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Issue 28, 2010
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Thiophene-rich fused-aromatic thienopyrazine acceptor for donor–acceptor low band-gap polymers for OTFT and polymer solar cell applications

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Abstract

Thiophene enriched fused-aromatic thieno[3,4-b]pyrazine systems were designed and employed to produce low band gap polymers (Eg = 1.0–1.4 eV) when copolymerized with fluorene and cyclopentadithiophene. The copolymers are mainly investigated for organic thin film transistor and organic photovoltaic applications. Molecular packing in the thin films of these polymers was investigated using Grazing incidence X-ray Scattering. Although both fluorene and cyclopentadithiophene polymers follow similar face to face π–π stacking, the latter polymers show much smaller lamellar d-spacings due to side-chain interdigitation between the lamellae. This lead to the higher charge carrier mobilities in cyclopentadithiophene polymers (up to 0.044 cm2/V.s) compared to fluorene polymers (up to 8.1 × 10−3 cm2/V.s). Power conversion efficiency of 1.4% was achieved using fluorene copolymer in solar cells with a fullerene derivative as an acceptor. Although the cyclopentadithiophene polymers show lower band gaps with higher absorption coefficients compared to fluorene copolymers, but the power conversion efficiencies in solar cells of these polymers are low due to their low ionization potentials.

Graphical abstract: Thiophene-rich fused-aromatic thienopyrazine acceptor for donor–acceptor low band-gap polymers for OTFT and polymer solar cell applications

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Publication details

The article was received on 31 Mar 2010, accepted on 22 Apr 2010 and first published on 04 Jun 2010


Article type: Paper
DOI: 10.1039/C0JM00903B
Citation: J. Mater. Chem., 2010,20, 5823-5834
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    Thiophene-rich fused-aromatic thienopyrazine acceptor for donor–acceptor low band-gap polymers for OTFT and polymer solar cell applications

    R. Mondal, H. A. Becerril, E. Verploegen, D. Kim, J. E. Norton, S. Ko, N. Miyaki, S. Lee, M. F. Toney, J. Brédas, M. D. McGehee and Z. Bao, J. Mater. Chem., 2010, 20, 5823
    DOI: 10.1039/C0JM00903B

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