III-V/Si Tandem Cell to Module Interconnection - Comparison Between Different Operation Modes

III-V/Si tandem solar cells have the potential to surpass the theoretical efficiency limit of silicon solar cells. On the cell level it was shown at this conference that three-terminal tandem (3T) devices consisting of III-V top and Si bottom cell perform as well as operating the subcells independently. However, integrating these 3T devices in a module requires voltage matching of the top and the bottom cell. Here we investigate the robustness of 3T III-V/Si tandem devices in comparison with independently operated and current matched two terminal devices with respect to spectral and thermal effects. Under most conditions, interconnected voltage matched devices are able to perform as well as those with independent operation of the top and bottom cell, and prove that 3T devices significantly outperform current matched devices.