title: Small-Molecule Acceptor Based on the Heptacyclic Benzodi(cyclopentadithiophene) Unit for Highly Efficient Nonfullerene Organic Solar Cells.
abstract: A new nonfullerene small molecule with acceptor-donor-acceptor (A-D-A) structure, namely, NFBDT, based on a heptacyclic benzodi(cyclopentadithiophene) (FBDT) unit using benzo[1,2-b:4,5-b']dithiophene as the core unit, was designed and synthesized. Its absorption ability, energy levels, thermal stability, as well as photovoltaic performances were fully investigated. NFBDT exhibits a low optical bandgap of 1.56 eV resulting in wide and efficient absorption that covered the range from 600 to 800 nm, and suitable energy levels as an electron acceptor. With the widely used and successful wide bandgap polymer PBDB-T selected as the electron donor material, an optimized PCE of 10.42% was obtained for the PBDB-T:NFBDT-based device with an outstanding short-circuit current density of 17.85 mA cm-2under AM 1.5G irradiation (100 mW cm-2), which is so far among the highest performance of NF-OSC devices. These results demonstrate that the BDT unit could also be applied for designing NF-acceptors, and the fused-ring benzodi(cyclopentadithiophene) unit is a prospective block for designing new NF-acceptors with excellent performance.
authors.affiliation: The Key Laboratory of Functional Polymer Materials and State Key Laboratory and Institute of Elemento-Organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University , Tianjin 300071, China.|School of Materials Science and Engineering, The National Institute for Advanced Materials, Nankai University , Tianjin 300071, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Kan
authors.affiliation: The Key Laboratory of Functional Polymer Materials and State Key Laboratory and Institute of Elemento-Organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University , Tianjin 300071, China.|School of Materials Science and Engineering, The National Institute for Advanced Materials, Nankai University , Tianjin 300071, China.
authors.forename: Huanran
authors.initials: H
authors.lastname: Feng
authors.affiliation: The Key Laboratory of Functional Polymer Materials and State Key Laboratory and Institute of Elemento-Organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University , Tianjin 300071, China.|School of Materials Science and Engineering, The National Institute for Advanced Materials, Nankai University , Tianjin 300071, China.
authors.forename: Xiangjian
authors.initials: X
authors.lastname: Wan
authors.affiliation: Department of Physics and Astronomy, Shanghai Jiaotong University , Shanghai 200240, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.affiliation: The Key Laboratory of Functional Polymer Materials and State Key Laboratory and Institute of Elemento-Organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University , Tianjin 300071, China.|School of Materials Science and Engineering, The National Institute for Advanced Materials, Nankai University , Tianjin 300071, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Ke
authors.affiliation: The Key Laboratory of Functional Polymer Materials and State Key Laboratory and Institute of Elemento-Organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University , Tianjin 300071, China.|School of Materials Science and Engineering, The National Institute for Advanced Materials, Nankai University , Tianjin 300071, China.
authors.forename: Yanbo
authors.initials: Y
authors.lastname: Wang
authors.affiliation: The Key Laboratory of Functional Polymer Materials and State Key Laboratory and Institute of Elemento-Organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University , Tianjin 300071, China.|School of Materials Science and Engineering, The National Institute for Advanced Materials, Nankai University , Tianjin 300071, China.
authors.forename: Yunchuang
authors.initials: Y
authors.lastname: Wang
authors.affiliation: The Key Laboratory of Functional Polymer Materials and State Key Laboratory and Institute of Elemento-Organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University , Tianjin 300071, China.|School of Materials Science and Engineering, The National Institute for Advanced Materials, Nankai University , Tianjin 300071, China.
authors.forename: Hongtao
authors.initials: H
authors.lastname: Zhang
authors.affiliation: The Key Laboratory of Functional Polymer Materials and State Key Laboratory and Institute of Elemento-Organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University , Tianjin 300071, China.|School of Materials Science and Engineering, The National Institute for Advanced Materials, Nankai University , Tianjin 300071, China.
authors.forename: Chenxi
authors.initials: C
authors.lastname: Li
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Jianhui
authors.identifier: 0000-0002-2105-6922
authors.initials: J
authors.lastname: Hou
authors.affiliation: The Key Laboratory of Functional Polymer Materials and State Key Laboratory and Institute of Elemento-Organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University , Tianjin 300071, China.|School of Materials Science and Engineering, The National Institute for Advanced Materials, Nankai University , Tianjin 300071, China.
authors.forename: Yongsheng
authors.identifier: 0000-0003-1448-8177
authors.initials: Y
authors.lastname: Chen