4.7 Article

The effect of benzoxazole unit on the properties of cyclic thiourea functionalized triphenylamine dye sensitizers

Journal

DYES AND PIGMENTS
Volume 187, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2020.109093

Keywords

Dye-sensitized solar cells; Benzoxazole; D-pi-A-A; Dipole moment; Dye sensitizer

Funding

  1. National Science Foundation Committee of China [21673134]
  2. Program for Science & Technology Innovation Team of Shaanxi Province [2018TD030]

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The study investigated the effects of benzoxazole groups at different positions on the properties of dye sensitizers. It was found that D-pi-A-A dyes showed superior light absorption and photovoltaic efficiency compared to D-A-pi-A dyes.
Two D-pi-A-A sensitizers (AZ6-B20 and AZ6-B21) were synthesized by inserting the benzoxazole group as an auxiliary acceptor between the pi-linker and the acceptor. And a D-A-pi-A sensitizer (AZ6-B19) was also synthesized in our previous works by the insertion of the benzoxazole between the donor and the pi-linker. The effects of benzoxazole groups on the properties at different sites of dye sensitizers were distinguishing. Their light harvest abilities were investigated by UV-vis spectra both in the solution and on the films. The results show that the absorption bands of UV-vis spectra are quite different from D-A-pi-A and D-pi-A-A dyes. The much more intensive molar extinction coefficients (53807 M-1 cm(-1) and 52555 M-1 cm(-1)) were observed at around 575 nm for D-pi-A-A dyes. The photovoltaic properties of DSSCs were also evaluated by J-V curves and IPCE measurements. The results confirmed that D-pi-A-A dyes delivered high photovoltaic efficiency (AZ6-B20: 7.48%, AZ6-B21: 8.67%) compared with that of D-A-pi-A dye (AZ6-B19: 3.27%). The details on the relation of the structures/ properties were discussed by the optical physical absorption, electrical chemical measurements and DFT calculations.

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