dominated by narrow-band-gap species and peaked at 670−790 nm, in the range from deep-red to near-infrared (NIR). The external electroluminescent (EL) quantum efficiencies reached 1.1% and 0.3% for devices from these two types of copolymers, respectively. Bulk−heterojunction polymer photovoltaic cells (PPVCs) made from composite thin film of the copolymer 9,9-dioctylfluorene and SeBT (PFO−SeBT) in blend
一系列新的半导体共轭共聚物,衍生自烷基取代的
芴,4,7-二
硒酚-2'-yl-
2,1,3-苯并噻二唑(SeBT)和4,7-二
硒酚-2'-yl-2通过
钯催化的Suzuki偶联反应,以不同的进料比合成1,3,3-苯并
硒二唑(SeBSe)。共聚物的光学带隙非常低,对于SeBT为1.87 eV,对于SeBSe为1.77 eV。观察到从
芴链段到窄带隙位点的有效快速能量转移。光致发光和电致发光的发射主要由窄带隙物质控制,并在670-790 nm处达到峰值,范围从深红色到近红外(NIR)。对于这两种类型的共聚物,器件的外部电致发光(EL)量子效率分别达到1.1%和0.3%。61
丁酸甲酯(PCBM)作为活性层显示出令人鼓舞的性能。在
AM1.5太阳模拟器下(78.2 mW / cm 2),能量转换效率(
ECE)高达1%。对于来自PFO-SeBT和PFO-SeBSe的PP
VC,光谱响应分别扩展到675和750 nm。