Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Our research aimed to improve the overall energy conversion efficiency of DSCs by applying nitrogen-doped TiO2 nano-tubes (TNTs) for the preparation of DSCs photo-anodes. The TNTs were synthesized by alkaline hydrothermal treatment of Degussa P25 TiO2 particles in 10M NaOH. The nano-tubes were N-doped by reflux in various concentrations of NH4NO3. The effects of nitrogen doping on the structure, morphology, and crystallography of TNTs were analyzed by transmission electron microscopy (TEM), infrared spectroscopy (IR), Raman spectroscopy, and X-ray photoelectron spectra (XPS). The blocking effect towards electron transfer between the doped/ non-doped electrodes and 1,4-dicyanonaphtalein was investigated by cyclic voltammetry. DSCs fabricated with doped and none-doped TNTs were characterized by J-V measurement and electrochemical impedance spectroscopy (EIS). Results showed that nitrogen doping significantly enhanced the efficiencies of TNT cells, reaching the optimum value (η = 7.1 %) with 2M nitrogen dopant, compared to η = 4.6% of none-doped TNT cells.The high efficiency of the nitrogen-doped TNT cells was attributed to increased current density due to the reduction of dark current in the DSCs.
Keywords: Dye-sensitized solar cell, TiO2 surface modification, N-doped TiO2, dark current.
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