title: High-Performance Electron Acceptor with Thienyl Side Chains for Organic Photovoltaics.
abstract: We develop an efficient fused-ring electron acceptor (ITIC-Th) based on indacenodithieno[3,2-b]thiophene core and thienyl side-chains for organic solar cells (OSCs). Relative to its counterpart with phenyl side-chains (ITIC), ITIC-Th shows lower energy levels (ITIC-Th: HOMO = -5.66 eV, LUMO = -3.93 eV; ITIC: HOMO = -5.48 eV, LUMO = -3.83 eV) due to the σ-inductive effect of thienyl side-chains, which can match with high-performance narrow-band-gap polymer donors and wide-band-gap polymer donors. ITIC-Th has higher electron mobility (6.1 × 10(-4) cm(2) V(-1) s(-1)) than ITIC (2.6 × 10(-4) cm(2) V(-1) s(-1)) due to enhanced intermolecular interaction induced by sulfur-sulfur interaction. We fabricate OSCs by blending ITIC-Th acceptor with two different low-band-gap and wide-band-gap polymer donors. In one case, a power conversion efficiency of 9.6% was observed, which rivals some of the highest efficiencies for single junction OSCs based on fullerene acceptors.
authors.affiliation: Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University , Beijing 100871, China.|Department of Chemistry, Capital Normal University , Beijing 100048, China.|Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Yuze
authors.initials: Y
authors.lastname: Lin
authors.affiliation: Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Fuwen
authors.initials: F
authors.lastname: Zhao
authors.affiliation: Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University , Beijing 100871, China.
authors.forename: Qiao
authors.initials: Q
authors.lastname: He
authors.affiliation: Heeger Beijing Research and Development Center, School of Chemistry and Environment, Beihang University , Beijing 100191, China.
authors.forename: Lijun
authors.initials: L
authors.lastname: Huo
authors.affiliation: State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University , Xi'an 710049, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Wu
authors.affiliation: School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology , Atlanta, Georgia 30332-0400, United States.
authors.forename: Timothy C
authors.initials: TC
authors.lastname: Parker
authors.affiliation: State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University , Xi'an 710049, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Ma
authors.affiliation: Heeger Beijing Research and Development Center, School of Chemistry and Environment, Beihang University , Beijing 100191, China.
authors.forename: Yanming
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Chunru
authors.initials: C
authors.lastname: Wang
authors.affiliation: Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Daoben
authors.initials: D
authors.lastname: Zhu
authors.affiliation: Heeger Beijing Research and Development Center, School of Chemistry and Environment, Beihang University , Beijing 100191, China.
authors.forename: Alan J
authors.initials: AJ
authors.lastname: Heeger
authors.affiliation: School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology , Atlanta, Georgia 30332-0400, United States.
authors.forename: Seth R
authors.initials: SR
authors.lastname: Marder
authors.affiliation: Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University , Beijing 100871, China.
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Zhan