Small molecules based on benzo[1,2-b:4,5-b']dithiophene unit for high-performance solution-processed organic solar cells.
Small molecules based on benzo[1,2-b:4,5-b']dithiophene unit for high-performance solution-processed organic solar cells.
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DOI：
10.1021/ja306865z
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发表时间：
2012-09
影响因子：
15
通讯作者：
Jiao-yan Zhou;Xiangjian Wan;Yongsheng Liu;Yi Zuo;Zhi Li;Guangrui He;Guankui Long;Wang Ni;
中科院分区：
文献类型：
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作者：
Jiao-yan Zhou;Xiangjian Wan;Yongsheng Liu;Yi Zuo;Zhi Li;Guangrui He;Guankui Long;Wang Ni;
设计合成了以2-乙基己氧基取代的BDT为中心结构单元，氰基乙酸辛酯和3-乙基绕丹宁为末端单元，以二辛基叔噻吩为连接基的DCAO（3）TBDT和DR（3）TBDT小分子.研究了这两种分子作为施主和富勒烯衍生物作为受主在体异质结太阳能电池中的光伏特性。其中，DR（3）TBDT显示出优异的光伏性能，并且使用简单的溶液旋涂制造工艺在AM 1.5G照射（100 mW cm（-2））下实现了高达7.38%的功率转换效率（认证为7.10%），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，结构的精细化会导致电池性能的显著差异，溶液加工的小分子太阳能电池的性能可以与聚合物电池相当甚至超过聚合物电池。
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.