Optoelectronic and charge transport properties at organic-organic semiconductor interfaces: Comparison between polyfluorene-based polymer blend and copolymer - Kim, J-S; Lu, L; Sreearunothai, P; Seeley, A; Yim, K-H; Petrozza, A; Murphy, CE; Beljonne, D; Cornil, J; Friend, RH (JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2008)