Research in Professor Richard King’s group includes technologies for one-sun, flat-plate multijunction cells, defect tolerance at grain boundaries and other defects in perovskites and wide-bandgap CIGS-related materials, physics of recombination-benign defects, low-cost polycrystalline III-V solar cells, dilute nitride Ga(In)NAs(Sb), and integration of compound semiconductors with high-efficiency silicon solar cells.