Alternating Copolymers of Carbazole and Triphenylamine with Conjugated Side Chain Attaching Acceptor Groups: Synthesis and Photovoltaic Application

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• 作者：Zhi-Guo Zhang ; Yi-Liang Liu ; Yang Yang ; Keyue Hou ; Bo Peng ; Guangjin Zhao ; Maojie Zhang ; Xia Guo ; En-Tang Kang ; Yongfang Li
• 刊名：Macromolecules
• 出版年：2010
• 出版时间：November 23, 2010
• 年：2010
• 卷：43
• 期：22
• 页码：9376-9383
• 全文大小：858K
• 年卷期：v.43,no.22(November 23, 2010)
• ISSN：1520-5835

文摘

Four alternating copolymers of carbazole (Cz) and triphenylamine (TPA) with thienylene-vinylene (TV) conjugated side chain containing different acceptor end groups of aldehyde (PCzTPA−TVCHO), monocyano (PCzTPA−TVCN) dicyano (PCzTPA−TVDCN), and 1,3-diethyl-2-thiobarbituric acid (PCzTPA−TVDT), have been designed and synthesized. The structures and properties of the main chain donor-side chain acceptor D−A copolymers were fully characterized. Through changing the acceptor group attached to the TV conjugated side chain on TPA, the electronic properties and energy levels of the copolymers were effectively tuned. The effect of substituent on the electronic structures of the copolymers was also studied by molecular simulation. These results indicate that it is a simple and effective approach to tune the bandgap in a conjugated polymer by attaching an acceptor end group on the conjugated side chains. PCzTPA−TVCN, PCzTPA−TVDCN, and PCzTPA−TVDT were used as donor in polymer solar cells; the device based on PCzTPA−TVDT/PC₇₀BM demonstrates a power conversion efficiency of 2.76% with V_oc of 0.87 V under the illumination of AM1.5G, 100 mW/cm².