Spectroscopic Signatures of Photogenerated Radical Anions in Polymer-[C70]Fullerene Bulk Heterojunctions

a Experimental Physics VI, Julius Maximilian University Wurzburg, 97074 Wurzburg, Germany b Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Wurzburg, Germany c Departamento de Quimica Organica, Universidad Complutense de Madrid, 28040 Madrid, Spain d IMDEA-Nanociencia, Facultad de Ciencias, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain e Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA