Thin-Film Electrochromic Window Patterning for Edge Isolation
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Solution Overview
Problem
Electrochromic devices, particularly electrochromic windows, suffer from issues such as unwanted coloration and charge buildup in non-viewable areas, leading to defects and performance problems, and current fabrication methods are complex and inefficient.
Innovation Solution
The fabrication methods involve edge deletion and isolation scribes to ensure proper isolation and avoid charge buildup, with edge treatments like tapering and selective removal of conductor layers to eliminate the need for traditional laser isolation scribes, resulting in robust and efficient optical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional laser isolation scribes are used to prevent charge buildup and unwanted coloration, then device reliability is improved, but manufacturing complexity and process time increase
Solution Approach 1:
The patent extracts and removes the need for laser isolation scribes by designing the conductor layer pattern itself to provide natural isolation. The conductor layer is patterned with gaps and isolation regions that eliminate charge buildup without requiring additional laser scribing steps, thus maintaining reliability while reducing manufacturing complexity.
Solution Approach 2:
The isolation structures are built into the conductor layer pattern during the initial deposition process rather than being added later through laser scribing. The conductor layer is deposited with pre-planned gaps and isolation regions that prevent charge buildup from the start, eliminating the need for subsequent isolation scribe steps.
2Reliability
If multiple isolation scribes are performed during fabrication, then unwanted coloration and charge buildup are reduced, but manufacturing time and process steps increase
Solution Approach 1:
The patent merges the isolation function with the conductor layer pattern design itself. The conductor layer is patterned to include isolation regions and gaps that perform the isolation function inherently, combining what were previously separate functions (conductor patterning and isolation scribing) into a single deposition process step.
Solution Approach 2:
Isolation structures are pre-integrated into the conductor layer pattern during the deposition process, eliminating the need for multiple subsequent laser scribe steps. The conductor layer is deposited with built-in isolation features that prevent charge buildup without requiring additional manufacturing steps.
3Area of stationary object
If conductor layers are extended to substrate edges, then device area is maximized, but edge defects and charge buildup increase
Solution Approach 1:
The patent applies different properties to different regions of the conductor layer. The central regions have continuous conductor layers for optimal electrical connectivity, while the peripheral regions have patterned gaps and isolation structures to prevent edge-related charge buildup and defects, thus maintaining large device area while eliminating edge problems.
Solution Approach 2:
The conductor layer is segmented into continuous central regions and patterned peripheral regions with gaps and isolation structures. This segmentation allows the device to maintain large overall area while preventing charge buildup at edges through the discontinuous peripheral conductor pattern.
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 unwanted coloration and charge buildup, enhances device performance, and simplifies the manufacturing process by minimizing laser scribing and isolation scribes, leading to more reliable and cost-effective electrochromic devices.
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
Various edge deletion and isolation scribes are performed, for example, to ensure the optical device has appropriate isolation from any edge defects
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.