Perovskite solar cells have offered rapid improvements in efficiency and potential for low-cost manufacturing but still suffer from energy losses and operational stability issues. Now a way has been found to dramatically reduce energy loss and boost the efficiency of perovskite solar cells by incorporating rubidium using lattice strain—a slight deformation in the atomic structure that helps keep rubidium in place.
https://actu.epfl.ch/news/strain-trick-improves-perovskite-solar-cells-effic