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

Volume

5

Issue

4

fYear

2015

fDate

Jul-15

Firstpage

1106

Lastpage

1112

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;

fLanguage

English

Journal_Title

Photovoltaics, IEEE Journal of

Publisher

ieee

ISSN

2156-3381

Type

jour

DOI

10.1109/JPHOTOV.2015.2419137

Filename

7094224