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Modulation of optical and electronic properties of quinoxailine-based conjugated polymers for organic photovoltaic cells

Title
Modulation of optical and electronic properties of quinoxailine-based conjugated polymers for organic photovoltaic cells
Authors
Kim, Ji-HoonSong, Chang EunShin, Won SukKim, BongSooKang, In-NamHwang, Do-Hoon
Ewha Authors
김봉수
SCOPUS Author ID
김봉수scopus
Issue Date
2015
Journal Title
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
ISSN
0887-624XJCR Link1099-0518JCR Link
Citation
vol. 53, no. 16, pp. 1904 - 1914
Keywords
conjugated polymercopolymerizationcrystallizationlow band-gap polymerquinoxaline derivativeorganic thin film transistorsorganic photovoltaic device
Publisher
WILEY-BLACKWELL
Indexed
SCI; SCIE; SCOPUS WOS scopus
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/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
DOI
10.1002/pola.27642
Appears in Collections:
사범대학 > 과학교육과 > Journal papers
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