EU PVSEC Programme Online
EU PVSEC 2021, 6 - 10 September 2021
Presentation: 4AV.1.12 Three-Dimensional Multi-Ribbon Back-Contact Interconnection: Latest Results on Reliability Testing
Type: Visual
Date: Monday, 6th September 2021
15:15 - 16:45
Author(s): R. Van Dyck, T. Borgers, J. Govaerts, A.S.H. van der Heide, L. Tous, J. Poortmans, A.W. Van Vuure
Presenter / Speaker: R. Van Dyck, KU Leuven, Leuven, Belgium
Event: Conference Conference
Session: 4AV.1 PV Module Design, Components and Ageing
Topic: 4. 1 PV Module Design, Manufacture, Performance and Reliability
Keywords: Back Contact, PV Module, Interconnection, Multi-Ribbon
Summary / Abstract: Back-contact solar cells are gaining terrain in the PV industry, although the lack of a standardized and low-cost interconnection method inhibits their market growth. To overcome this challenge, the three-dimensional multi-ribbon interconnection is proposed by imec as a novel interconnection concept for highly efficient back-contact cells. It is based on an interconnection fabric of encapsulant with incorporated metal ribbons that form a three-dimensional network. Module fabrication consists of a layup phase and a lamination step. In the layup step, a stack is established with the frontsheet, a front encapsulant, the cells, the interconnection fabric a glass or polymer backsheet. During the lamination step, soldering and encapsulation happen simultaneously. In previous research, the concept was tested in two four-cell modules with interdigitated back-contact (IBC) cells, both passing three times the IEC 61215 standard for thermal cycling reliability testing. In this work, these modules were tested using damp-heat and humidity-freeze tests. No significant sign of degradation was observed based on electrical characterization and electroluminescence imaging after consecutive 1000 hours of damp-heat and 50 cycles of humidity-freeze exposure.