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Dr. Bashir Ahmmad
Yamagata University, Japan
Structural Changes in N719 Dye Moleculeand ImprovedPerformancesof Dye Sensitized Solar Cells
The structural changes of N719 dye on TiO2 electrode indye-sensitized solar cells (DSSCs) under visible light exposure and high temperature up to 80°Cwere investigated by using multiple-internal-reflection infrared (MIR-IR)spectroscopy. MIR-IR spectroscopy clearly indicated the changes in N719 structure such as degradation of NCS groups and hydrocarbon. Water generation on the TiO2 surface was also confirmed which is considered to be the secondary effect for the suppression of power generation performance.To achieve long-term stability and improved performance of DSSCs, we also investigated the effects of guanidine isothiocyanate addition to the electrolyte, heat treatment of the TiO2 electrode and amorphous oxides coating on the TiO2 electrode. The results indicate that the addition of guanidine isothiocyanate improves the stability of NCS ligand under bothlight exposure and high temperature. It is considered that the guanidine isothiocyanate enhances the reversed reaction of NCS desorption in the above environments.Vacuum heattreatment of TiO2 could improve the performance of DSSCs by suppressionof H2O generation. Atomic layer deposited amorphous oxides (such as SiO2) coating on TiO2 electrode also found to improve both the efficiency and stability of DSSCs. The improved performanceswere explained by thesuppression of water generation and alteration of resistances (series and parallel) in the cells.
Bashir Ahmmad has completed his PhD from Kagoshima University, Japan. Currently, he is an assistant professor at the Graduate School of Science and Engineering, Yamagata University, Japan. Prior to joining the current institution, B.Ahmmad was an assistance professor and researcher at Okayama University and Kyushu University, respectively. He is a recipient of Japanese Government Scholarship and also JSPS postdoctoral fellowship by the Japan Society for the Promotion of Science. His research interests include nanomaterials, photoelectrocheimcal water splitting for hydrogen production,solar cells and magnetic materials. He has published more than 50technical papers in reputed journals and 2 book chapters.He is serving as editorial board member of American Research Journal of Electrical Engineering, International Institute of Engineers and guest editor of the International Journal of Photoenergy.
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