Films minces intelligents à propriétés commandables pour des applications électriques et optiques avancées : dopage du dioxyde de vanadium

Abstract : This thesis presents a study of the effect of chromium doping on structural, electrical and optical properties of thin films of vanadium dioxide. These V(1-x)CrxO2 thin films (x from 0 to 25%) of 110 nm thick have been deposited on c sapphire substrate by multi target Pulsed Laser Deposition method. Their morphological, structural, electrical and optical properties have been studied. Different phases for V(1-x)CrxO2 have been identified by XRD and Raman analysis and compared to those of bulk material. M1, M2, M3, a mixture M2 + M3 and R phases are present. The M4 phase has not been detected for doping above 8%, showing a real difference between phase diagram of bulk and thin films. Chromium doping also increases the metal-insulator transition temperature from 68°C to 102°C. Moreover, the transition dynamics, determined using optical transmission and electrical resistivity measurements, decreases. Finally, two terminal switches based on V(1-x)CrxO2 thin films have been fabricated. Their current-voltage characterization showed that chromium doping affects the activation threshold voltage of the metal to insulator transition.
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Rafika Zaabi. Films minces intelligents à propriétés commandables pour des applications électriques et optiques avancées : dopage du dioxyde de vanadium. Matériaux. Université de Limoges, 2015. Français. ⟨NNT : 2015LIMO0119⟩. ⟨tel-01289500⟩

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