Prof. Michael D. McGehee, Univ. Boulder, Colorado
photovoltaics for highly efficient next-generation tandems due to excellent optoelectronic properties, low-cost manufacturability, and bandgap tunability. Here, we alloy chlorine into the perovskite lattice to [...] perovskite into solar cells, obtaining single junction devices with open-circuit voltages >1.2 V and >20% efficiency, and monolithic perovskite/silicon tandem solar cells with voltages approaching 1.9 V and