Photocurrent Enhancement from Diketopyrrolopyrrole Polymer Solar Cells through Alkyl-Chain Branching Point Manipulation - Meager,I; Ashraf,RS; Mollinger,S; Schroeder,BC; Bronstein,H; Beatrup,D; Vezie,MS; Kirchartz,T; Salleo,A; Nelson,J; McCulloch,I (JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2013)