Modulation of optical and electronic properties of quinoxailine‐based conjugated polymers for organic photovoltaic cells |
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| Authors: | Ji‐Hoon Kim Chang Eun Song Won Suk Shin BongSoo Kim In‐Nam Kang Do‐Hoon Hwang |
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| Affiliation: | 1. Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University, Busan, Republic of Korea;2. Energy Materials Research Division, Korea Research Institute of Chemical Technology, Daejeon, Republic of Korea;3. Department of Science Education, Ewha Womans University, 52, Ewhayeodae‐gil, Seodaemun‐gu, Seoul, Republic of Korea;4. Department of Chemistry, The Catholic University of Korea, Bucheon, Republic of Korea |
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| Abstract: | The synthesis of donor–acceptor type semiconducting copolymers is described. Quinoxaline (QX) or difluorinated quinoxaline (DFQX) derivatives serve as electron acceptors, while thiophene (T) or selenophene (Se) serve as electron donors. Alternating polymers are synthesized through Stille cross‐coupling, and their thermal stability, optical and electrochemical properties, field‐effect carrier mobilities, film crystallinities, and photovoltaic performances are investigated. The intramolecular charge transfer between the electron‐donating and electron‐accepting units in the backbone induces absorption from 450 to 750 nm. The optical band‐gap energies of the polymers are between 1.65 and 1.73 eV, and depend on the polymer structure. Organic photovoltaic cells fabricated using a polymer composed of DFQX and selenophene (PSe‐DFQX) exhibit a power conversion efficiency of 5.14% with an open‐circuit voltage of 0.78 V, a short‐circuit current density of 11.71 mA/cm2, and fill factor of 0.57 under AM 1.5 G irradiation (100 mW cm?2). © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015 , 53, 1904–1914 |
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| Keywords: | conjugated polymer copolymerization crystallization low band‐gap polymer quinoxaline derivative organic thin film transistors organic photovoltaic device |
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