A Series of Simple Oligomer-like Small Molecules Based on Oligothiophenes for Solution-Processed Solar Cells with High Efficiency
A Series of Simple Oligomer-like Small Molecules Based on Oligothiophenes for Solution-Processed Solar Cells with High Efficiency
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一系列基于低聚噻吩的简单低聚物类小分子，用于溶液加工的高效率太阳能电池
DOI：
10.1021/jacs.5b00305
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发表时间：
2015-03-25
影响因子：
15
通讯作者：
Chen, Yongsheng
中科院分区：
文献类型：
--
作者：
Kan, Bin;Li, Miaomiao;Chen, Yongsheng
设计并合成了一系列基于低聚噻吩的受体-供体-受体简单寡聚物状小分子，即DRCN4T-DRCN9T。对它们的光学、电学、热学性质以及光伏性能进行了系统研究。除DRCN4T外，DRCN5T-DRCN9T也获得了优异的性能。基于具有轴对称化学结构的DRCN5T、DRCN7T和DRCN9T的器件表现出比基于具有中心对称化学结构的DRCN6T和DRCN8T的器件更高的短路电流密度，这归因于其特征尺寸小于20 nm的发达的纤维网络。基于DRCN5T/PC71BM的器件采用简单的溶液旋涂制造工艺，在AM 1.5G辐射(100 mW cm(-2))下显示出10.10%的经认证的功率转换效率(PCE)。这是迄今为止报道的单结小分子有机光伏 (OPV) 的最高 PCE。与迄今为止 OPV 中的所有其他高性能分子相比，DRCN5T 是一种相当简单的分子，这可能会凸显其在 OPV 未来可能商业化中的优势。这些结果表明，化学结构的精细和平衡的修改/设计可以产生显着的性能差异，并且溶液加工的小分子太阳能电池的性能可以与聚合物对应物相媲美甚至超过。
A series of acceptor-donor-acceptor simple oligomer-like small molecules based on oligothiophenes, namely, DRCN4T-DRCN9T, were designed and synthesized. Their optical, electrical, and thermal properties and photovoltaic performances were systematically investigated. Except for DRCN4T, excellent performances were obtained for DRCN5T-DRCN9T. The devices based on DRCN5T, DRCN7T, and DRCN9T with axisyrnmetric chemical structures exhibit much higher short-circuit current densities than those based on DRCN6T and DRCN8T with centrosymmetric chemical structures, which is attributed to their well-developed fibrillar network with a feature size less than 20 nm. The devices based on DRCN5T/PC71BM showed a notable certified power conversion efficiency (PCE) of 10.10% under AM 1.5G irradiation (100 mW cm(-2)) using a simple solution spin-coating fabrication process. This is the highest PCE for single-junction small-molecule-based organic photovoltaics (OPVs) reported to date. DRCN5T is a rather simpler molecule compared with all of the other high-performance molecules in OPVs to date, and this might highlight its advantage in the future possible commercialization of OPVs. These results demonstrate that a fine and balanced modification/design of chemical structure can make significant performance differences and that the performance of solution-processed small-molecule-based solar cells can be comparable to or even surpass that of their polymer counterparts.