A Facile Synthesis of Low-Band-Gap Donor鈥揂cceptor Copolymers Based on Dithieno[3,2-b:2鈥?3鈥?d]thiophene

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• 作者：Sung-Yu Ku ; Christopher D. Liman ; Daniel J. Burke ; Neil D. Treat ; Justin E. Cochran ; Elizabeth Amir ; Louis A. Perez ; Michael L. Chabinyc ; Craig J. Hawker
• 刊名：Macromolecules
• 出版年：2011
• 出版时间：December 27, 2011
• 年：2011
• 卷：44
• 期：24
• 页码：9533-9538
• 全文大小：891K
• 年卷期：v.44,no.24(December 27, 2011)
• ISSN：1520-5835

文摘

A facile and scalable synthetic route to a soluble dithieno[3,2-b:2鈥?3鈥?d]thiophene (DTT) unit has been developed, which utilizes a Stille coupling reaction to efficiently synthesize the bisthienyl sulfide intermediate. This simplifies the overall DTT synthesis to only four steps with a 44% yield and facilitates its use as a donor unit in low-band-gap polymers. Solution processable alternating D-蟺鈥揂-蟺 polymers (DTTBTO and DTTDPP) have been synthesized with DTT as the donor unit and either a benzothiodiazole derivative (BTO) or fused ring 1,4-diketopyrrolo[3,4-c]pyrrole (DPP) serving as the acceptor unit. The ability to tailor the structure of these donor鈥揳cceptor systems permits a detailed understanding of structure/property relationships for band-gap engineering, absorbance, V_oc, and efficiency to be developed and applied to the design of high-performance organic solar cells.