Electrochromic Window Edge Treatment for Charge Buildup
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Solution Overview
Problem
Electrochromic devices, particularly electrochromic windows, face issues such as unwanted coloration and charge buildup due to edge defects and isolation scribes, limiting their commercial potential despite advancements in electrochromic technology.
Innovation Solution
The development of thin-film devices with novel optical configurations, including edge treatments and bus bar exposure methods, which eliminate the need for isolation scribes and reduce charge buildup by selectively removing conductor layers and diffusion barriers, ensuring proper electrical contact and uniform coloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isolation scribes are used to address edge defects, then device reliability is improved, but unwanted coloration and charge buildup occur due to edge effects
Solution Approach 1:
The patent removes the isolation scribe structure entirely and extracts the problematic edge region by creating a perimeter area free of conductor layers. This eliminates the source of charge buildup and unwanted coloration while maintaining device reliability through alternative edge treatment methods.
Solution Approach 2:
Instead of adding isolation scribes to prevent edge effects, the patent inverts the approach by deliberately creating edge-free perimeter areas where conductor layers are removed. This reverses the conventional wisdom of isolating edge regions and instead embraces edge elimination to prevent harmful effects.
2Area of stationary object
If conductor layers are extended to substrate edges, then device area is maximized, but edge defects cause charge buildup and unwanted coloration
Solution Approach 1:
The patent extracts conductor layers from the perimeter regions of the substrate, creating designated edge-free zones. This removes the source of edge defects and charge buildup while maintaining maximum active device area in the central region.
Solution Approach 2:
The patent applies different structural qualities to different regions: the central region maintains full conductor layer coverage for maximum active area, while perimeter regions are cleared of conductor layers to eliminate edge defects. This local differentiation optimizes both area utilization and defect prevention.
3Reliability
If bus bars are applied to exposed conductor areas, then electrical contact is improved, but conductor layer removal creates additional edge exposure
Solution Approach 1:
The patent applies bus bars selectively to specific exposed conductor areas that are optimized for electrical contact while avoiding regions that would create additional edge exposure. This localized application ensures good electrical connectivity without introducing new edge-related problems.
Solution Approach 2:
The patent performs preliminary conductor layer removal and bus bar application in a controlled sequence during fabrication. By preparing the substrate with appropriate exposed areas before final assembly, the patent ensures optimal electrical contact while preventing subsequent edge exposure issues.
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
These methods result in more robust and better-performing electrochromic devices with reduced edge defects, improved electrical contact, and uniform coloration, enhancing their energy-saving capabilities and commercial viability.
Implementation Method 1
The first transparent conducting oxide layer has a sheet resistance of less than 100 ohms per square and functions to conduct electricity from a surface of the substrate across the electrochromic device stack to the second transparent conducting oxide layer
Implementation Method 2
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.
Data Source
AI summary
Thin-film devices, for example electrochromic devices for windows, and methods of manufacturing are described. Particular focus is given to methods of patterning optical devices. Various edge deletion and isolation scribes are performed, for example, to ensure the optical device has appropriate isolation from any edge defects. Methods described herein apply to any thin-film device having one or more material layers sandwiched between two thin film electrical conductor layers. The described methods create novel optical device configurations.