Low Band Gap Polymers Incorporating a Dicarboxylic Imide-Derived Acceptor Moiety for Efficient Polymer Solar Cells

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• 作者：Lixin Wang ; Dongdong Cai ; Qingdong Zheng ; Changquan Tang ; Shan-Ci Chen ; Zhigang Yin
• 刊名：ACS Macro Letters
• 出版年：2013
• 出版时间：July 16, 2013
• 年：2013
• 卷：2
• 期：7
• 页码：605-608
• 全文大小：298K
• 年卷期：v.2,no.7(July 16, 2013)
• ISSN：2161-1653

文摘

Two novel copolymers incorporating N-alkyl-4,7-di(thien-2-yl)-2,1,3-benzothiadiazole-5,6-dicarboxylic imide (DI) and benzo[1,2-b:4,5-b鈥瞉dithiophene (BDT) units have been designed, synthesized, and characterized. By the incorporation of the DI unit, both polymers show a bathochromically shifted absorption with a deep lying highest occupied molecular orbital (HOMO) energy level. The polymer based on thienyl group substituted BDT exhibits an intense absorption in the longer-wavelength region, a deeper lying HOMO energy level, and a higher carrier mobility, all of which contribute to the resulting polymer solar cells with a higher power conversion efficiency (PCE) of 5.19% and an increased V_oc of 0.91 V.