Fabrication and performance of nanoporous TiO2/SnO2 electrodes with a half hollow sphere structure for dye sensitized solar cells |
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Authors: | Bak Yu-Rim Kim Gyeong-Ok Hwang Moon-Jin Cho Kwon-Koo Kim Ki-Won Ryu Kwang-Sun |
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Institution: | (1) Department of Chemistry, University of Ulsan, Ulsan, 680-749, Korea;(2) i-Cube Center, ITRC for Energy Storage and Conversion, Gyeongsang National University, Jinju, Gyeongnam, 660-701, Korea; |
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Abstract: | The incorporation of nano-crystalline semiconductors with novel kinds of ordered microstructure is a very important area of
research in the field of dye sensitized solar cells. A sol–gel method involving hydrolysis of titanium isopropoxide was used
to form TiO2 nanoparticles on the surface of SiO2 spheres. In this process, 1, 5, or 10 wt% of SnCl2.2H2O was added to the sol–gel solution. To prepare TiO2/SnO2 nanoparticles with a half hollow sphere structure, SiO2 was removed with NaOH solution. The crystal phase, crystal shape, and surface properties of the metal oxide nanocrystals
were studied by x-ray diffraction and scanning electron microscopy. The photovoltaic performance of the TiO2/SnO2 nanoparticles with half hollow sphere structures was measured. The dye sensitized solar cell using nanoporous TiO2 as electrode materials exhibits an overall conversion efficiency of 7.36% with a light intensity of 100 mW/cm2. The short circuit photocurrent (Isc), open circuit photovoltage (Voc), and conversion efficiency (η) of these solar cells were improved over conventional materials. |
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