纳米棒
材料科学
堆积
超分子化学
化学工程
单体
异质结
氢键
富勒烯
甲苯
退火(玻璃)
纳米技术
聚合物
结晶学
晶体结构
分子
有机化学
光电子学
化学
复合材料
工程类
作者
Shiki Yagai,Mika Suzuki,Lin Xu,Marina Gushiken,Takuya Noguchi,Takashi Karatsu,Akihide Kitamura,Akinori Saeki,Shu Seki,Yoshihiro Kikkawa,Yuki Tani,Ken‐ichi Nakayama
标识
DOI:10.1002/chem.201404428
摘要
Abstract Supramolecular rosettes of oligothiophenes that do not bear long aliphatic tails have been designed as semiconducting nanomaterials for solution‐processable bulk heterojunction solar cells. The rosettes consist of six barbiturated thienyl[oligo(hexylthiophene)] units (Bar‐T‐hT n ; n =3,4,5) aggregated by multiple hydrogen bonds, which have been directly visualized by scanning tunneling microscopy (STM) at a solid–liquid interface. 1 H NMR spectroscopy in [D 8 ]toluene showed that Bar‐T‐hT n exists as a mixture of monomers and small hydrogen‐bonded aggregates. Hierarchical organization of the hydrogen‐bonded aggregates took place through π–π stacking interactions upon casting their toluene solutions, resulting in the growth of highly ordered nanorods whose widths are consistent with the diameters of the rosettes. The nanorods could be generated in the presence of soluble fullerene derivatives via solution casting or the annealing of the resulting thin films. The solar cells fabricated based on these bulk heterojunction films showed power conversion efficiencies of 1–3 %, which are far higher than those of the non‐hydrogen‐bonded reference oligothiophene and the derivative that possesses long aliphatic tails.
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