Optoelectronic properties of fluorene-co-4,7-difuran-2,1,3-benzothiadiazole copolymers

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Light-emitting and photovoltaic properties of copolymers(PFO-FBT) based on 9,9-dioctylfluorene and 4,7-difuran-2,1,3-benzothiadiazole(FBT) units were investigated.The copolymers show two absorbance peaks at around 382 nm and 530 nm,respectively.The relative absorbance at around 530 nm of the PFO-FBT copolymers increases with the increasing FBT content.The EL emissions are red-shifted from 611 nm to 702 nm by increasing the FBT content in the copolymer.The highest EL external quantum efficiency achieved with the device configuration of ITO/PEDOT/PVK/PFO-FBT0.1/Ba/Al is 2.32% with the luminance of 441.3 cd/m2 at a current density of 33 mA/cm2.Efficient energy transfer due to exciton trapping on low band-gap FBT sites was observed.The bulk-heterojunction photovoltaic cell used PFO-FBT50 copolymer as the electron donor and methanofullerene [6,6]-phenyl C61-butyric acid methyl ester(PCBM) as the electron acceptor shows an energy conversion efficiency of 1.13% with open-circuit voltage(Voc) of 0.85 V and short-circuit current density(Jsc) of 3.39 mA/cm2 under AM 1.5 solar simulator(100 mW/cm2),and the edge of the spectral photoresponse is at ~750 nm. Light-emitting and photovoltaic properties of copolymers (PFO-FBT) based on 9,9-dioctylfluorene and 4,7-difuran-2,1,3-benzothiadiazole (FBT) units were investigated. These copolymers show two absorbance peaks at around 382 nm and 530 nm, respectively. The relative absorbance at around 530 nm of the increasing FBT content. The EL emissions are red-shifted from 611 nm to 702 nm by increasing the FBT content in the The highest EL external quantum efficiency achieved with the device configuration of ITO / PEDOT / PVK / PFO-FBT0.1 / Ba / Al is 2.32% with the luminance of 441.3 cd / m2 at a current density of 33 mA / cm2. Efficient energy transfer due to exciton trapping on low band-gap FBT sites was observed. The bulk-heterojunction photovoltaic cell used PFO-FBT50 copolymer as the electron donor and methanofullerene [6,6] -phenyl C61-butyric acid methyl ester (PCBM) as the electron acceptor shows an energy conversion efficiency of 1.13% with open-circuit vol tage (Voc) of 0.85 V and short-circuit current density (Jsc) of 3.39 mA / cm2 under AM 1.5 solar simulator (100 mW / cm2) and the edge of the specific photoresponse is at ~ 750 nm.
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