Soft X-ray spectroscopic study on the electronic structure of WO3 thin films fabricated under various annealing temperature and gas flow conditions
| Autor: | Yeong Ji Im, Soohaeng Cho, Hirohito Ogasawara, Yoo Kyung Park, Chang Jin Lim, Sang Wan Cho, Hyunbok Lee |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
X-ray absorption spectroscopy Materials science Absorption spectroscopy Annealing (metallurgy) Band gap Analytical chemistry General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences X-ray photoelectron spectroscopy Electrical resistivity and conductivity 0103 physical sciences General Materials Science Emission spectrum Thin film 0210 nano-technology |
| Zdroj: | Current Applied Physics. 21:31-35 |
| ISSN: | 1567-1739 |
| Popis: | The electrical properties of WO3 thin films vary significantly depending on the growth conditions. In this work, the influence of O2 gas on the band gap of WO3 thin films during growth was investigated via electronic structure characterization using X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS), and X-ray emission spectroscopy (XES). A substantial decrease in the electrical conductivity of the WO3 films was observed with an increase in the O2 partial pressure during growth. Spectral differences in the peak energy and intensity were apparent for WO3 films grown under only Ar and those grown in Ar:O2. It is difficult to explain the acquired spectrum of WO3 with oxygen defects through the rigid-band model in terms of the simple addition of electrons to the conduction band of WO3. Our results show that an oxygen deficiency in WO3 moves the conduction band to the Fermi edge. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect