Synthesis and Photovoltaic Properties of Copolymers Based on Benzo[1,2-b:4,5-b鈥瞉dithiophene and Thiophene with Different Conjugated Side Groups

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• 作者：Zhaojie Gu ; Peng Tang ; Bin Zhao ; Hao Luo ; Xia Guo ; Huajie Chen ; Gui Yu ; Xinping Liu ; Ping Shen ; Songting Tan
• 刊名：Macromolecules
• 出版年：2012
• 出版时间：March 13, 2012
• 年：2012
• 卷：45
• 期：5
• 页码：2359-2366
• 全文大小：405K
• 年卷期：v.45,no.5(March 13, 2012)
• ISSN：1520-5835

文摘

Three novel copolymers (PT-ID, PT-DTBT, and PT-DTBTID) of benzo[1,2-b:4,5-b鈥瞉dithiophene and thiophene with different conjugated side groups (1,3-indanedione (ID), 4,7-dithien-5-yl-2,1,3-benzodiathiazole (DTBT), and DTBT-ID) were synthesized and developed for polymer solar cell applications. The effects of the different conjugated side groups on the thermal, photophysical, electrochemical and photovoltaic properties of these copolymers were investigated. As the length of the conjugated side groups increased, the absorption of the UV鈥搗is region in solution was red-shifted. By changing the different side groups, the energy levels and band gaps of the resulted copolymers were effectively tuned. The three copolymers exhibit deep HOMO energy level and relatively high open-circuit voltage (V_oc). Bulk heterojunction solar cells with these copolymers as electron donors and (6,6)-phenyl-C₆₁-butyric acid methyl ester (PC₆₁BM) as an electron acceptor exhibit power conversion efficiencies of 2.48%, 4.18% and 1.16% for PT-ID, PT-DTBT, and PT-DTBTID, respectively.