Energy level alignment, electron injection, and charge recombination characteristics in CdS/CdSe cosensitized TiO2 photoelectrode

Ching Fa Chi, Hsun Wei Cho, Hsisheng Teng, Cho Ying Chuang, Yu Ming Chang, Yao Jane Hsu, Yuh Lang Lee

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89 Citations (Scopus)

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 languageEnglish
Article number012101
JournalApplied Physics Letters
Volume98
Issue number1
DOIs
Publication statusPublished - 2011 Jan 3

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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