title: Improved performance of dye-sensitized solar cells using gallium nitride-titanium dioxide composite photoelectrodes.
abstract: Dye-sensitized solar cells (DSSCs) are fabricated with gallium nitride-titanium dioxide (GaN-TiO2) composite photoelectrodes to enhance the power conversion efficiency. The value of power conversion efficiency increases with the incorporation of GaN in TiO2 matrix and reaches a maximum at 0.05 wt% GaN. Internal resistance in the DSSC is characterized by electrochemical impedance spectroscopy (EIS). From the EIS of electrolyte/dye/GaN-TiO2 interface resistances under illumination and in the dark, a decrease in the charge transfer resistance and an increase in the charge recombination resistance of the DSSCs are obtained after the inclusion of GaN (0.01-0.05 wt%) in the TiO2 matrix. The power conversion efficiency of the DSSC based on the GaN (0.05 wt%)-TiO2 composite photoelectrode is enhanced by ∼61% in comparison with a pristine TiO2 photoelectrode.
authors.affiliation: Department of Chemical Engineering, National Chung Hsing University, 250, Kuo Kuang Road, Taichung 402, Taiwan.
authors.forename: Yin-Rou
authors.initials: YR
authors.lastname: Huang
authors.affiliation: Department of Chemical Engineering, National Chung Hsing University, 250, Kuo Kuang Road, Taichung 402, Taiwan.
authors.forename: Tzu-Wei
authors.initials: TW
authors.lastname: Huang
authors.affiliation: Department of Chemical Engineering, National Chung Hsing University, 250, Kuo Kuang Road, Taichung 402, Taiwan.
authors.forename: Tzu-Hui
authors.initials: TH
authors.lastname: Wang
authors.affiliation: Department of Chemical Engineering, National Chung Hsing University, 250, Kuo Kuang Road, Taichung 402, Taiwan. Electronic address: yctsai@dragon.nchu.edu.tw.
authors.forename: Yu-Chen
authors.initials: YC
authors.lastname: Tsai
keywords: Dye-sensitized solar cells; Gallium nitride; Titanium dioxide