Giant V oc Boost of Low‐Temperature Annealed Cu(In,Ga)Se 2 with Sputtered Zn(O,S) Buffers

This work was partially supported by the European Union's Horizon 2020 research and innovation program under grant agreement No. 641004 (project Sharc25). The authors acknowledge additional support by the Spanish project AIC‐B‐2011‐0806, and by the “Micro‐concentrator thin film solar cells (MiconCell)” project (028922) and the “Correlated Analysis of Inorganic Solar Cells in and outside an Electron Microscope (CASOLEM)” project (028917), both co‐funded by FCT and ERDF through COMPETE2020. DC acknowledges the European Commission for funding the NanoTrainforGrowth II project No. 713640 through the Marie Curie Cofund programme.