Investigating Nanoscale Determinants of Charge Collection in Quasi-2D Perovskite Solar Cells

Quasi-2D perovskite photovoltaics have been shown to have better stability than their 3D counterparts but the effects of the A-site cation on charge collection have not been fully clarified in these systems. In this study, the nanoscale carrier collection properties within quasi-2D bromide based lead perovskites (n=3 and 40) are found to be uncorrelated with local variations in halide stoichiometry, in contrast to the 3D perovskite. The local elemental distribution is quantified by means of synchrotron-based nanoprobe X-ray fluorescence (Nano-XRF), while the local carrier collection is simultaneous collected via X-ray beam induced current (XBIC).