New silicon thin-film technology associated with original DC-DC converter: An economic alternative way to improve photovoltaic systems efficiencies

► We optimized an innovative silicon thin film 4-wires tandem solar structure. ► The sub-cells are made of polymorphous and microcrystalline silicon. ► Electric decoupling of solar sub-cells leads to avoid current matching constraint. Robustness against current variations is enhanced and the efficiency is improved. The studied structure is combined with an original DC-DC converter. ► This systemic approach improves efficiency and reduces cost of the global structure.