ZnO纳米四脚状阵列电极染料敏化太阳能电池

采用化学气相沉积(CVD)法制备了不同尺寸的四脚状纳米ZnO和ZnO纳米棒。采用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)对纳米ZnO的晶型结构和形貌进行表征,研究结果表明CVD法制备的四脚状纳米ZnO具有三维空间结构,其最小平均臂宽约为70nm,臂长约300nm,制备的纳米棒直径约为84nm,长约2μm,且都为六方纤锌矿晶型结构。将ZnO纳米四脚状及纳米棒利用滚涂法在FTO导电玻璃上形成ZnO光阳极,经N719染料敏化后组装成染料敏化太阳能电池,光电性能结果表明,染料敏化小尺寸的四脚状纳米ZnO太阳能电池光电转换效率(η=1.88%)高于染料敏化大尺寸的四脚状纳米ZnO太阳能电池光电转换效率(η=1.18%),远高于染料敏化ZnO纳米棒太阳能电池的光电转换效率(η=0.7%)。

ZnO nanotetrapod arrays based electrode dye sensitized solar cells

In this work,we adopt the simple vapor transmission deposition(VTD) to prepare ZnO nanotetrapods and nanorod in case of no catalyst.The nano ZnO were characterized by powder X-ray diffraction(XRD),scanning electron microscope(SEM).X-ray diffraction(XRD) suggests a hexagonal ZnO phase.SEM shows that ZnO tetrapods have a core at the center with four arms of about 70nm and arm lengths up to 300nm,growing out from the core along four directions.The arm diameter of ZnO nanorods is about 84nm.We introduce a photoanode architecture used scraper method in dye sensitized solar cell comprising thick film of nano ZnO.More important,we measured the photoelectric performance of these photoanodes,a power conversion efficiency of ZnO tetrapods dye sensitized solar cells up to 1.88%(under 100mW/cm2) is far higher than ZnO nanorods dye sensitized solar cells up to 0.7%.