange of charge carriers occurs and the electrochromic layer changes its permeability to sunlight
Implementation Method 2
The electrochromic material changes its transmission properties for electromagnetic radiation by changing its oxidation state
Implementation Method 3
at least one of the electrodes has an electrically conductive network of conductor tracks, and the conductor tracks contain nanoparticles
Data Source
AI summary
An electrochromic layer structure with at least one active layer and at least two electrodes is described. At least one of the electrodes has an electrically conductive network of conductor tracks and the conductor tracks contain nanoparticles. An electrochromic device, a method for production of an electrochromic layer structure and use of an electrochromic layer structure and an electrochromic device are also described.