Well-defined donor–acceptor rod–coil diblock copolymers based on P3HT containing C60: the morphology and role as a surfactant in bulk-heterojunction solar cells
作者:Changduk Yang、Jae Kwan Lee、Alan J. Heeger、Fred Wudl
DOI:10.1039/b901732a
日期:——
The synthesis of well-defined rodâcoil block copolymers consisting of P3HT donor and C60 acceptor chromophores (P3HT-b-P(SxAy)-C60) in a molecular architecture is reported for use in bulk-heterojunction (BHJ) solar cells. In thin films of the resulting block copolymer, reproducible self-assembly into well-defined ânanofibrilsâ is observed. This is the first example of a block copolymer containing a C60 derivative that shows exclusively a nanofibrilar structure. We have investigated the potential utility of the block copolymer as a âsurfactantâ for controlling the interface morphology of the P3HT:PCBM donorâacceptor phase domains within the composite. We find a substantial improvement in device performance when 5% of block copolymer are introduced to the P3HT:PCBM blend system, resulting in ca. 35% improved efficiency relative to the P3HT:PCBM solar cell fabricated without the âsurfactantâ.
据报道,在分子结构中合成了由 P3HT 供体和 C60 受体发色团 (P3HT-b-P(SxAy)-C60) 组成的明确的棒-线圈嵌段共聚物,用于本体异质结 (BHJ) 太阳能电池。在所得嵌段共聚物的薄膜中,观察到可重复的自组装成明确的“纳米原纤维”。这是含有 C60 衍生物的嵌段共聚物的第一个例子,仅显示出纳米纤维结构。我们研究了嵌段共聚物作为“表面活性剂”的潜在用途,用于控制复合材料内 P3HT:PCBM 供体-受体相域的界面形态。我们发现,当 P3HT:PCBM 共混体系中引入 5% 的嵌段共聚物时,器件性能得到显着改善,从而产生约 5% 的嵌段共聚物。相对于不使用“表面活性剂”制造的 P3HT:PCBM 太阳能电池,效率提高了 35%。