Photoelectrochemical Performance of Multiple Semiconductors (CdS/CdSe/ZnS) Cosensitized TiO2 Photoelectrodes

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• 作者：Shuli Cheng ; Wuyou Fu ; Haibin Yang ; Lina Zhang ; Jinwen Ma ; Hui Zhao ; Meiling Sun ; Lihua Yang
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：January 26, 2012
• 年：2012
• 卷：116
• 期：3
• 页码：2615-2621
• 全文大小：482K
• 年卷期：v.116,no.3(January 26, 2012)
• ISSN：1932-7455

文摘

The morphology of TiO₂ nanotubes with nanowires directly formed on top (designed as TiO₂ NTWs) would be a promising nanostructure in fabricating photoelectrochemical solar cells for its advantages in charge separation, electronic transport, and light harvesting. In this study, a TiO₂ NTWs array film was prepared by a simple anodization method. The formation of CdS, CdSe, and ZnS quantum dots (QDs) sensitized TiO₂ NTWs photoelectrode was carried out by successive ionic layer adsorption. The as-prepared materials were characterized by scanning electron microscopy, high-resolution transmission electron microscopy, and X-ray diffraction. Our results indicate that the nanocrystals have effectively covered both inner and outer surfaces of TiO₂ NTWs array. The interfacial structure of QDs/TiO₂ was also investigated for the first time in our experiment, and the growth interface when annealed to 300 掳C was verified. Under AM 1.5G illumination, we found the photoelectrodes have an optimum short-circuit photocurrent density of 4.30 mA/cm² and corresponding energy conversation efficiency of 2.408%, which is 28 times higher than that of a bare TiO₂ NTWs array. The excellent photoelectrochemical properties of our photoanodes suggest that the TiO₂ NTWs array films (2.6鈥?.8 渭m) cosensitized by CdS, CdSe, and ZnS nanoclusters have potential applications in solar cells.