Key Laboratory for Functional Polymer Materials and Centre for Nanoscale Science and Technology, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China.
J Am Chem Soc. 2012 Oct 3;134(39):16345-51. doi: 10.1021/ja306865z. Epub 2012 Sep 25.
Small molecules, namely, DCAO(3)TBDT and DR(3)TBDT, with 2-ethylhexoxy substituted BDT as the central building block and octyl cyanoacetate and 3-ethylrhodanine as different terminal units with the same linkage of dioctyltertthiophene, have been designed and synthesized. The photovoltaic properties of these two molecules as donors and fullerene derivatives as the acceptors in bulk heterojunction solar cells are studied. Among them, DR(3)TBDT shows excellent photovoltaic performance, and power conversion efficiency as high as 7.38% (certified 7.10%) under AM 1.5G irradiation (100 mW cm(-2)) has been achieved using the simple solution spin-coating fabrication process, which is the highest efficiency reported to date for any small-molecule-based solar cells. The results demonstrate that structure fine turning could cause significant performance difference and with that the performance of solution-processed small-molecule solar cells can indeed be comparable with or even surpass their polymer counterparts.
小分子，即 DCAO(3)TBDT 和 DR(3)TBDT，以 2-乙基己氧基取代的 BDT 作为中心构建块，以辛基氰基乙酸和 3-乙基罗丹宁作为不同的端基，采用相同的二辛基噻吩连接方式。设计并合成了这两种分子作为给体和富勒烯衍生物作为受体在体异质结太阳能电池中的光伏性能。其中，DR(3)TBDT 表现出优异的光伏性能，在 AM 1.5G 照射（100 mW cm(-2))下，使用简单的溶液旋涂制造工艺，已实现高达 7.38%（经认证为 7.10%）的功率转换效率，这是迄今为止报道的任何基于小分子的太阳能电池的最高效率。结果表明，结构精细调整会导致性能差异显著，因此溶液处理的小分子太阳能电池的性能确实可以与聚合物相媲美，甚至超过聚合物。
