Dithienosilole-Based Small-Molecule Organic Solar Cells with an Efficiency over 8%: Investigation of the Relationship between the Molecular Structure and Photovoltaic Performance

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• 作者：Wang Ni ; Miaomiao Li ; Feng Liu ; Xiangjian Wan ; Huanran Feng ; Bin Kan ; Qian Zhang ; Hongtao Zhang ; Yongsheng Chen
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：September 8, 2015
• 年：2015
• 卷：27
• 期：17
• 页码：6077-6084
• 全文大小：509K
• ISSN：1520-5002

文摘

Two new acceptor鈥揹onor鈥揳cceptor (A-D-A) small molecules with 2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b鈥瞉-dithiophene (DTC) and (4,4鈥?bis(2-ethylhexyl) dithieno[3,2-b:2鈥?3鈥?d]silole)鈥?,6-diyl (DTS) as the central building block unit and 3-ethyl-rhodanine as the end-capping groups have been designed and synthesized. The influence of the bridging atoms on the optical, electrochemical properties, packing properties, morphology, and device performance of these two molecules was systematically investigated. Although with only the difference of one atom on the central core units, the two molecules showed great different properties such as film absorption, molecular packing, and charge transport properties. The optimized device based on molecule DR3TDTS exhibited a power conversion efficiency (PCE) of >8%.