Electronic and Morphological Inhomogeneities in Pristine and Deteriorated Perovskite Photovoltaic Films.

ABSTRACT: We perform scanning microwave microscopy (SMM) to study the spatially varying electronic properties and related morphology of pristine and degraded methylammonium lead-halide (MAPI) perovskite films fabricated under different ambient humidity. We find that higher processing humidity leads to the emergence of increased conductivity at the grain boundaries but also correlates with the appearance of resistive grains that contain PbI₂. Deteriorated films show larger and increasingly insulating grain boundaries as well as spatially localized regions of reduced conductivity within grains. These results suggest that while humidity during film fabrication primarily benefits device properties due to the passivation of traps at the grain boundaries and self-doping, it also results in the

SUBMITTER: Berweger S 

PROVIDER: S-EPMC5518572 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature