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Synthesis and characterization of poly[3-(2’,5’-diheptyloxy-phenyl)thiophene] for use in photoelectrochemical cells

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Author(s): Assefa Sergawie | Shimelis Admassie | Wendimagegn Mammo | Teketel Yohannes | Theodros Solomon

Journal: Bulletin of the Chemical Society of Ethiopia
ISSN 1011-3924

Volume: 21;
Issue: 3;
Start page: 405;
Date: 2007;
Original page

Keywords: Liquid-state photoelectrochemical cell | Nanocrystalline titanium dioxide | PDHOPT | I3-/I- redox couple

ABSTRACT
Poly[3-(2',5'-diheptyloxyphenyl)thiophene], PDHOPT, has been prepared electrochemically from its monomer for solar cell application. PDHOPT exhibits a band gap of 2.1 eV. The redox properties of PDHOPT were characterized using cyclic voltammetry. The estimated energy levels of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) are -5.3 eV and -3.2 eV, respectively. PDHOPT sensitizes nanocrystalline titanium dioxide (nc-TiO2) in liquid-state photoelectrochemical cells. Devices where the photoactive electrode consists of nc-TiO2/PDHOPT composite film show improved performance over those that consist of only PDHOPT. Devices made of TiO2/PDHOPT composite film produced an open-circuit voltage of 0.52 V, a short-circuit current of 29 μA/cm2, and a fill factor of 0.54 when illuminated with white light intensity of 80 mW/cm2.
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