Institute for Problems of Chemical Physics, Russian Academy of Sciences, Semenov Prospect 1, Chernogolovka, Moscow Region, Russia.
ChemSusChem. 2010 Mar 22;3(3):356-66. doi: 10.1002/cssc.200900196.
Novel fullerene derivatives bearing thiophene and furan residues were synthesized and studied as electron acceptor materials in bulk heterojunction organic solar cells, together with poly(3-hexylthiophene) (P3HT) as the donor polymer. Some compounds showed large nanomorphological inhomogenities in blends with P3HT; in particular, clusters with dimensions in the range of 100-1000 nm were formed. However, some blends that showed such large clusters yielded at the same time high power conversion efficiencies in photovoltaic devices, approaching 3.7 %. This is in sharp contrast with previously studied systems, in which a substantial phase separation always resulted in a poor photovoltaic performance. We assume that the attachment of thienyl or furyl groups to the fullerene cage results in a certain ordering of the designed fullerene derivatives I-IX with P3HT in photoactive blends. Both the fullerene derivative and P3HT might assemble via pi-pi stacking of the thiophene units to form the nanostructures observed in the films by optical and atomic force microscopy. The presence of ordered donor and acceptor counterparts in these nanostructures results in superior photovoltaic device operation.
新型富勒烯衍生物带有噻吩和呋喃残基，被合成出来并作为电子受体材料应用于体异质结有机太阳能电池中，与聚（3-己基噻吩）（P3HT）作为供体聚合物共同使用。一些化合物在与 P3HT 的混合物中表现出较大的纳米形态不均匀性；特别是，形成了尺寸在 100-1000nm 范围内的团簇。然而，一些显示出如此大团簇的混合物同时在光伏器件中产生了高功率转换效率，接近 3.7%。这与以前研究的系统形成鲜明对比，在以前的系统中，大量的相分离总是导致光伏性能不佳。我们假设噻吩基或呋喃基与富勒烯笼的连接导致设计的富勒烯衍生物 I-IX 与光活性混合物中的 P3HT 具有一定的有序性。富勒烯衍生物和 P3HT 都可能通过噻吩单元的π-π 堆积组装成在薄膜中通过光学和原子力显微镜观察到的纳米结构。在这些纳米结构中，有序的供体和受体对应物的存在导致了优越的光伏器件操作。
