TiO_2纳米线薄膜的MgO包覆及其在染料敏化太阳能电池中的性能  

Fabrication of MgO-Coated TiO_2 Nanowires Films and Application in Dye-Sensitized Solar Cells

作　　者：焦星剑[1] 林红[1] 庄东填[1] 李鑫[1] 李建保[1] 

机构地区：[1]清华大学新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《稀有金属材料与工程》2011年第S1期318-321,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50672041)

摘　　要：用水热法制备TiO2纳米线阵列,通过溶液沉积法在TiO2表面沉积MgO薄膜,并组装染料敏化太阳能电池,测试电池的光电性能。通过MgO包覆,电池的短路电流提高了35%,电池效率由1.11%提高到1.37%。电化学阻抗谱分析表明,MgO包覆提高了光阳极与电解质界面的复合电阻Rct,降低了光阳极与电解质界面电容Cμ从而有效抑制了界面复合反应,提高了电池性能。Nanowire arrays were prepared by a hydrothermal method. MgO coated TiO2 composite films were prepared by liquid deposition method. DSCs (dye-sensitized solar cells) based on bare TiO2 nanowire arrays and MgO/TiO2 nanowire arrays were fabricated. MgO layer can increase the photovoltage and photocurrent. The overall conversion efficiency of DSCs is increased from 1.11% to 1.37%. Electrochemical impedance spectroscopy (EIS) measurement was applied to investigate the electron transport and recombination properties of DSCs. Compared with TiO2 nanowire arrays, the MgO/TiO2 nanowire arrays possess bigger charge recombination resistance (Rct) and smaller chemical capacitance (Cμ) in the photoanodes, suggesting that the charge recombination is inhibited at the interfaces of TiO2 nanowire arrays electrode and electrolyte by MgO insulating layers.

关 键 词：TIO2 纳米线 MGO 染料敏化太阳能电池 电化学阻抗谱 

分 类 号：TM914.4[电气工程—电力电子与电力传动]