A Novel Benzo[1,2-b:4,5-b鈥瞉dithiophene-Based Conjugated Polymer with a Pendant Diketopyrrolopyrrole Unit for High-Performance Solar Cells

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• 作者：Hua Tan ; Xianping Deng ; Junting Yu ; Baofeng Zhao ; Yafei Wang ; Yu Liu ; Weiguo Zhu ; Hongbin Wu ; Yong Cao
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：January 8, 2013
• 年：2013
• 卷：46
• 期：1
• 页码：113-118
• 全文大小：304K
• 年卷期：v.46,no.1(January 8, 2013)
• ISSN：1520-5835

文摘

A novel conjugated polymer of PBDT-TDPP-S was synthesized, which contains a donor unit of benzo[1,2-b:4,5-b鈥瞉dithiophene in main chain and an acceptor unit of diketopyrrolopyrrole in side chain. This kind of side-chain donor鈥揳cceptor (D鈥揂) polymer exhibited better solution processability, lower HOMO level (鈭?.34 eV), and more balanced carrier mobility relative to its corresponding main-chain D鈥揂 conjugated polymers. Using PBDT-TDPP-S as electron donor and [6,6]-phenyl-C₇₁-butyric acid methyl ester (PC₇₁BM) as electron acceptor, the resulting polymer solar cells exhibited outstanding photovoltaic properties with a power conversion efficiency of 4.89%, an open-circuit voltage of 0.84 V, a short-circuit current of 10.04 mA cm^鈥?, and a fill factor of 56.0%.