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Conference Object Effect of Porosity on the Efficiency of Dssc Produced by Using Nano-Size Tio2 Powders(2014) Bilgin,N.; Park,J.; Ozturk,A.The effect of porosity on the energy conversion efficiency of dye-sensitized solar cells (DSSCs) prepared by using pastes formed by mixing 20 nm and 200 nm TiO2 particles in different ratios is investigated. XRD and SEM analysis have been done to investigate the microstructure of pastes. The energy conversion efficiency of DSSCs was determined by drawing complete current density-voltage curve. The DSSC prepared using the mixture composed of 40 wt% 20 nm and 60 wt% 200 nm TiO2 particles maintained best energy conversion efficiency of 6.74%. The energy conversion efficiency of the DSSCs prepared by using pastes based on the mixture of two different size of TiO 2 particles is much better than that of the DSSCs prepared by using pastes composed of either only 20 nm or only 200 nm of TiO2 particles. The improved energy conversion efficiency is attributed to the establishment of further porous structure that lets more dye absorption from the surface through interior which provides enhancement of light absorption and multiple scattering.Conference Object Citation - Scopus: 1Production of Highly Efficient Photocatalytic Tio2 Powders by Mechanical Ball Milling(2013) Oztas,T.; Park,J.; Ozturk,A.Highly efficient photocatalytic TiO2 powders were prepared using a conventional ball mill with various milling times of 0, 12, 24 and 48 h. The photocatalytic activity of the prepared TiO2 powders was evaluated using the decomposition rate obtained by methylene blue (MB) solution and acetic acid gas under UV light irritation. After 24 h milling, the particle size decreased from 555 nm to 122 nm without changing any of the crystal structure. The photocatalytic TiO2 powders prepared by 24 h milling decomposed 94% of the methylene blue solution while the nonmilled TiO2 powders provided only 61% decomposition. After the removal of acetic acid gas, it took 1.5 h for the 24h-milled powders to decompose 100%, while the non-milled TiO2 showed 73% decomposition with same UV illumination duration. © (2013) Trans Tech Publications, Switzerland.
