Tress, WolfgangGraetzel, Michael2017-10-092017-10-092017-10-09201710.1109/EDTM.2017.7947503https://infoscience.epfl.ch/handle/20.500.14299/141114WOS:000409022100006In this contribution we give an overview of the recent development of metal-halide perovskite solar cells. We focus on the mixed electronic-ionic conductivity of this material, which causes hysteresis in the current-voltage curve. We discuss latest results on recombination obtained by electroluminescence measurements. We report on high luminescence yields (1%) and open-circuit voltages larger than 1.2 V, which are exceptional for a material with a bandgap of 1.6 eV and yield to efficiencies >21%. We identify the efficiency limiting processes and propose measures to overcome those.photovoltaicsrecombinationtext::conference output::conference proceedings::conference paper