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UPS spectra of (a) MAPbI3 and (b) TiO2 doped with Mxenes. Results of DFT calculations concerning the electrostatic potential of planes perpendicular to the (c) MAPbI3/Ti3C2(OH)2 and (d) MAPbI3/Ti3C2O2 interface. Data taken from ref. [90]. Copyright Springer Nature@2019.
