4.8 Article

Valence Band of Rutile TiO2(110) Investigated by Polarized-Light-Based Angle-Resolved Photoelectron Spectroscopy

Journal

JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 13, Issue 10, Pages 2299-2305

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.2c00142

Keywords

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Funding

  1. National Natural Science Foundation of China [21973092, 21688102]
  2. National Key Research and Development Program of China [2021YFA1500601, 2018YFA0208703]

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This study measured the valence band structure and hole effective mass of rutile TiO2(110) using angle-resolved photoelectron spectroscopy, and analyzed the dependence of photoemission intensities on excitation light polarization by considering the parity symmetry of molecular orbitals.
Band structure dictates optical and electronic properties of solids and eventually the efficiency of the semiconductor based solar conversion. Compared to numerous theoretical calculations, the experimentally measured band structure of rutile TiO2, a prototypical photocatalytic material, is rare. In this work, the valence band structure of rutile TiO2(110) is measured by angle-resolved photoelectron spectroscopy using polarized extreme ultraviolet light. The effective mass of the hole, which has never been measured before, is determined to be 4.66-6.87 m(0) (free electron mass) and anisotropic. The dependence of photoemission intensities on excitation light polarization is analyzed by taking into account of the parity symmetry of molecular orbitals in the blocking unit of rutile TiO2. This work reports a direct measurement of valence band structure and hole effective mass of rutile TiO2(110), which will deepen our understanding of the electronic structure and charge carrier properties of the model material and provide reference data for future theoretical calculations.

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