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.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
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)
