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Top: schematic representation of the XB between the passivating iodopentafluorobenzene (IPFB) unit and a generic halide anion at the perovskite surface. Bottom: performance of the perovskite solar cells with (red) and without (black) surface passivation, using spiro-OMeTAD as the hole transporter. Reprinted from ref (1094). Copyright 2014 American Chemical Society.
