The importance of microstructure in determining polaron generation yield in poly(9,9-dioctylfluorene) by Cheetham, NJ, Ortiz, M, Perevedentsev, A, Dion-Bertrand, L-I, Greetham, GM, Sazanovich, IV, Towrie, M, Parker, AW, Nelson, J, Silva, C, Bradley, DDC, Hayes, SC, Stavrinou, P