Dr Bart Roose obtained his Ph.D. from the Adolphe Merkle Institute (Fribourg, Switzerland), studying metal oxide contacts for perovskite solar cells. He then took up a Newton International Fellowship at the Cavendish Laboratory (Cambridge, UK) to study aging and degradation mechanisms of lead halide perovskites. He is currently leading the photovoltaic research activities at the Optoelectronic Materials and Device Spectroscopy Group in the Department of Chemical Engineering & Biotechnology (Cambridge, UK), focusing on all-perovskite tandem solar cells. His research interests are dynamic processes in halide perovskites, sustainability, and novel applications of emerging photovoltaic technologies.