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Impact of solvent exposure on the structure and electronic properties of CH3NH3PbI3−xClx mixed halide perovskite films


Organic semiconductor charge transport layers are important constituents of perovskite-based solar cells. To assess the suitability of potential solvents for the deposition of the charge transport layers on perovskite surfaces, the effect of solvent exposure on the properties of methyl ammonium lead mixed halide CH3NH3PbI3–xClx films is investigated by grazing incidence X-ray diffraction, atomic force microscopy, ultraviolet–visible absorption spectroscopy, and photoelectron spectroscopy. While exposure to dimethylformamide (DMF) and water instantly dissolves the perovskite film, exposure to chlorobenzene (CB) and chloroform (CF) does not detectably affect the perovskite bulk properties. However, the electronic properties of the perovskite surface are substantially modified by the solvent exposure, resulting in an increased work function and less n-type appearance.

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IS acknowledges the support of the Natural Sciences and Engineering Research Council of Canada (NSERC), [funding reference number RGPIN-2018-05092] and by Concordia University. MR and NK acknowledge support by the Helmholtz-Israel International Research School on Hybrid Integrated Systems for Conversion of Solar Energy (HI-SCORE). The authors thank Daniel Többens (HZB) for experimental support.

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Ralaiarisoa, M., Rodríguez, Y., Salzmann, I. et al. Impact of solvent exposure on the structure and electronic properties of CH3NH3PbI3−xClx mixed halide perovskite films. Appl. Phys. A 125, 470 (2019).

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