Donor–Acceptor Conjugated Polymers Based on Dithieno[3,2-b:3′,2′-b′]naphtho[1,2-b:5,6-b′]dithiophene: Synthesis and Semiconducting Properties

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• 作者：Mu He ; Weili Li ; Yao Gao ; Hongkun Tian ; Jidong Zhang ; Hui Tong ; Donghang Yan ; Yanhou Geng ; Fosong Wang
• 刊名：Macromolecules
• 出版年：2016
• 出版时间：February 9, 2016
• 年：2016
• 卷：49
• 期：3
• 页码：825-832
• 全文大小：623K
• ISSN：1520-5835

文摘

A polycyclic aromatic unit comprising six rings, i.e., 5,11-bis(2-octyldodecyl)dithieno[3,2-b:3′,2′-b′]naphtho[1,2-b:5,6-b′]dithiophene (DTNDT), was developed. Four donor–acceptor (D–A) conjugated polymers, which are named P-BT, P-2FBT, P-IID, and P-DPP, were synthesized with DTNDT as the D-unit and 2,1,3-benzothiadiazole (BT), 5,6-difluorobenzo[c][1,2,5]thiadiazole (2FBT), isoindigo (IID), and diketopyrrolopyrrole (DPP) as the A-unit, respectively. All four polymers are thermally stable with decomposition temperature above 390 °C and show pseudo-straight-shaped backbones. Their ordered thin films were prepared via solution spin-casting, in which conjugated backbones mainly adopted edge-on alignment on the substrate. The semiconducting properties of the polymers were characterized with bottom gate and top contact (BGTC) organic thin film transistors (OTFTs). All four polymers showed p-type transport behavior, and the hole mobilities were 0.023, 0.078, 0.50, and 1.80 cm²/(V s) for P-BT, P-2FBT, P-IID, and P-DPP, respectively. P-DPP exhibited the highest film order, a short π–π stacking distance (3.52 ?), and therefore the highest device mobility.