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Issue 47, 2010
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Fused aromatic thienopyrazines: structure, properties and function

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Recent development of a fused aromatic thieno[3.4-b]pyrazine system and their application in optoelectronic devices are reviewed. Introduction of a fused aromatic unit followed by side chain engineering, dramatically enhanced the charge carrier mobility in thin film transistor devices and mobilities up to 0.2 cm2/Vs were achieved. The optoelectronic properties of these fused aromatic thienopyrazine polymers (Eg = 1.3 to 1.6 eV, HOMO = −4.9 to −5.2 V) were tuned by introduction of various fused aromatic rings within thienopyrazine. By balancing the fundamental properties of these polymers, both high charge carrier mobilities and moderate PCEs in solar cells were achieved. Further, effects of copolymerizing units are discussed. Low band gap semiconducting polymer (Eg ∼ 1 eV) with high field effect mobility (0.044 cm2/Vs) was obtained using cyclopentadithiophene as copolymerizing unit. Finally, a molecular design approach to enhance the absorption coefficients is discussed, which resulted in improved power conversion efficiency in bulk heterojunction solar cells.

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The article was received on 09 Jun 2010, accepted on 05 Aug 2010 and first published on 26 Aug 2010

Article type: Highlight
DOI: 10.1039/C0JM01840F
J. Mater. Chem., 2010,20, 10568-10576

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    Fused aromatic thienopyrazines: structure, properties and function

    R. Mondal, S. Ko and Z. Bao, J. Mater. Chem., 2010, 20, 10568
    DOI: 10.1039/C0JM01840F

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