Effect of Chalcogens on Electronic and Photophysical Properties of Vinylene-Based Diketopyrrolopyrrole Copolymers

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• 作者：Joydeep Dhar ; Tushita Mukhopadhay ; Nir Yaacobi-Gross ; Thomas D. Anthopoulos ; Ulrike Salzner ; Sufal Swaraj ; Satish Patil
• 刊名：Journal of Physical Chemistry B
• 出版年：2015
• 出版时间：August 27, 2015
• 年：2015
• 卷：119
• 期：34
• 页码：11307-11316
• 全文大小：625K
• ISSN：1520-5207

文摘

Three vinylene linked diketopyrrolopyrrole based donor鈥揳cceptor (D鈥揂) copolymers have been synthesized with phenyl, thienyl, and selenyl units as donors. Optical and electronic properties were investigated with UV鈥搗is absorption spectroscopy, cyclic voltammetry, near edge X-ray absorption spectroscopy, organic field effect transistor (OFET) measurements, and density functional theory (DFT) calculations. Optical and electrochemical band gaps decrease in the order phenyl, thienyl, and selenyl. Only phenyl-based polymers are nonplanar, but the main contributor to the larger band gap is electronic, not structural effects. Thienyl and selenyl polymers exhibit ambipolar charge transport but with higher hole than electron mobility. Experimental and theoretical results predict the selenyl system to have the best transport properties, but OFET measurements prove the thienyl system to be superior with p-channel mobility as high as 0.1 cm² V^鈥? s^鈥?.