Organic Photosensitizers Based on Terthiophene with Alkyl Chain and Double Acceptors for Application in Dye-Sensitized Solar Cells

Title
Organic Photosensitizers Based on Terthiophene with Alkyl Chain and Double Acceptors for Application in Dye-Sensitized Solar Cells
Author(s)
원용선[원용선]양유석[양유석]김재홍류장현[류장현]김경곤[김경곤]박성수[박성수]
Keywords
CONVERSION EFFICIENCY; MOLECULAR DESIGN; TIO2 FILMS; OLIGOTHIOPHENES; CONJUGATION
Issue Date
201005
Publisher
AMER CHEMICAL SOC
Citation
ENERGY & FUELS, v.24, pp.3676 - 3681
Abstract
We designed and synthesized organic photosensitizers carrying terthiophene as the electron donor and cyanoacrylic acid as the electron acceptor for application in dye-sensitized solar cells (DSSCs). The photovoltaic performances of the DSSCs based on these dyes markedly depended on the molecular structures of the dyes in terms of the intermolecular interaction and the length of pi conjugation. The suppressed intermolecular interaction with the presence of n-hexyl chain linked to thiophene gave rise to an enhanced electron transfer. Meanwhile, the Structure with double electron acceptors of cyanoacrylic acid increased the dye adsorption on the TiO(2) surface and the length of pi conjugation. As a result, an apparent improvement of photocurrent (short circuit current; J(sc)) and power conversion efficiency was achieved upon the addition of n-hexyl chain and double cyanoacrylic acids to the terthiophene moiety. These dyes, however, had inferior performances (eta similar to 2.0%) in general, despite the apparent advantages such as broad and intense absorption spectra in the visible region. This is attributed to the ineffective electron injection to TiO(2) due to their inherent low lowest unoccupied molecular orbital (LUMO) levels, probably down to the conduction band edge of TiO(2).
URI
http://hdl.handle.net/YU.REPOSITORY/22459http://dx.doi.org/10.1021/ef100429r
ISSN
0887-0624
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공과대학 > 화학공학부 > Articles
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