A SnOx–brookite TiO2 bilayer electron collector for hysteresis-less high efficiency plastic perovskite solar cells fabricated at low process temperature

Abstract

Thin plastic film-based CH₃NH₃PbI_3−xCl_x perovskite solar cells were fabricated at low process temperature using a bilayer comprising an amorphous SnO_x and mesoporous brookite TiO₂ as electron collectors. Void-less high quality heterojunction structures achieve hysteresis-less photovoltaic performance with a power conversion efficiency as high as 13.4% and mechanical stability against cyclic bending.