This difference of 1.2% abs explains the differences in efficiency of both module types. The 3-busbar solar cell modules have an average efficiency of 18.16%, but the multi-busbar modules could reach an average efficiency of 18.48%.
The multi-busbar solar cells are interconnected with 15 round Cu wires on the front and rear side of the solar cells. The Cu wires have a diameter of 300 μm. The wires and strings of the front and rear side of both cell types are soldered to a 5 mm wide, 500 μm high Cu ribbon each.
Today significant losses occur during stringing the cells in a module by using standard 3- busbar technology. In this paper an elegant approach for a front side design is discussed by using more busbars than the widely used 3-busbar design for the solar cell front electrode.
The multi-busbar solar cell is optimized for module integration. This can be observed taking a look at the fill factors of the modules. The average fill factor of the 3-busbar modules is in the range of 76.7%, w von Campe H, Huber S, Meyer S, Reif S, Vietor J. Direct tin-coating of aluminum rear contact by ultrasonic soldering.
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