Multi-Tipped Impedance Sensor for Rapid Photovoltaic Screening
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Solution Overview
Problem
Existing methods are cumbersome and unreliable for characterizing large substrate areas in photovoltaic applications, particularly for dielectric layers on rolling assisted biaxially textured substrates, as they require repeated impedance measurements, which is impractical for large-scale dielectric material screening.
Innovation Solution
An array of conducting polymeric rods or discs is used as an upper contact on the substrate, connected to an impedance analyzer via a switchboard, allowing simultaneous impedance measurements across multiple spots on a large substrate, utilizing a bottom electrode provided by the RABiTs substrate to assess the dielectric layer's quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If repeated impedance measurements are performed with a small metal contact/electrode on a large substrate, then the quality of the dielectric material under the contact can be obtained, but the process becomes cumbersome and potentially unreliable for large-scale screening
Solution Approach 1:
The single measurement contact is segmented into an array of multiple conducting rods or discs distributed across the substrate surface. Each rod/disc acts as an independent measurement point, allowing parallel impedance measurements at multiple locations simultaneously, thereby improving productivity while maintaining measurement precision through systematic coverage of the entire substrate.
Solution Approach 2:
The measurement approach transitions from a single-point contact to a two-dimensional array of contacts distributed across the substrate surface. This dimensional expansion enables simultaneous measurement of multiple spots across the large substrate, transforming a sequential measurement process into a parallel one, thus resolving the contradiction between measurement precision and screening efficiency.
2Measurement precision
If repeated impedance measurements are performed with a small metal contact/electrode on a large substrate, then the quality of the dielectric material under the contact can be obtained, but the process becomes unreliable for large substrate areas
Solution Approach 1:
The single measurement contact is segmented into an array of multiple conducting rods or discs distributed across the substrate surface. Each rod/disc acts as an independent measurement point, allowing parallel impedance measurements at multiple locations simultaneously, thereby improving productivity while maintaining measurement precision through systematic coverage of the entire substrate.
Solution Approach 2:
The measurement approach transitions from a single-point contact to a two-dimensional array of contacts distributed across the substrate surface. This dimensional expansion enables simultaneous measurement of multiple spots across the large substrate, transforming a sequential measurement process into a parallel one, thus resolving the contradiction between measurement precision and screening efficiency.
3Device complexity
If a single contact/electrode is used for impedance measurement on a large substrate, then the device complexity is low, but the measurement coverage and reliability are insufficient
Solution Approach 1:
The single measurement contact is segmented into an array of multiple conducting rods or discs distributed across the substrate surface. Each rod/disc acts as an independent measurement point, allowing parallel impedance measurements at multiple locations simultaneously, thereby improving productivity while maintaining measurement precision through systematic coverage of the entire substrate.
Solution Approach 2:
The array of conducting rods or discs serves multiple functions simultaneously: it acts as both the upper contact electrode and the measurement probe array, and each element in the array can independently perform impedance measurements. This multi-functionality allows the system to cover the entire substrate area while maintaining relatively simple device architecture.
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 method enables efficient characterization of the entire substrate surface, allowing for the monitoring and characterization of material and process variations, improving the reliability and efficiency of dielectric layer screening in photovoltaic applications.
Implementation Method 1
Impedance measurements provide a useful method to assess electrical properties of materials such that depending on the test frequency one can obtain whether the material has low or high resistance, in other words, whether such material is conducting or dielectric, respectively.
Data Source
AI summary
An apparatus and method of testing electrical impedance of a multiplicity of regions of a photovoltaic surface includes providing a multi-tipped impedance sensor with a multiplicity of spaced apart impedance probes separated by an insulating material, wherein each impedance probe includes a first end adapted for contact with a photovoltaic surface and a second end in operable communication with an impedance measuring device. The multi-tipped impedance sensor is used to contact the photovoltaic surface and electrical impedance of the photovoltaic material is measured between individual first ends of the probes to characterize the quality of the photovoltaic surface.