钇掺杂多孔结构氧化锌纳米棒的制备与性能研究

采用两步法在二氧化锡掺氟(SnO2:F,FTO)导电玻璃基板上制备出钇(Y)掺杂多孔结构氧化锌(ZnO)纳米棒,首先利用浸渍-提拉法在FTO导电玻璃基板上制备ZnO晶种层,然后利用水热法在ZnO晶种层上生长Y掺杂ZnO纳米棒.研究了不同浓度Y掺杂ZnO纳米棒的晶相结构、微观形貌、化学组成及光学性能.实验结果表明:所制备的Y掺杂ZnO纳米棒为沿c轴择优取向生长的六方纤锌矿结构,随着Y掺杂浓度的增加,ZnO纳米棒(002)衍射峰强度先增大后减小,纳米棒的平均长度由1.3μm增加到2.6μm.ZnO纳米棒的形貌由锥状结构向柱状结构演化,纳米棒侧面的孔洞分布密度增加.所制备的Y掺杂ZnO纳米棒具有一个较弱的紫外发光峰和一个较强的宽可见发光峰.所制备样品的光学带隙随着Y掺杂浓度的增加而减小,其光学带隙在3.29～3.21 eV之间变化.利用Y掺杂ZnO纳米棒作为量子点敏化太阳能电池的光阳极可极大提高太阳电池的光电转换效率.

Preparation and Properties of Yttrium-Doped Porous Zinc Oxide Nanorods

Yttrium-doped porous zinc oxide(ZnO)nanorod array was prepared on fluorine-doped tin dioxide(SnO2:F,FTO)conductive glass substrates by two-step method.The ZnO seed layer was firstly prepared on FTO glass by dip-coating method and highly oriented ZnO nanorods were then grown on the seed layer through hydrothermal method.The crystal phase structure,microstructure,composition and optical properties of Y-doped ZnO nanorods with different concentrations were investigated.The experimental results show that the prepared Y-doped ZnO nanorods are hexagonal wurtzite structures with preferential orientation along the c-axis.With the increase of Y doping concentration,the diffraction peak intensity of ZnO nanorods(002)increases first and then decreases.The average length of the nanorods increased from 1.3μm to 2.6μm.The morphology of ZnO nanorods evolved from a pyramidal structure to a columnar structure,and the density of pores on the side of the nanorods increased.The prepared Y-doped ZnO nanorods have a weak ultraviolet luminescence peak and a strong broad visible luminescence peak.The optical band gap of the prepared sample decreased as the Y doping concentration increased,and the optical band gap varied from 3.29 eV to 3.21 eV.The use of Y-doped ZnO nanorods as the photoanode of quantum dot-sensitized solar cells can greatly improve the photoelectric conversion efficiency of solar cells.