Abstract
The band-edge levels of CdS-, CdSe-, and CdS/CdSe-sensitized TiO 2 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.
Original language | English |
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Article number | 012101 |
Journal | Applied Physics Letters |
Volume | 98 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2011 Jan 3 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)