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)