| 表面修饰的TiO2太阳能电池界面特性研究 | |
| Electrode Interface Characteristics of TiO2 Solar Cells with Surface Modification | |
| 摘要: 用水热法制备了具有典型锐钛矿晶型的TiO2纳米材料，采用Cr(NO3)3对TiO2薄膜电极进行修饰改性。用X射线衍射(XRD)、扫描电子显微镜(SEM)和光电子能谱(XPS)测试电极的物相及表面结构，结果显示TiO2薄膜表面包覆一层粒径较大的氧化铬颗粒，整个电极仍保持均匀的多孔结构。电流-电压(I-V)曲线测试结果显示，改性后最佳电极的短路电流和光电转换效率分别比改性前提高了31.1%和40.4%。用电化学阻抗谱(EIS)测试电池的界面特性，从测试结果可以看出，相同偏压下，改性后电池的TiO2/染料/电解质界面电阻更大，说明氧化铬包覆层在一定程度上抑制了界面的电子复合，改善了电池的光电输出特性。 | |
| 关键词: TiO2薄膜 染料敏化太阳能电池 电化学阻抗谱 表面修饰 | |
| 基金项目: 学科创新能力提升基金(No.2013XK04)资助项目。 | |
| Abstract: TiO2 nanomaterial with typital anatase was prepared by hydrothermal method. Asurface modification method was carried out by over layer coating on the surface of TiO2 thin film using Cr(NO3)3. The surface phase and morphology of electrodes were characterized by X ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results showed that a layer of chromium oxide with larger particles was coated on TiO2 thin film and the electrode remains homogeneous porous structure. The current-voltage (I-V) curves revealed that short circuit current and photoelectric transfer efficiency of the optimal modified electrode enhanced by 31.1% and 40.4% respectively more than before. Interface characteristics of cells were discussed using EIS. Seen from the results, the resistance of TiO2/dye/electrolyte interface of modified electrode was much larger than before at the same bias. It is indicated that chromium oxide coating on TiO2 thin film suppressed the charge recombination reactions and improved the performance of DSSCs. | |
| Keywords: TiO2 thin film dye-sensitized solar cells electrochemical impedance spectroscopy surface modification | |
| 投稿时间：2013-07-08 修订日期：2013-09-25 | |
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| 李艳,庄全超,王洪涛,吴文伟,赵宇龙,强颖怀.表面修饰的TiO2太阳能电池界面特性研究[J].无机化学学报,2014,30(4):763-769. | |
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