Unraveling the varied nature and roles of defects in hybrid halide perovskites with time-resolved photoemission electron microscopy. - Kosar S; Winchester AJ; Doherty TAS; Macpherson S; Petoukhoff CE; Frohna K; Anaya M; Chan NS; Madéo J; Man MKL; Stranks SD; Dani KM (Energy & environmental science, 2021)