Title :
Effect of Different Graphene Oxide Contents on Dye-Sensitized Solar Cells
Author :
Jung-Chuan Chou ; Chin-Hui Huang ; Yi-Hung Liao ; Shen-Wei Chuang ; Li-Hong Tai ; Yu-Hsun Nien
Author_Institution :
Grad. Sch. of Electron. Eng., Nat. Yunlin Univ. of Sci. & Technol., Douliou, Taiwan
Abstract :
Graphene/TiO2 composite films were deposited on fluorine-doped SnO2-coated conductive substrates by spin coating acting as photoelectrodes of dye-sensitized solar cells. The graphene/TiO2 composite films were characterized by scanning electronic microscopy, an X-ray diffractometer, a UV-visible spectrometer, and electrochemical impedance spectroscopy. Nyquist plots showed the decrease of impedance, in which electron transport rate was promoted. The photovoltaic properties showed that the incorporation of graphene could increase the short-circuit current density and photoelectric conversion efficiency. However, an excessive incorporation of graphene led to the enhancement of charge recombination and the reduction of photoelectric conversion efficiency. The graphene/TiO2 composite film with 1.5-mL graphene oxide solution obtained the optimal photoelectric conversion efficiency of 5.26%.
Keywords :
X-ray diffraction; composite material interfaces; current density; dye-sensitised solar cells; electrochemical electrodes; electrochemical impedance spectroscopy; graphene; photoconductivity; photoelectrochemistry; scanning electron microscopy; semiconductor materials; short-circuit currents; spin coating; thin film devices; thin films; titanium compounds; ultraviolet spectra; visible spectra; CO-TiO2; Nyquist plots; SnO2:F; UV-visible spectrometer; X-ray diffractometer; charge recombination; dye-sensitized solar cells; electrochemical impedance spectroscopy; electron transport rate; fluorine-doped SnO2-coated conductive substrates; graphene oxide contents; graphene-TiO2 composite films; photoelectric conversion efficiency; photoelectrodes; photovoltaic properties; scanning electronic microscopy; short-circuit current density; spin coating; Decision support systems; Graphene; Impedance; Photovoltaic cells; Photovoltaic systems; Resistance; Dye-sensitized solar cell (DSSC); X-ray diffractometer; electrochemical impedance spectrometer; graphene; scanning electronic microscopy;
Journal_Title :
Photovoltaics, IEEE Journal of
DOI :
10.1109/JPHOTOV.2015.2419137
