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      Local resolution of currents through electrical joints consisting of materials with different conductivity

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          Abstract

          Within this work the impact of contact materials with higher volume resistivity as leaded solder are investigated in terms of comparability of the current conduction through the joint. An approach was developed to experimentally determine the qualitative local current density by magnetic field imaging (MFI) at ribbon-to-ribbon contact samples. The result reveals that the MFI technique on a symmetric sample design allows the evaluation of the current paths in two-dimensional contact areas. Different resistivities of the contact material result in characteristic differences in current distribution through the joint. Low resistive Sn 60Pb 40-soldererd contacts exhibit localized current injection whereas the tested contact based on electrically conductive adhesives (ECAs) show an extended current flow through the ECA-based contact. A FEM-based simulation model to mimic the used setup was developed and confirmed the results by taking different contact material resistivities into account. For materials with resistivities larger than 1 · 10 −3 Ω · cm current injection was found to spread-spatially within the tested contact geometry. Contact material development as well as contact design can benefit from that approach, allowing consumption and material composition optimization. A further advantage is the feasibility of the method to study production failures like inhomogeneous ECA distribution enabling a non-destructive monitoring of process stability and root cause analysis.

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          Electrical resistivity of copper, gold, palladium, and silver

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            Using a magnetometer to image a two‐dimensional current distribution

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              Investigation of Acetic Acid Corrosion Impact on Printed Solar Cell Contacts

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                Author and article information

                Journal
                epjpv
                https://www.epj-pv.org
                EPJ Photovoltaics
                EPJ Photovolt.
                EDP Sciences
                2105-0716
                30 November 2023
                30 November 2023
                2023
                : 14
                : ( publisher-idID: epjpv/2023/01 )
                : 38
                Affiliations
                Fraunhofer Center for Silicon Photovoltaics CSP, , Otto-Eißfeldt-Straße 12, 06120 Halle (Saale), Germany,
                Author notes
                Article
                pv230029
                10.1051/epjpv/2023029
                3a0f2b0a-ca06-478c-bed9-2b3a49354783
                © S. Großer et al., Published by EDP Sciences, 2023

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 30 June 2023
                : 7 September 2023
                : 11 October 2023
                Page count
                Figures: 8, Tables: 0, Equations: 1, References: 18, Pages: 9
                Funding
                Funded by: Federal Ministry for Economic Affairs and Climate Action
                Award ID: 03EE1005B
                Categories
                Modules and Systems
                Special Issue on ‘EU PVSEC 2023: State of the Art and Developments in Photovoltaics’, edited by Robert Kenny and João Serra
                Regular Article
                Custom metadata
                EPJ Photovoltaics 14, 38 (2023)
                yes
                2023
                2023
                2023

                Sustainable & Green chemistry,Materials technology,Semiconductors,Materials for energy,Technical & Applied physics,Renewable energy
                magnetic field imaging,ECA,simulation,solder,Interconnection

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