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. 2015 Mar 3;5:8704. doi: 10.1038/srep08704

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(a) Three dimensional representation of the measured CPD and the nc-TiO₂/MAPbI₃ and (b) the nc-Al₂O₃/MAPbI₃ interface. (c) CPD profile and the corresponding electric field, dCPD/dx, for the nc-TiO₂/MAPbI₃ (d) for the nc-Al₂O₃/MAPbI₃ interface. The depletion width at the perovskite is defined as W_p.