At month 18 of its three-year Horizon Europe project, the PEARL consortium has made decisive progress toward its target of 25% efficient, low-cost flexible perovskite solar cells with carbon electrodes. By combining cutting-edge materials research, pilot-scale roll-to-roll (R2R) manufacturing and comprehensive sustainability measures, partners across Europe have delivered a series of significant achievements. The researchers have developed solar cells with an efficiency of more than 21% on...