Modification of the fluorinated tin oxide/electron-transporting material interface by a strong reductant and its effect on perovskite solar cell efficiency by Pulvirenti, F, Wegner, B, Noel, NK, Mazzotta, G, Hill, R, Patel, JB, Herz, LM, Johnston, MB, Riede, MK, Snaith, HJ, Koch, N, Barlow, S, Marder, SR