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Preparation and phase transition characterization of VO2 thin film on single crystal Si (100) substrate by sol–gel process

  • Qiwu Shi
  • Wanxia Huang
  • Jiazhen Yan
  • Yubo Zhang
  • Mao Mao
  • Yang Zhang
  • Yuanjie Xu
  • Yaxin Zhang
Article

Abstract

Vanadium dioxide (VO2) thin films were fabricated on single crystal Si (100) substrates by sol–gel method, including a process of annealing a vanadium pentoxide (V2O5) gel precursor at different temperatures. The crystalline structure and morphology of the films were investigated by XRD, FE-SEM and AFM, indicating that the films underwent the grain growth, agglomeration and grain refinement process with increased annealing temperatures. The film annealed at 500 °C exhibits the formation of VO2 phase with a strong (011) preferred orientation and high crystallinity, the surface of the film is uniform and compact with a grain size of about 120 nm. Meanwhile, the film exhibits excellent phase transition properties, with a decrease of transmittance from 35.5 to 2.5% at λ = 25 μm and more than 3 orders of resistivity magnitude variation bellow and above the phase transition temperature. The phase transition temperature is evaluated at 60.4 °C in the heating transition and 55.8 °C in the cooling transition. Furthermore, the phase transition property of the VO2 film appears to be able to remain stable over repetitive cycles 100 times.

Keywords

VO2 thin film Sol–gel Single crystal Si substrate Phase transition 

Notes

Acknowledgments

This work was financially supported by the National Science Foundation of China (Grant Nos. 61072036) and the Science and Technology Supporting Programs Fund Project of Sichuan province (2009SZ0199). We would also thank Analytical and Testing center of Sichuan University for their XRD analysis.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Qiwu Shi
    • 1
  • Wanxia Huang
    • 1
  • Jiazhen Yan
    • 1
  • Yubo Zhang
    • 1
  • Mao Mao
    • 1
  • Yang Zhang
    • 1
  • Yuanjie Xu
    • 1
  • Yaxin Zhang
    • 2
  1. 1.College of Materials Science and EngineeringSichuan UniversityChengduPeople’s Republic of China
  2. 2.School of Physical ElectronicsUniversity of Electronic Science and Technology of ChinaChengduPeople’s Republic of China

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