Title :
Improvement of efficiency of dye-sensitized solar cells by reduction of internal resistance
Author :
Koide, Naoki ; Chiba, Yasuo ; Islam, Ashraful ; Komiya, Ryoichi ; Fuke, Nobuhiro ; Fukui, Atsushi ; Yamanaka, Ryohsuke ; Liyuan Man
Author_Institution :
Ecological Technol. Dev. Center, Sharp Corp., Nara, Japan
Abstract :
In order to elevate conversion efficiency, the series-internal resistance of dye-sensitized solar cells (DSCs) was investigated with electrochemical impedance spectroscopy measurement based on an equivalent circuit of DSCs. It was found that series-internal resistance correlates negatively with the roughness factor of the platinum counter electrode and positively with the thickness of the electrolyte layer. A cell sensitized with a black dye with series-internal resistance of 1.8 Ωcm2 was fabricated and showed conversion efficiency of 10.2%, which was confirmed at the National Institute of Advanced Industrial Science and Technology (AIST, Japan).
Keywords :
electrical resistivity; electrochemical impedance spectroscopy; electrodes; electrolytes; platinum; solar cells; surface roughness; National Institute of Advanced Industrial Science and Technology; Pt; conversion efficiency; dye-sensitized solar cells; efficiency improvement; electrochemical impedance spectroscopy measurement; electrolyte layer thickness; equivalent circuit; internal resistance reduction; platinum counter electrode; roughness factor; series-internal resistance; Counting circuits; Electrical resistance measurement; Electrochemical impedance spectroscopy; Electrodes; Energy conversion; Equivalent circuits; Impedance measurement; Photovoltaic cells; Platinum; Silicon;
Conference_Titel :
Photovoltaic Specialists Conference, 2005. Conference Record of the Thirty-first IEEE
Print_ISBN :
0-7803-8707-4
DOI :
10.1109/PVSC.2005.1488099
