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

作　　者：Luo Jie Yang RenQiang Yang Wei Cao Yong 

机构地区：[1]S China Univ Technol, Inst Polymer Optoelect Mat & Devices, Guangzhou 510640, Peoples R China [2]Guangdong Univ Technol, Expt Teaching Ctr, Guangzhou 510006, Peoples R China [3]Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, Qingdao 266101, Peoples R China

出　　处：《Science China Chemistry》2010年第3期575-579,共5页中国科学（化学英文版）

基　　金：support from the Major State Basic Research Development program of China (Grant No 2009CB623601);the National Natural Science Foundation of China (Grant No 50433030)

摘　　要：【Abstract】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.<Abstract>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.

关 键 词：fluorene-co-furan-benzothiadiazole COPOLYMER photoluminescence photovoltaic cell 

分 类 号：O6[理学—化学]