“Multiple charge transfer states in donor-acceptor heterojunctions with large frontier orbital energy offsets,” S.-U.-Z. Khan, G. Londi, X. Liu, M.A. Fusella, G. D'Avino, L. Muccioli, A.N. Brigeman, B. Niesen, T.C.-J. Yang, Y. Olivier, J.T. Dull, N.C. Giebink, D. Beljonne, B.P. Rand, Chem. Mater., 31, 6808 (2019).