Journal
APPLIED PHYSICS LETTERS
Volume 98, Issue 1, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3533642
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- National Science Council of Taiwan [NSC-99-ET-E006-003-ET, NSC-98-3114-E-007-005, NSC-96-2628-002-002-MY3]
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The band-edge levels of CdS-, CdSe-, and CdS/CdSe-sensitized TiO2 electrodes were determined by ultraviolet photoelectron spectroscopy (UPS) to explore the reason leading to the high performance of the TiO2/CdS/CdSe electrode. The obtained UPS results show the stepwise energy level in the TiO2/CdS/CdSe electrode, indicating energy level alignment occurrence between CdS and CdSe in the TiO2/CdS/CdSe. Time-resolved photoluminescence and open-circuit photovoltage decay experiments reveal that the photogenerated electrons in the TiO2/CdS/CdSe have higher injection efficiency, but lower recombination rate to the electrolyte, attributable to the stepwise structure of band-edge levels constructed by the effect of the energy level alignment. (C) 2011 American Institute of Physics. [doi:10.1063/1.3533642]
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