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Electron injection assisted phase transition in a nano-Au-VO2 junction

2008; American Institute of Physics; Volume: 93; Issue: 6 Linguagem: Inglês

10.1063/1.2972106

1520-8842

Gang Xu, Chunming Huang, Masato Tazawa, Ping Jin, D. M. Chen, Lei Miao,

ZnO doping and properties

The semiconductor-metal transition of vanadium dioxide (VO2) thin films epitaxially grown on C-plane sapphire is studied by depositing Au nanoparticles onto the thermochromic films forming a metal-semiconductor contact, namely, a nano-Au-VO2 junction. It reveals that Au nanoparticles have a marked effect on the reduction in the phase transition temperature of VO2. A process of electron injection in which electrons flow from Au to VO2 due to the lower work function of the metal is believed to be the mechanism. The result may support the Mott–Hubbard phase transition model for VO2.