CdS Quantum Dots-Sensitized TiO2 Nanorod Array on Transparent Conductive Glass Photoelectrodes
CdS Quantum Dots-Sensitized TiO2 Nanorod Array on Transparent Conductive Glass Photoelectrodes
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DOI：
10.1021/jp104208z
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发表时间：
2010-10-07
影响因子：
3.7
通讯作者：
Guo, Lin
中科院分区：
文献类型：
--
作者：
Wang, Hua;Bai, Yusong;Guo, Lin
在透明导电基底上的定向单晶TiO 2纳米棒或线阵列将是制备光电化学太阳能电池中最理想的纳米结构，因为其有效的电荷分离和传输特性以及上级的光捕获效率。采用水热法在透明导电玻璃（Fro）上直接生长了TiO 2纳米棒阵列薄膜。采用化学浴沉积法在垂直排列的TiO 2纳米棒光电极上制备了CdS量子点。采用扫描电子显微镜、透射电子显微镜、高分辨透射电子显微镜和X射线衍射对材料进行了表征。结果表明，CdS量子点均匀地覆盖在单晶TiO 2纳米棒的表面，粒径小于10 nm。在AM1.5G光照下，该光电极的光电流强度为5.778mA/cm（2），开路光电压为1.292V。光电流是裸TiO 2纳米棒阵列的28.6倍，光电化学性能与CdS量子点敏化的TiO 2纳米管阵列相当，表明CdS量子点敏化的TiO 2纳米棒阵列在MO光电极上具有潜在的应用前景.
An oriented single-crystalline TiO2 nanorod or wire array on transparent conductive substrates would be the most desirable nanostructure in preparing photoelectrochemical solar cells because of its efficient charge separation and transport properties as well as superior light harvesting efficiency. In this study, a TiO2 nanorod array film grown directly on transparent conductive glass (Fro) was prepared by a simple hydrothermal method. The formation of CdS quantum dots (QDs) on the vertically aligned TiO2 nanorods photoelectrode was carried out by chemical bath deposition. The as-prepared materials were characterized by scanning electron microscopy, transmission electron microscopy (TEM), high-resolution TEM, and X-ray diffraction. The results indicate that CdS QDs with a diameter smaller than 10 nm are uniformly covered on the surface of the single-crystalline TiO2 nanorods. Under AM 1.5 G illumination, the photoelectrode was found with a photocurrent intensity of 5.778 mA/cm(2) at a potential of 0 V versus Ag/AgCl and an open-circuit photovoltage of 1.292 V versus Ag/AgCl. The photocurrent is 28.6 times higher than that of a bare TiO2 nanorod array, and the photoelectrochemical properties are comparable to those of a CdS QDs-sensitized TiO2 nanotube array, suggesting that the CdS QDs-sensitized TiO2 nanorod array on MO photoelectrodes has a potential application in solar cells.