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Properties of Molybdenum Trioxide Thin Films

This paper presents a study of the electrical and electromechanical properties of MoO3 thin films deposited onto metal-coated substrates. Rectifing effects are observed in the metal-MoO3-metal structures. Remarkable voltage responses to mechanical stress applied to the MoO3 film are also observed. These phenomena may not be caused by piezoelectricity but may rather involve the electrochromic effect of MoO3 due to its long relaxation time of a few seconds.