Correlated Donor/Acceptor Crystal Orientation Controls Photocurrent Generation in All-Polymer Solar Cells
Marcel Schubert, Brian A. Collins, Hannah Mangold, Ian A. Howard, Wolfram Schindler, Koen Vandewal, Steffen Roland, Jan Behrends, Felix Kraffert, Robert Steyrleuthner, Zhihua Chen, Konstantinos Fostiropoulos, Robert Bittl, Alberto Salleo, Antonio Facchetti, Frédéric Laquai, Harald W. Ade and Dieter Neher
Article first published online: 17 APR 2014 | DOI: 10.1002/adfm.201304216
Splitting excitons into free charges can be very efficient at polymer/fullerene interfaces but it becomes a challenging task when the fullerene is replaced by a polymeric acceptor. Here, the structural origin of the photocurrent generation in P3HT:P(NDI2OD-T2) all-polymer solar cells is investigated. A proper relative orientation of the polymer crystallites is needed to create free charge carriers.