Solar cell module

A solar cell module including a substrate and solar cells mounted on the substrate, the substrate including a base layer, a first insulation layer positioned over the base layer, a second insulation layer positioned over the first insulation layer and defining a surface, a first bus bar layer positioned between the first and second insulation layers, the first bus bar layer including at least one bus bar extending across the substrate, and a second bus bar layer positioned over the second insulation layer, the second bus bar layer including bus bars, wherein the solar cells are mounted on the surface and are electrically interconnected by the bus bars of the second bus bar layer.