Effects of anchoring groups in multi-anchoring organic dyes with thiophene bridge for dye-sensitized solar cells
- Effects of anchoring groups in multi-anchoring organic dyes with thiophene bridge for dye-sensitized solar cells
- Yu Seok Yang; Hyung Do Kim; 류장현; 김경곤; Sung Soo Park; Kwang-Soon Ahn; Jae Hong Kim
- Dye-sensitized solar cells; Organic dyes; Multi-anchoring groups; Short-circuit current enhancement; Thiophene bridge; Structure optimization
- Issue Date
- Synthetic metals
- VOL 161, NO 9-10, 850-855
- Organic photo-sensitizers were designed and synthesized based on a phenothiazine framework containing
single- and double-electron acceptors that were bridged with thiophene for the dye sensitized solar
cells (DSSCs). The optimized geometries were determined with density functional theory (DFT) calculations
to estimate the photovoltaic properties of the dyes in the design stage. The organic dye with the
double electron acceptors exhibited a better light absorption at long wavelength and an effective electron
extraction pathway from the electron donor to the TiO2 surface, leading to an improved short-circuit current
(11.6mAcm−2), compared with that of the dye with the single electron acceptor (10.2mAcm−2) and
the conventional N3 Ru-dye (10.4mAcm−2). Contrarily, the open-circuit voltage of the organic dye with
the double electron acceptors decreased because the additional protonated carboxylic groups caused a
positive shift in the Fermi level of TiO2.
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