due to their electron-rich properties and small volume compared with benzene unit. On the other hand, weakening coplanarity of dye with benzene bridge contributes to the antiaggregation and accordingly increase VOC, though decreases photo-generated current. Among three dyes, dye with furan bridge achieves the optimal photovoltaic performance 7.67% due to the highest JSC 15.45 mA cm−2.
合成了三种苯并
咔唑染料,其中N-丁基苯并
咔唑为电子供体,苯,
呋喃和
噻吩为π-桥,
氰基
丙烯酸为电子受体。研究了它们的光物理性质和光伏性能,并在三个π桥之间进行了比较。与苯单元相比,
噻吩或
呋喃单元的结合通过减少能隙和改善分子共轭作用,有利于分子内电荷转移,这是由于它们的富电子特性和较小的体积。另一方面,减弱
染料与苯桥的共平面性有助于抗聚集,从而增加V OC,虽然会降低光生电流。在三种
染料中,带有
呋喃桥的
染料由于具有最高的J SC 15.45 mA cm -2,因此可实现最佳的光伏性能7.67%。