Low-Cost Counter Electrodes from Strontium Titanate Doped Cobalt for Dye Sensitized Solar Cells
Wasan Maiaugree a, Nutchapon Nitipot a, Vittaya Amornkitbamrung a, Ekaphan Swatsitang a
a Khon Kaen University, Department of Physics, Faculty of Science, KhonKaen University, Khon Kaen , 40002, Thailand
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Poster 112
Publication date: 7th November 2016

In this research, strontium titanate (SrTiO3) doped cobalt (Co) were used as counter electrodes in dye-sensitized solar cells. SrTi1-XCoXO3 nanoparticles were prepared by hydrothermal method at 220 oC for 24 h. The surface morphology of SrTi1-XCoXO3 nanoparticles were observed by the scanning electron microscopy, and the particle sizes are about 50 - 150 nm. The SrTi1-XCoXO3 nanoparticles were mixed with PEDOT-PSS polymer blinder, and the films were coated on fluoride-doped tin oxide substrate (FTO glass) by tape casting technique. Cyclic voltammetry (CV) measurements indicated that SrTi1-XCoXO3 can be functioned as a catalysts in iodide/triiodide redox reaction. Electrochemical impedance spectroscopy (EIS) result shows charge transfer resistance of counter electrodes reduce after dope strontium titanate with cobalt.  The solar energy conversion efficiency increase with increasing Co dope, the highest efficiency of 8.31% was obtained in cell using SrTi1-XCoXO3 with x=0.075. The solar cell performance of strontium titanate doped cobalt with x=0.075 is slightly higher than the Pt DSSC (~8.27%).

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