Diketopyrrolopyrrole鈥揟hiophene鈥揃enzothiadiazole Random Copolymers: An Effective Strategy To Adjust Thin-Film Crystallinity for Transistor and Photovoltaic Properties

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• 作者：Hui Li ; Fangbin Liu ; Xuedong Wang ; Chunling Gu ; Ping Wang ; Hongbing Fu
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：December 10, 2013
• 年：2013
• 卷：46
• 期：23
• 页码：9211-9219
• 全文大小：631K
• 年卷期：v.46,no.23(December 10, 2013)
• ISSN：1520-5835

文摘

Three new low bandgap conjugated random copolymers, containing two acceptors diketopyrrolopyrrole (DPP) and benzothiadiazole (BTD) linked by thiophene donors, were designed and synthesized using Pd-catalyzed Stille-coupling methods. The ratio between DPP and BTD was varied from N = 3:7 to 1:1 to 7:3 in the polymer backbones. Thin-film device measurements indicate that these polymers exhibit different trends in field-effect mobilities and photovoltaic properties owing to adjustable nanoscale film morphologies as well as solid-state molecular packing. The hole mobilities reach 0.05, 0.17, and 0.40 cm² V^鈥? s^鈥? for N = 3:7, 1:1, and 7:3 copolymers while bulk heterojuction solar cells fabricated by using N = 3:7, 1:1, and 7:3 copolymers as donor and PC₆₀BM as acceptor show power conversion efficiency of 2.4%, 1.3%, and 0.5%. This work sets up a good example of effectively tuning the crystallinity of thin-film device through easily varying the composition ratios.