Researchers at the National Renewable Energy Laboratory (NREL) and affiliated institutions across the country have bolstered the efficiency of perovskite solar cells by as much as 16%. The effort involved combining a two-dimensional (2D) perovskite layer with a three-dimensional (3D) perovskite layer, which yielded a solar cell with improvements in both efficiency and stability. Ongoing research into the crystalline structure of perovskites as a cheaper and more efficient alternative to silico...