芴-呋喃苯并噻二唑共聚物的光电性能  

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

作　　者：罗洁[1,2,3] 阳仁强[4] 杨伟[1,2] 曹镛[1,2] 

机构地区：[1]华南理工大学高分子光电材料与器件研究所 [2]特种功能材料及其制备新技术教育部重点实验室,广州510640 [3]广东工业大学实验教学部,广州510006 [4]中国科学院青岛生物能源与过程研究所,青岛266101

出　　处：《中国科学：化学》2010年第2期161-166,共6页SCIENTIA SINICA Chimica

基　　金：国家重点基础研究发展计划(编号:2009CB623601);国家自然科学基金(批准号:50433030)资助

摘　　要：对芴-呋喃苯并噻二唑共聚物的吸收光谱、光致发光光谱、电致发光性能和光伏性能进行了研究.共聚物在382nm和530nm处有两处明显的吸收峰,其中530nm处的吸收强度随着共聚物中呋喃苯并噻二唑单元(FBT)含量的增加而增加.随着FBT单元含量的增加,电致发光峰值从611nm红移至702nm.以PVK为空穴传输层,共聚物PFO-FBT0.1为发光层的发光器件,在33mA/cm2电流密度下的外量子效率达2.32%,亮度为441cd/m2.实验中观察到快速的链内能量陷阱过程(从芴到FBT单元).以共聚物PFO-FBT50为电子给体、PCBM为电子受体(重量比1:2)共混制备的光电池能量转换效率为1.13%,开路电压0.85V,短路电流3.39mA/cm2,光谱响应边延伸至近750nm.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 FBT content. The EL emissions are red-shifted from 611 nm to 702 nm with 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/A1 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 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：芴-呋喃苯并噻二唑 共聚物 发光性能 光伏性能 

分 类 号：O633.5[理学—高分子化学]