Combined Interconnection and Lamination of Bifacial Busbarless Cells through Woven Wiring

Abstract

In this work we present a new technology for simultaneously interconnecting and encapsulating bifacial busbarless solar cells, using a multi-wire approach combined with weaving technology. A background discussion on existing multi-wire interconnection technologies allows to compare this new approach, which potentially improves performance and reliability and reduces process complexity and costs. After a more in-depth review of the weaving aspects, an extensive experimental campaign has been performed to optimize the combined interconnection/lamination process and obtain homogeneous solder joints. Preliminary thermal cycling tests have been executed, showing the stability and reliability of the solder joint contacts on 1-cell glass-glass laminates. Finally, the realization of a 2x2-cell-module proof-of-concept demonstrates the technical viability and performance of the technology.