title: Development of new two-dimensional small molecules based on benzodifuran for efficient organic solar cells.
abstract: A new organic small molecule, DCA3TBDF, with a 2D benzo[1,2-b:4,5-b']difuran (BDF) moiety as the central core and octyl cyanoacetate units as the end-capped blocks, was designed and synthesized for solution-processed bulk heterojunction solar cells. DCA3TBDF possesses good solubility in common organic solvents such as toluene, CH2Cl2, chlorobenzene, and CHCl3 and good thermal stability with an onset decomposition temperature with 5% weight-loss occurring at 361 °C. The DCA3TBDF thin film showed a broad absorption at λ=320-700 nm and high crystallinity. Small-molecule organic solar cells based on DCA3TBDF and [6,6]-phenyl-C61-butyric acid methyl ester demonstrated promising power conversion efficiency with a high fill factor under the illumination of AM 1.5G (100 mW cm(-2)).
authors.affiliation: CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101 (China), Fax: (+86) 532-80662778; University of Chinese Academy of Sciences, Beijing 100049 (China).
authors.forename: Zhengkun
authors.initials: Z
authors.lastname: Du
authors.forename: Yanhua
authors.initials: Y
authors.lastname: Chen
authors.forename: Weichao
authors.initials: W
authors.lastname: Chen
authors.forename: Shanlin
authors.initials: S
authors.lastname: Qiao
authors.forename: Shuguang
authors.initials: S
authors.lastname: Wen
authors.forename: Qian
authors.initials: Q
authors.lastname: Liu
authors.forename: Dangqiang
authors.initials: D
authors.lastname: Zhu
authors.forename: Mingliang
authors.initials: M
authors.lastname: Sun
authors.forename: Renqiang
authors.initials: R
authors.lastname: Yang
mesh_terms: D003497:Cyclic N-Oxides / Q000737:chemistry*; D011211:Electric Power Supplies; D015394:Molecular Structure; D010069:Oxadiazoles / Q000737:chemistry*; D054852:Small Molecule Libraries / Q000138:chemical synthesis* / Q000737:chemistry; D012993:Solar Energy; D013696:Temperature
chemical_list: D003497:Cyclic N-Oxides; D010069:Oxadiazoles; D054852:Small Molecule Libraries; C412382:benzo(1,2-c:3,4-c')bis(1,2,5)oxadiazole-1,6-dioxide
keywords: benzodifuran; donor-acceptor systems; heterocycles; organic electronics; small molecules