Naphtho[1,2-b:5,6-b鈥瞉dithiophene-Based Donor鈥揂cceptor Copolymer Semiconductors for High-Mobility Field-Effect Transistors and Efficient Polymer Solar Cells

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• 作者：Shaowei Shi ; Xiaodong Xie ; Pei Jiang ; Song Chen ; Liwei Wang ; Meng Wang ; Haiqiao Wang ; Xiaoyu Li ; Gui Yu ; Yongfang Li
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：May 14, 2013
• 年：2013
• 卷：46
• 期：9
• 页码：3358-3366
• 全文大小：537K
• 年卷期：v.46,no.9(May 14, 2013)
• ISSN：1520-5835

文摘

Two donor鈥揳cceptor (D鈥揂) copolymers, PzNDTDTBT and PzNDTDTBO, using 4,9-bis(2-ethylhexyloxy)naphtho[1,2-b:5,6-b鈥瞉dithiophene as an electron-rich unit and benzodiathiazole (BT) or benzoxadiazole(BO) as an electron-deficient one, were designed and synthesized via a Pd-catalyzed Stille-coupling method. The acceptor units were varied from BT to BO for adjusting the energy levels and optimizing the structures of polymers. Both copolymers possess good solubility, high thermal stability, broad absorption, and low bandgap and exhibit not only high field-effect mobilities but also high photovoltaic properties. The hole mobilities reach 0.43 and 0.34 cm² V^鈥? s^鈥? for PzNDTDTBT and PzNDTDTBO film, respectively. Bulk heterojunction solar cells fabricated by using PzNDTDTBT or PzNDTDTBO as electron donor and PC₇₁BM as acceptor show a power conversion efficiency of 3.22% and 5.07%, respectively, under illumination of AM1.5G, 100 mW cm^鈥?. Both the hole mobilities and PCEs are among the highest values in the current reports based on naphthodithiophene-based polymers, indicating that 鈥渮igzag鈥?naphthodithiophene-based D鈥揂 copolymers are very promising for application as solution-processable organic semiconductors in optoelectronic devices.