Influence of fullerene photodimerization on the PCBM crystallization in polymer: Fullerene bulk heterojunctions under thermal stress (pages 1209–1214)
Fortunato Piersimoni, Giedrius Degutis, Sabine Bertho, Koen Vandewal, Donato Spoltore, Tim Vangerven, Jeroen Drijkoningen, Marlies K. Van Bael, An Hardy, Jan D'Haen, Wouter Maes, Dirk Vanderzande, Milos Nesladek and Jean Manca
Article first published online: 20 JUN 2013 | DOI: 10.1002/polb.23330
For an increased lifetime of polymer:fullerene bulk heterojunction solar cells, a thorough understanding of the factors that govern the morphological stability of the active layer blend under thermal stress is crucial. In this work, it is demonstrated that light exposure slows down fullerene crystallization and phase separation normally induced at elevated temperatures. The observed photostabilizing effect on active layer morphology is attributed to light-induced dimerization of the fullerene.