electron‐deficient oxadiazole. Furthermore, since oxadiazole has a larger dipole moment than BT, P‐PDT‐DFBO exhibits greater aggregation strength than previously reported for P‐PDT‐DFBT. The low‐lying HOMO level of P‐PDT‐DFBO gave about 0.1 V higher open‐circuit voltage (Voc), yielding over 0.9 V in a fabricated solar cell. From grazing incidence wide‐angle X‐ray diffraction analysis, P‐PDT‐DFBO formed a favorable
合成并表征了对二
噻吩(PDT)-二
氟苯并恶二唑(DFBO)共聚物P-PDT-DFBO。用恶二唑环取代
噻二唑可以使合成的聚合物的最高占据分子轨道(HOMO)低约0.1 V,并且与苯并
噻二唑(BT)相比,其最低未占据分子轨道能级低,这是因为电子缺乏的恶二唑。此外,由于恶二唑的偶极矩比BT大,因此P‐PDT‐DFBO的聚集强度比以前报道的P‐PDT‐DFBT大。P-PDT-DFBO的低HOMO电平使开路电压(V oc)高出约0.1 V),在人造太阳能电池中产生超过0.9 V的电压。根据掠入射的广角X射线衍射分析,P-PDT-DFBO在纯净薄膜和混合薄膜中均形成了良好的面朝取向,这表明恶二唑基团的引入可以提高V oc,而固体中的任何取向都不会改变状态。然而,基于P-PDT-DFBO的电池由于其空穴迁移率比P-PDT-DFBT低,因此其J sc和FF明显较低,因此功率转换效率较低,不大于4.43%。