利用NaYF_4:Er^(3+)/Yb^(3+)和g-C_3N_4的协同效应提高染料敏化太阳电池的光电转化效率（英文）

Enhanced photoelectric conversion efficiency of dye-sensitized solar cells by the synergetic effect of NaYF_4:Er^(3+)/Yb^(3+) and g-C_3N_4

本文首次成功设计并得到以TiO_2-NaYF_4:Er^(3+)/Yb^(3+)-C_3N_4复合材料作为光阳极的染料敏化太阳电池.与纯TiO_2和TiO_2-C_3N_4电池相比,TiO_2-NaYF_4:Er^(3+)/Yb^(3+)-C_3N_4复合电池的效率明显提高.研究表明,TiO_2-NaYF_4:Er^(3+)/Yb^(3+)-C_3N_4复合电池的TiO_2-dye|I_3^-/I^-界面阻抗小于纯TiO_2电池.此外TiO_2-NaYF_4:Er^(3+)/Yb^(3+)-C_3N_4电池具有更长的复合时间和更短的传输时间.电池效率的提高归结于NaYF_4:Er^(3+)/Yb^(3+)和g-C_3N_4的协同效应.

TiO2-NaYF4：Er^3＋/Yb^3＋-C3N4 composite photoanodes were successfully designed for the first time. The photoelectric conversion efficiency of TiO2-NaYF4：Er^3＋/Yb^3＋ C3N4 composite cell can result an efficiency of 7.37%, which is higher than those of pure TiO2 cell and TiO2-C3N4 composite cell. The enhancement of the efficiency can be attributed to the synergetic effect of NaYF4：Er^3＋/Yb^3＋ and C3N4. Elec- trochemical impedance spectroscopy analysis revealed that the interfacial resistance of the TiO2-dyelI3^-/I^- electrolyte interface of TiO2-NaYF4：Er^3＋/Yb^3＋-C3N4 composites cell was much smaller than that of pure TiO2 cell. In addition, the TiO2-NaYF4：Er^3＋/Yb^3＋-C3N4 composite cell had longer electron recombination time and shorter electron transport time than that of pure TiO2 cell.