The German analysis institute ISC Konstanz has developed a brand new methodology for measuring the contact resistance of photo voltaic cell interconnections made utilizing electrically conductive adhesives (ECA). The proposed methodology is reported to have the ability to precisely characterize each contact resistance and bulk resistivity.
Researchers on the International Solar Energy Research Center Konstanz (ISC Konstanz) in Germany have developed a brand new methodology to measure the contact resistance of photo voltaic cell interconnections made utilizing electrically conductive adhesives (ECAs).
ECAs are made from adhesive polymers with embedded metallic filler particles, comparable to silver. It can be utilized in photo voltaic PV designs primarily based on ribbon, shingle, and conductive backsheet interconnections. It will also be used to make silicon heterojunction (SHJ) and tandem perovskite-silicon cells.
The proposed methodology is reported to have the ability to precisely characterize each contact resistivity and bulk resistivity. “Better measurements of ECA bonding will allow optimization of ECA materials formulations, utilizing roughly filler, for instance, or utilizing completely different types of filler, or depositing completely different -different geometries of ECA materials on the bonding floor,” Daniel Tune, chief of the group tandems and new. supplies of ISC Konstanz, mentioned pv journal. Such adjustments in ECA are associated to efforts to scale back manufacturing prices with out negatively impacting efficiency.
The scientists defined that the 2 electrical parameters which might be necessary in optimizing the usage of ECA are contact resistance and bulk resistance. Bulk resistivity might be simply measured, however measuring contact resistivity is tougher as a result of calculated resistivity values might be strongly depending on samples and preparation situations, making it troublesome to check prototypes in different labs. or different groups.
“Now the 2 resistances of a variety of samples might be obtained utilizing the ISC methodology, which mixes a devoted measurement unit and pattern design with new algorithms to acquire the right resistivity values from datasets consisting of tons of of particular person measurements,” defined Tune.
When requested in regards to the switch of ECA’s detection expertise, Tune mentioned the measurements are actually supplied as a service to the business and the crew is working to seek out companions for commercialization.
An indication of behavioral expertise is described within the examine “The results of accelerating filler loading on the contact resistance of interconnects primarily based on silver-epoxied conductive adhesives and silver metallization pastes,” which was revealed by Advances in Photovoltaics.
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The analysis confirmed how optimization for bulk and get in touch with resistivity parameters enabled a “important” discount of silver, whereas sustaining a “similar” degree of product efficiency. The paper is the results of a collaboration between researchers from ISC Konstanz, Anhalt University of Applied Sciencesand the Fraunhofer Center for Silicon-Photovoltaics (CSP).
“We intention to create a technique for reproducible and dependable measurement of the contact resistance of ECA steel interfaces and it’s sure that with the right measurement setup and statistical therapy it ought to be potential,” mentioned the lead researcher of the examine Maria Ignacia Devoto Acevedo in a press launch.
“This is a superb instance of how a brand new method for measuring the basic properties of a cloth system can reveal necessary industrial vectors in materials R&D that have been beforehand unknown or unknown. solely on a qualitative foundation,” mentioned Tune.
Image: ISC Konstanz
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