Long-Lived Exciplex Formation and Delayed Exciton Emission in Bulk Heterojunction Blends of Silole Derivative and Polyfluorene Copolymer: The Role of Morphology on Exciplex Formation and Charge Separation - Benson-Smith, JJ; Wilson, J; Dyer-Smith, C; Mouri, K; Yamaguchi, S; Murata, H; Nelson, J (JOURNAL OF PHYSICAL CHEMISTRY B, 2009)