Donor-acceptor copolymer based on dioctylporphyrin: Synthesis and application in organic field-effect transistors

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• 作者：Xiaochen Wang^a ; Yugeng Wen^b ; Hao Luo^b ; Gui Yu^b ; ^{yug@iccas.ac.cn} ; Xiaoyu Li^a ; ^{lixy@mail.buct.edu.cn} ; Yunqi Liu^b ; ^{liuyq@iccas.ac.cn} ; Haiqiao Wang^a ; ^{wanghaiqiao@mail.buct.edu.cn}
• 关键词：Porphyrin ; Doctor-acceptor copolymer ; Organic field-effect transistors
• 刊名：Polymer
• 出版年：2012
• 期刊代码：83_00323861
• 类别：ms
• 出版时间：17 April, 2012
• 卷：53
• 期：9
• 页码：1864-1869
• 文件大小：729 K

摘要

A novel alternating D-A copolymer, PPor-BT, with dioctylporphyrin (Por) as a donor unit and 5,6-bis(octyloxy)benzo-2,1,3-thiadiazole (BT) as an acceptor unit, was designed and synthesized by Pd-catalyzed Sonogashira-coupling reaction. The copolymer showed good solubility and film-forming ability. PPor-BT exhibited a broad absorption band from 350 to 950聽nm with two peaks centered at 456 and 818聽nm corresponding to the Soret band and Q-bands absorption of porphyrin segments, respectively. The employment of electron deficient BT unit to construct donor-acceptor structure observably broadened the absorption spectrum and enhanced the Q-band absorption of the porphyrin-based polymer. The HOMO and LUMO energy levels of the polymer are聽鈭?.06聽eV and聽鈭?.63聽eV, respectively. The solution-processed organic field-effect transistors (OFETs) were fabricated with bottom gate/top-contact geometry. The mobility of PPor-BT based OFEFs reached 4.3聽脳聽10^鈭?聽cm²聽V^鈭?聽s^鈭? with an on/off current ratio of 10⁴. This mobility is among the highest values for porphyrin-based polymers.