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Extensive Module Backsheet Qualification Protocol Correlated to SHJ Module Reliability
T. Bejat, M. Sérasset, E. Voroshazi, R. Soulas, L. Carbone, L. Sicot, V. Barth, M. Vite, G. Izzo, A. Ragonesi, F. Rametta, A. Fucile, C. Gerardi
PV Materials, Reliability, Durability, PV Module
Photovoltaic Modules and BoS Components
Subtopic: Materials for PV Modules, Durability, Reliability and Accelerated Testing Methods
Event: 8th World Conference on Photovoltaic Energy Conversion
Session: 3DO.17.3
577 - 579
ISBN: 3-936338-86-8
Paper DOI: 10.4229/WCPEC-82022-3DO.17.3
0,00 EUR
Document(s): paper


In the race of ultra-high performance modules and the integration of novel cell architectures for bifacial configuration, many efforts are required in order to ensure module reliability and maintain low BOM cost, leading to research of new material families and configuration among PV module backsheet. Although, PVF and PET based backsheets are in use since several decades with well-established testing methods [1], new materials, surface treatments and manufacturing methods, such as co-extrusion, are rapidly emerging in the PV backsheets field. Therefore, the new backsheet samples require new testing methods and characterization strategy since their structure and physical properties differ from the commonly used backsheets in PV industry. In this paper, we present a three-stage investigation strategy on nine commercial backsheets intended to be integrated in heterojunction (SHJ) PV modules manufactured by 3SUN [2]. We characterize three different groups of backsheets: first group containing a coextruded PP backsheet, the second group covers PET based backsheets containing aluminum laminated layer and the third group about laminated PET based backsheets without aluminum layer. First stage is material level testing (optical, mechanical, adhesion, water absorption and tensile strength) enabling rapid ranking based on backsheet intrinsic properties. Second stage is accelerated aging testing in mini-module configuration while third stage is full-sized module testing. The material characterization allowed the conclusion that adhesion properties seem to have the most influence on final module behavior while we need to highlight that only the WVTR of backsheet material cannot predict the PV module behavior predictions in DH testing and adhesion strength plays a critical role.