Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 3, Issue 9, Pages 3396-3401Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am2006299
Keywords
vanadium dioxide; thin film; metal-insulator transition; near-surface stoichiometry; Kelvin force microscopy; work function; X-ray photoelectron spectroscopy
Funding
- AFOSR [FA9550-08-1-0203]
- ONR [N00014-10-1-0131]
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Vanadium dioxide (VO2) undergoes a sharp metal-insulator transition (MIT) in the vicinity of room temperature and there is great interest in exploiting this effect in novel electronic and photonic devices. We have measured the work function of vanadium dioxide thin films across the phase transition using variable temperature Kelvin force microscopy (KFM). The work function is estimated to be similar to 5.15 eV in the insulating phase and increases by similar to 0.15 eV across the MIT. We further show that the work function change upon the phase transition is highly sensitive to near-surface stoichiometry studied by X-ray photoelectron spectroscopy. This change in work function is distinct from bulk resistance-versus temperature trends commonly used to evaluate synthesis protocols for such vanadium oxide films and optimize stoichiometry. The results are pertinent to understanding fundamental electronic properties of vanadium oxide as well as charge injection phenomena in solid-state devices incorporating complex oxides containing multivalence cations.
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