Park, Se Woong Son, Kyung-In Ko, Min Jae Kim, Kyungkon Park, Nam-Gyu 2024-01-20T20:04:51Z 2024-01-20T20:04:51Z 2021-09-05 2009-12 0379-6779 https://pubs.kist.re.kr/handle/201004/131916 This paper describes the effects of donating ability in a D (donor)-pi-A (acceptor) structured organic dye on the HOMO and LUMO energy levels and photovoltaic performance in dye-sensitized solar cell. Two different dyes were synthesized based on the cyanoacetic acid as an acceptor and the phenyl-thiophene as a pi-conjugated bridge, where one contains a diethyl amino group (P2) and the other has an ethoxy group (P5) as the donor. The HOMO-LUMO energy gap was significantly influenced by donor group, where change of ethoxy donor with stronger amino one in donating ability decreased the energy gap from 2.84 eV to 2.21 eV. Moreover, it was also found that HOMO energy level was more sensitive to change in donor group than LUMO one. Photovoltaic performances of P2- and P5-dye-sensitized solar cells were systematically investigated in terms of the effects of co-adsorbent concentration, TiO2 film thickness and TiCl4 post-treatment. Under the best condition, the P5 dye showed the conversion efficiency of 2.62%, while the P2 dye exhibited much higher efficiency of 5.89% due to broader absorption. (C) 2009 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA NANOCRYSTALLINE TIO2 FILMS SOLAR-CELLS CONVERSION EFFICIENCY COUMARIN DYES THIOPHENE PERFORMANCE COMPLEXES Effect of donor moiety in organic sensitizer on spectral response, electrochemical and photovoltaic properties Article 10.1016/j.synthmet.2009.09.013 1 SYNTHETIC METALS, v.159, no.23-24, pp.2571 - 2577 SYNTHETIC METALS 159 23-24 2571 2577 scie scopus 000273927600026 2-s2.0-71649101413 Materials Science, Multidisciplinary Physics, Condensed Matter Polymer Science Materials Science Physics Polymer Science Article NANOCRYSTALLINE TIO2 FILMS SOLAR-CELLS CONVERSION EFFICIENCY COUMARIN DYES THIOPHENE PERFORMANCE COMPLEXES Electron donor Dye-sensitized Solar cell Photovoltaics HOMO-LUMO energy tuning Metal-free organic sensitizer