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A low energy gap and fully regioregular poly(3-Dodecyl-2,5-thienylenevinylene) for photovoltaics
Author(s): Cheng Zhang; Taina Matos; Shahin Maaref; Eric Annih; Sam-Shajing Sun; Jian Zhang; Xiaomei Jiang
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Paper Abstract

We report the development of a fully regioregular Poly(3-Dodecyl-2,5-thienylenevinylene) (HT-HT PDDTV) using the Horner-Emmons reaction, and studies using proton and carbon NMR spectroscopy, UV-vis absorption spectroscopy, fluorescence spectroscopy, cyclovoltametry, thermal analysis (DSC & TGA) and XRD. The HT-HT PDDTV developed has practically no solubility in boiling hexane, in sharp contrast to the literature PDDTV prepared from the Stille coupling reaction, which is mostly soluble in hexanes (an indication of high content of structural defects). The optical energy gaps are 1.80 eV in chloroform solution and 1.65 eV in film. The HOMO/LUMO of the film were -5.03 eV and -3.63eV, respectively. The electrochemical energy gap in the film is 1.4 eV. XRD study shows that a decent crystalline structure was formed without any annealing of the as-cast films. The lamellar sheets (formed from π. π. stacking) preferentially are oriented in parallel to the substrate surface with an interlayer spacing of 17.6 angstrom.

Paper Details

Date Published: 27 August 2008
PDF: 11 pages
Proc. SPIE 7052, Organic Photovoltaics IX, 70520Y (27 August 2008); doi: 10.1117/12.795450
Show Author Affiliations
Cheng Zhang, Norfolk State Univ. (United States)
Taina Matos, Norfolk State Univ. (United States)
Shahin Maaref, Norfolk State Univ. (United States)
Eric Annih, Norfolk State Univ. (United States)
Sam-Shajing Sun, Norfolk State Univ. (United States)
Jian Zhang, Univ. of South Florida (United States)
Xiaomei Jiang, Univ. of South Florida (United States)

Published in SPIE Proceedings Vol. 7052:
Organic Photovoltaics IX
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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