Effect of Co-sensitization of Dyes with Different Acceptor Moieties for Dye-sensitized Solar Cells

doi:10.7517/issn.1674-0475.190528

Abstract

Abstract: In order to broaden the response range of dye-sensitized solar cells to the solar spectrum and improve the photovoltaic performance of the cells, two triphenylamine dyes (TR1 and TC1) containing different acceptor moieties (rhodanine-3-acetic acid (RA) and cyanoacrylic acid (CA)) were co-sensitized. The TR1 dyes adsorbed on TiO₂ surface with a lied down mode, while the TC1 dyes with a standing adsorption mode. When the two dyes were co-sensitized on TiO₂ in different molar ratios, TC1 would occupy part of the positions of TR1, which could expand the spectrum and inhibit the charge recombination at the same time. The electron lifetime of the co-sensitized solar cell device was longer than that of TR1-sensitized solar cell. Finally, the co-sensitized device sensitized by co-sensitizer solution in which the molar ratio of TR1 to TC1 is 5:5 yielded short-circuit photocurrent density (J_sc) of 11.7 mA/cm², open circuit voltage (V_oc) of 704 mV, fill factor (FF) of 0.73 and the highest efficiency of 6.03%. This performance is superior to those of solar cell devices sensitized by the two dyes individually.

Key words: dye-sensitized solar cells, co-sensitization, triphenylamine dyes, photovoltaic performance, impedance

ZHAO Xue, PEI Juan, LI Yingpin. Effect of Co-sensitization of Dyes with Different Acceptor Moieties for Dye-sensitized Solar Cells[J]. Imaging Science and Photochemistry, 2019, 37(6): 525-535.

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