We have synthesized a new series of donorâacceptorâdonor (DâAâD) Ï-conjugated molecules, consisting of fluorenone core end-capped with dendritic oligo(thiophene)s of increasing generation (abbreviated as FG0, FG1, and FG2). In view of the application of these new organic semiconductors in photovoltaic devices, we have explored their spectroscopic, redox, and structural properties. The thermal behaviour of the new organic semiconductors was investigated by differential scanning calorimetry and polarized-light optical microscopy. Liquid crystalline behaviour has been found in the case of FG1, corresponding to a smectic ordering with a triclinic symmetry (Smobl) upon heating, as confirmed by variable temperature small-angle X-ray diffraction studies. In order to evaluate their photovoltaic performances, devices with an active area of 0.28 cm2 were fabricated. Under AM1.5 simulated sunlight (100 mW cmâ2) conditions, a device containing FG1/[70]PCBM blends showed a power conversion efficiency of ca. 0.8%.
我们合成了一系列新的供体-受体-供体(D-A-D)Β-共轭分子,由
芴酮核心和枝状低聚(
噻吩)末端封端组成,低聚(
噻吩)的世代数不断增加(分别简写为FG0、FG1和FG2)。鉴于这些新型有机半导体在光伏器件中的应用,我们对其光谱、氧化还原和结构特性进行了研究。通过差示扫描量热法和偏振光光学显微镜研究了新型有机半导体的热行为。在FG1的情况下发现了液晶行为,在加热时与具有三斜对称性的层状有序(Smobl)相对应,这一点得到了可变温度小角X射线衍射研究的证实。为了评估其光伏性能,我们制造了有效面积为0.28 cm2的器件。在
AM1.5模拟太阳光(100 mW cm-2)条件下,含有FG1/[70]PCBM混合物的器件的功率转换效率约为0.8%。