Improved Synthesis of Thienothiazole and Its Utility in Developing Polymers for Photovoltaics

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• 作者：Rycel Uy ; Liqiang Yang ; Huaxing Zhou ; Samuel C. Price ; Wei You
• 刊名：Macromolecules
• 出版年：2011
• 出版时间：December 13, 2011
• 年：2011
• 卷：44
• 期：23
• 页码：9146-9154
• 全文大小：1091K
• 年卷期：v.44,no.23(December 13, 2011)
• ISSN：1520-5835

文摘

In response to the structural and electronic limitations of the popular benzo[1,2-b:4,5-b鈥瞉dithiophene鈥搕hieno[3,4-b]thiophene (PBnDT鈥揟T) polymer series, this study explores the design and synthesis of a thienothiazole (TTz) moiety. The synthesis of TTz was streamlined down to four high-yielding steps, resulting in the new polymer PBnDT鈥揟Tz for organic solar cells. By incorporating TTz, a nitrogen is directly introduced into the polymer backbone which tunes the HOMO level and eliminates the reliance on external substituents. Compared to its TT analogue, PBnDT鈥揟Tz exhibits the same HOMO level of 鈭?.06 eV and the same V_oc of 0.69 eV, yet a higher power conversion efficiency of 2.5%. These promising results demonstrate the benefits of backbone modification and the great potential of TTz in the design of new polymers for organic photovoltaics.