A team of EPFL and CSEM researchers in Neuchâtel presents in Nature Energy a new method of creating crystalline solar cells with electrical contacts at the rear, suppressing all shadowing at the front. Due to the new inexpensive approach, the fabrication process is strongly simplified, with efficiencies in the laboratory already surpassing 23%.   In the quest for more efficient crystalline silicon solar cells with low manufacturing costs, one of the most promising approach is to bring all elec...