Vanadium is a 3d transition metal with the electron configuration [Ar] 3d3 4s2. This configuration lends itself to a range of four accessible oxidation states from V(II) up to V(V), leading to the four main oxide phases: VO, V2O3, VO2 and V2O5. However, mixed valence phases are easily formed leading to a menagerie of closely related crystal phases (eg. Magneli phases: VnO(2n-1) 3 n 9). The majority of vanadium oxide phases also exhibit a metal-insulator transition, whereby the resistivity of a material decreases several orders of magnitude upon thermal, optical or electric field excitation.
In our work we examine:
- The application of vanadium oxides in electronics, with specific emphasis on the metal-insulator transition and its characteristics
- The physical mechanism of the metal-insulator transition
- The composition, structure and evolution of vanadium oxide crystals under annealing and processing conditions
- The application of vanadium oxides in regards to water splitting
As a result, we specialise in the fabrication and characterization of vanadium oxide thin films and devices; and the study of vanadium oxide single crystals.
Murtagh, O., B. Walls, and I. V. Shvets. "Controlling the resistive switching hysteresis in VO2 thin films via application of pulsed voltage." Applied Physics Letters 117.6 (2020): 063501