Non-equilibrium transport in polymer mixed ionic–electronic conductors at ultrahigh charge densities by Tjhe, DHL, Ren, X, Jacobs, IE, D’Avino, G, Mustafa, TBE, Marsh, TG, Zhang, L, Fu, Y, Mansour, AE, Opitz, A, Huang, Y, Zhu, W, Unal, AH, Hoek, S, Lemaur, V, Quarti, C, He, Q, Lee, J, McCulloch, I, Heeney, M, Koch, N, Grey, CP, Beljonne, D, Fratini, S