Fractional deviations in precursor stoichiometry dictate the properties, performance and stability of perovskite photovoltaic devices.

ABSTRACT: The last five years have witnessed remarkable progress in the field of lead halide perovskite materials and devices. Examining the existing body of literature reveals staggering inconsistencies in the reported results among different research groups with a particularly wide spread in the photovoltaic performance and stability of devices. In this work we demonstrate that fractional, quite possibly unintentional, deviations in the precursor solution stoichiometry can cause significant changes in the properties of the perovskite layer as well as in the performance and stability of perovskite photovoltaic devices. We show that while the absorbance and morphology of the layers remain largely unaffected, the surface composition and energetics, crystallinity, emission efficiency, energetic disord

SUBMITTER: Fassl P 

PROVIDER: S-EPMC6333261 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature