期刊
NANOTECHNOLOGY
卷 20, 期 28, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/20/28/285311
关键词
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资金
- Knowledge Innovation Program of the Chinese Academy of Sciences
- National Basic Research Program [2007CB936700]
- Fund of the National Engineering Research Center for Optoelectronic Crystalline Materials [2005DC105003: 2007K01]
- Key Program of Science and Technology in Fujian Province [2008H0040]
We report a radio frequency magnetron sputtering method for producing TiO2 shell coatings directly on the surface of ZnO nanorod arrays. ZnO nanorod arrays were firstly fabricated on transparent conducting oxide substrates by a hydrothermal route, and subsequently decorated with TiO2 by a plasma sputtering deposition process. The core/shell nanorods have single-crystal ZnO cores and anatase TiO2 shells. The shells are homogeneously coated onto the whole ZnO nanorods without thickness change. This approach enables us to tailor the thickness of the TiO2 shell for desired photovoltaic applications on a one-nanometer scale. The function of the TiO2 shell as a blocking layer for increasing charge separation and suppression of the surface recombination was tested in dye-sensitized solar cells. The enhanced photocurrent and open-circuit voltage gave rise to increased photovoltaic efficiency and decreased dark current, indicating successful functioning of the TiO2 shell.
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