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《Electronic Components and Materials》 2018-05
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Improved photovoltaic performance of dye-sensitized solar cell based on TiO_2/Al_2O_3 core-shell nanoarrays photoanode

YU Lei;TAN Yi;TAO Li;ZHANG Jun;SHEN Liangping;Key Laboratory of Ferroelectric Piezoelectric Materials and Devices, School of Physics and Electronic Science, Hubei University;  
The alumina sol was firstly prepared by hydrolyzation of aluminum isopropoxide.Ti O_2 nanotube arrays were immersed into alumina sol and followed with annealing treatment to coat a thin layer of high dielectric constant and wide band gap Al_2O_3 blocking layer.The Ti O_2/Al_2O_3 core-shell nanoarrays photoanode was accordingly constructed and applied in dye-sensitized solar cell(DSSC).The influence of sol treatment time and sol concentration on microstructure of photoanodes and photovoltaic performance of assembled solar cells were investigated.It is found that the cell based on the Ti O_2 nanotube arrays treated by immersing into 0.02 mol/L alumina sol for 15 min gives a highest power conversion efficiency of 7.85%,a59%enhancement on power conversion efficiency in comparison with the cell based on Ti O_2 nanotube arrays without sol treatment.The introducing of thin Al_2O_3 blocking layer onto Ti O_2 nanotubes arrays photoanode significantly improves the open circuit voltage of the solar cells and effectively suppresses the recombination between carries and the I_3~–ions in electrolytes or acceptor dye species in DSSC.The Al_2O_3 blocking layer with proper thickness also ensures the photo-excited carriers can effectively tunnel to the Ti O_2 photoanode.Accordingly the photovoltaic performance of solar cell based on Ti O_2/Al_2O_3 core-shell nanoarrays photoanode is significantly improved.
【Fund】: 国家自然科学基金项目(51602095)
【CateGory Index】: TM914.4
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