文摘
Two-dimensional polyfluorenes bearing thienylenevinylene-bridged malononitrile (PF-BTDCN) or diethylthiobarbituric acid accepting side chains (PF-BTDTA) have been successfully prepared. The polymers were fully characterized for their physicochemical, electrochemical, and photovoltaic properties. These polymers exhibited greatly changed properties with the introduction of 蟺-conjugated accepting side chains. The enhancement of current density for the bulk-heterojunction solar cells was observed when replacing the PEDOT:PSS interfacial layer with molybdenum oxide (MoO3). Photovoltaic solar cells with the configuration ITO/MoO3/polymer:PCBM/Al exhibited an efficiency of 3.13% and 1.72% for PF-BTDCN and PF-BTDTA, respectively. A morphology study revealed the existence of nanoscale phase separation with interpenetration networks between polymer and PCBM domains.