title: Organic donor materials based on Bis(arylene ethynylene)s for bulk heterojunction organic solar cells with high V(oc) values.
abstract: A series of purely organic small molecules 1-4 based on bis(arylene ethynylene)s with various electron-rich aromatic bridges, such as benzene, cyclopentadithiophene (CDT), and diphenyl(p-tolyl)amine, were synthesized by a Sonogashira coupling reaction. Their optical, electronic, and electrochemical properties were fully characterized. The photovoltaic properties of these molecules as donor materials and [6,6]-phenyl-C71 -butyric acid methyl ester as an acceptor material in solution-processed bulk heterojunction devices were studied. Among them, CDT-bridged molecule 2 exhibited the best photovoltaic performance and achieved a power conversion efficiency of 3.28 %. In addition, the photovoltaic efficiencies of these molecules are higher than their corresponding platinum-containing counterparts, probably owing to their stronger light absorption and improved open-circuit voltage.
authors: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, No. 5625, Renmin Street, Changchun 130022 (P. R. China); Department of Chemistry, Partner State Key Laboratory of Environmental and Biological Analysis and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong (S.A.R. China).
authors: Hongmei
authors: H
authors: Zhan
authors: Qian
authors: Q
authors: Liu
authors: Fengrong
authors: F
authors: Dai
authors: Cheuk-Lam
authors: CL
authors: Ho
authors: Yingying
authors: Y
authors: Fu
authors: Leijiao
authors: L
authors: Li
authors: Li
authors: L
authors: Zhao
authors: Hua
authors: H
authors: Li
authors: Zhiyuan
authors: Z
authors: Xie
authors: Wai-Yeung
authors: WY
authors: Wong
keywords: conjugation; donor-acceptor systems; electrochemistry; organic solar cells; photochemistry