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Solvent effects on adsorption kinetics, dye monolayer, and cell performance of porphyrin-sensitized solar cells
- Li, Wenhui, Zhu, Aili, Stewart, Adam, Liu, Zonghao, Cheng, Yi-Bing, Zhao, Zhixin, He, Hongshan
- RSC advances 2016 v.6 no.115 pp. 114037-114045
- Fourier transform infrared spectroscopy, adsorption, butanol, chemical interactions, dyes, electrodes, ethanol, mass transfer, models, nanoparticles, solar cells, solvents, titanium dioxide, ultraviolet-visible spectroscopy
- The effect of three dye loading solvents (THF, ethanol, and n-butanol) on the adsorption kinetics, the binding mode of the dye molecules on the TiO₂ nanoparticles, and photovoltaic performance in dye-sensitized solar cells was reported. The kinetic study indicated that solvents greatly affected the adsorption amount and adsorption rate on the surface of TiO₂ nanoparticles. The adsorption data in THF, ethanol and n-butanol were analyzed by applying an intraparticle diffusion model, pseudo-first order model, and pseudo-second order model, respectively. It was found that adsorption rate was controlled by mass transfer processes. UV-vis spectra and ATR-FTIR spectra of porphyrin-coated electrodes were measured to study the intermolecular interaction and binding mode on TiO₂ films, respectively. Finally, the cell performance was tested under different solvents and the best efficiency of 8.18% was obtained when n-butanol was used as the solvent for dye-loading.