An international research team of photovoltaics scientists has taken a crucial step toward the industrialization of perovskite silicon tandem solar cells. Perovskite silicon tandem solar cells consist of a perovskite top cell and a silicon bottom cell. “So far, effective passivation has not been fully harnessed on textured perovskite silicon tandem solar cells, with prior success largely confined to flat-front architectures. In silicon solar cells, the passivation acts only close to the surface, whereas in perovskite solar cells, the surface treatment impacts the entire absorber, enhancing its bulk properties. “For today’s silicon solar cells, surface passivation was the key for high efficiencies in industrial production, and it is encouraging that the PV industry will benefit from these positive effects for perovskite silicon tandem solar cells as well.”