Journal
SYNTHETIC METALS
Volume 161, Issue 9-10, Pages 850-855Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2011.02.012
Keywords
Dye-sensitized solar cells; Organic dyes; Multi-anchoring groups; Short-circuit current enhancement; Thiophene bridge; Structure optimization
Funding
- Ministry of Education, Science and Technology (MEST) [2010-0017088]
- National Research Foundation of Korea(NRF)
- National Research Foundation of Korea [20090305141626, 과C6B1910] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 (11.6 mA cm(-2)), compared with that of the dye with the single electron acceptor (10.2 mA cm(-2)) and the conventional N3 Ru-dye (10.4 mA cm(-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. (C) 2011 Elsevier B.V. All rights reserved.
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