氧气
化学计量学
溶解
化学物理
材料科学
离子
金属
过渡金属
金属-绝缘体过渡
无机化学
化学
纳米技术
物理化学
催化作用
生物化学
有机化学
冶金
作者
Kun Han,Hanyu Wang,Liang Wu,Yu Cao,Dongchen Qi,Changjian Li,Zhen Huang,Xiao Li,Xiao Renshaw Wang
摘要
Metal-insulator transition (MIT), an intriguing correlated phenomenon induced by the subtle competition of the electrons' repulsive Coulomb interaction and kinetic energy, is of great potential use for electronic applications due to the dramatic change in resistivity. Here, we demonstrate a reversible control of MIT in VO2 films via oxygen stoichiometry engineering. By facilely depositing and dissolving a water-soluble yet oxygen-active Sr3Al2O6 capping layer atop VO2 at room temperature, oxygen ions can reversibly migrate between VO2 and Sr3Al2O6, resulting in a gradual suppression and a complete recovery of MIT in VO2. The migration of the oxygen ions is evidenced in a combination of transport measurement, structural characterization, and first-principles calculations. This approach of chemically induced oxygen migration using a water-dissolvable adjacent layer could be useful for advanced electronic and iontronic devices and studying oxygen stoichiometry effects on the MIT.
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