Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 53, Issue 16, Pages 1904-1914Publisher
WILEY
DOI: 10.1002/pola.27642
Keywords
conjugated polymer; copolymerization; crystallization; low band-gap polymer; quinoxaline derivative; organic thin film transistors; organic photovoltaic device
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Funding
- Center for Advanced Soft Electronics - Ministry of Science, ICT and Future Planning as a Global Frontier Project [CASE-2014M3A6A5060936]
- National Research Foundation (NRF) - Korean government [NRF-2014R1A2A2A01007318, 2011-0030013]
- National Research Foundation of Korea [2013H1A2A1033895, 2014M3A6A5060936, 2014R1A2A2A01007318] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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/cm(2), and fill factor of 0.57 under AM 1.5 G irradiation (100 mW cm(-2)). (c) 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015, 53, 1904-1914
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