Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 12, Issue 8, Pages 1124-1128Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2010.05.046
Keywords
TiO2-SrTiO3 nanotube arrays; Quantum dot sensitized solar cells; Electron injection; Charge recombination; Solar energy conversion
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Funding
- Office of Basic Energy Sciences of the Department of Energy
- China Scholarship Council
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TiO2-SrTiO3 heterostructure nanotube arrays have been utilized as a novel oxide substrate for CdS quantum dot sensitized solar cells (QDSCs). SrTiO3 on TiO2 surface passivates surface states of TiO2 and builds cascade-structured band alignment, which significantly reduces charge recombination at electrode surface. CdS/TiO2-SrTiO3 electrode exhibits a superior photoelectrochemical performance than CdS/TiO2 electrode with similar to 70% increase in external quantum efficiency. This study suggests that the suppression of charge recombination at electrode surface is critical to efficient solar energy conversion. (C) 2010 Elsevier B.V. All rights reserved.
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