二氧化钛包覆氧化锌纳米阵列光阳极的制备与性能

发布时间：2018-05-30 02:00

  本文选题：核壳结构 + 染料敏化太阳能电池　； 参考：《硅酸盐学报》2014年07期

【摘要】：采用直流反应磁控溅射工艺,在ZnO纳米阵列的表面实现TiO2包覆,作为染料敏化太阳能电池光阳极,研究TiO2--ZnO核壳结构的形成机理和制备工艺对其光电性能的影响。利用X射线衍射仪、扫描电子显微镜、能谱分析仪表征光阳极材料的成分与结构。测试电池组件的伏安特性曲线、电压-时间曲线和电化学阻抗谱,分析TiO2包覆对电子传输性能和光电转换效率的影响机理。结果表明:磁控溅射制备的TiO2颗粒完整地包覆ZnO纳米阵列,使得纳米棒表面形貌由六棱柱向圆柱状转变,间隙变窄,直径较ZnO纳米阵列有所增加,阵列有序度得到改善。随着延长染料吸附时间和TiO2包覆,光阳极界面电子传输阻抗显著增加,光生电子的寿命也得到提高。经过包覆的光阳极能够作为阻挡层钝化表面缺陷,抑制复合的发生,从而提高开路电压和填充因子。经过包覆的光阳极其光电转换效率相对于纯ZnO纳米阵列提高了132%。
[Abstract]:Using the DC reactive magnetron sputtering technology, the TiO2 coating was realized on the surface of the ZnO nanoscale array. As the photoanode of the dye sensitized solar cell, the formation mechanism of the TiO2--ZnO nuclear shell structure and the effect of the preparation process on its photoelectric properties were studied. The components of the photoanode materials were analyzed by the X ray diffractometer and the scanning electron microscopy. And structure. Test the volt ampere characteristic curve, voltage time curve and electrochemical impedance spectrum of the battery assembly, analyze the influence mechanism of the TiO2 coating on the electronic transmission performance and the photoelectric conversion efficiency. The results show that the TiO2 particles prepared by magnetron sputtering are completely coated with ZnO nanoscale arrays, which make the surface morphology of the nanorods change from six prism to cylindrical shape. With the gap narrowing, the diameter of the array is increased and the array order is improved. With the prolongation of the adsorption time and the TiO2 coating, the electronic transmission impedance of the photoanode interface increases significantly, and the lifetime of the photoelectron is improved. The coated photoanode can be used as a passivation surface defect in the barrier layer, thus inhibiting the formation of the composite. By increasing the open circuit voltage and fill factor, the photoelectric conversion efficiency of the coated photoanode is increased by 132%. compared to that of the pure ZnO nano array.
【作者单位】： 兰州理工大学材料学院 省部共建有色金属先进加工与再利用国家重点实验室;
【分类号】：TM914.4

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