Synthesis and Characterization of an Anthracene-Based Low Band Gap Polymer for Photovoltaic Devices
作者:In Hwan Jung、Hoyeon Kim、Wonho Lee、Byung Jun Jung、Han Young Woo、Seunghyup Yoo、Hong-Ku Shim
DOI:10.1166/jnn.2014.8788
日期:2014.8.1
We have synthesized an anthracene-based conjugated polymer, poly[(9,10-bis(oct-1-ynyl) anthracene)-alt-(5,6-bis(octyloxy)-4,7-bis(thiophen-2-yl)benzo-[c][1,2,5]-thiadiazole)] (PANTBT), for application in organic photovoltaic devices. It exhibited a number average molecular weight of 14,300 g/mol and was fairly soluble in chlorinated organic solvents due to flexible octynyl- and octyloxy side chains on the anthracene and benzothiadiazole moieties. PANTBT showed absorption covering 300–660 nm. Through the bond alternation between the electron-sufficient anthracene (and thiophene) and electron-deficient benzothiadiazole units, a band gap of PANTBT was decreased to 1.89 eV, showing a deep HOMO level of −5.31 eV. As a result, PANTBT exhibited promising photovoltaic properties with a PCE value of 1.90% (V oc = 0.77 V, J sc = −6.50 mA/cm2, FF = 0.38) upon blending with PC71BM under AM 1.5G.
我们合成了一种基于蒽的共轭聚合物,聚[(9,10-双(辛-1-炔基)蒽)-与-(5,6-双(辛氧基)-4,7-双(噻吩-2-基)苯并[c][1,2,5]-噻二唑)](PANTBT),用于有机光伏设备的应用。该聚合物的数均分子量为14,300 g/mol,并且由于蒽和苯并噻二唑部分的灵活的辛炔基和辛氧基侧链,在氯化有机溶剂中具有相当好的溶解性。PANTBT的吸收覆盖范围为300–660 nm。通过富电子的蒽(和噻吩)单元与缺电子的苯并噻二唑单元之间的键交替,PANTBT的带隙降低至1.89 eV,具有深层的HOMO能级为−5.31 eV。因此,PANTBT在与PC71BM混合后,在AM 1.5G条件下展现出良好的光伏性能,光电转换效率(PCE)值为1.90%(开路电压V oc = 0.77 V,短路电流密度J sc = −6.50 mA/cm²,填充因子FF = 0.38)。