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“Interfacial charge-transfer doping of metal halide perovskites for high performance photovoltaics,” N.K. Noel, S.N. Habisreutinger, A. Pellaroque, F. Pulvirenti, B. Wenger, F. Zhang, Y.-H. Lin, O.G. Reid, J. Leisen, Y. Zhang, S. Barlow, S.R. Marder, A. Kahn, H.J. Snaith, C.B. Arnold, B.P. Rand, Energy Environ. Sci., 12, 3063 (2019). Also see news article: "Doping comes into play," G. Tregnago, Nature Energy, 4, 821 (2019)