Spectroscopic investigation of the effect of microstructure and energetic offset on the nature of interfacial charge transfer states in polymer: fullerene blends - Dimitrov, SD; Azzouzi, M; Wu, J; Yao, J; Dong, Y; Tuladhar, PS; Schroeder, BC; Bittner, ER; McCulloch, I; Nelson, J; Durrant, JR (Journal of the American Chemical Society, 2019)