title: Evolution of the electron mobility in polymer solar cells with different fullerene acceptors.
abstract: We investigate the evolution of the electron mobility of two different acceptors, [6,6]-phenyl C71 butyric acid methyl ester (PC71BM) and indene-C60 bisadduct (ICBA), in a poly(3-hexylthiophene) blend solar cell during a prolonged thermal aging process. High electron mobility does not correlate with the best device performance in our study of the P3HT:PC71BM and P3HT:ICBA systems. Very little changes are observed in the polymer crystallinity as a function of time. The evolution of the acceptor appears to be the dominant factor that leads to long-term changes in the device performance. The electron mobility evolves differently in PC71BM and ICBA systems, which highlights the importance of the fullerene molecular structure.
authors.affiliation: Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6 Canada.
authors.forename: Dong
authors.initials: D
authors.lastname: Gao
authors.forename: Brandon
authors.initials: B
authors.lastname: Djukic
authors.forename: Weiqing
authors.initials: W
authors.lastname: Shi
authors.forename: Colin R
authors.initials: CR
authors.lastname: Bridges
authors.forename: Lisa M
authors.initials: LM
authors.lastname: Kozycz
authors.forename: Dwight S
authors.initials: DS
authors.lastname: Seferos
mesh_terms: D011211:Electric Power Supplies; D004583:Electrons; D037741:Fullerenes / Q000737:chemistry; D015394:Molecular Structure; D011108:Polymers / Q000737:chemistry*; D012993:Solar Energy
chemical_list: D037741:Fullerenes; D011108:Polymers