TY - JOUR
T1 - Electrically controlled metalinsulator transition process in VO 2 thin films
AU - Zhao, Yong
AU - Hao, Ji
AU - Chen, Changhong
AU - Fan, Zhaoyang
PY - 2012/1/25
Y1 - 2012/1/25
N2 - We report the evolution process of VO 2 thin films from the insulating phase to the metallic phase under current injection for the two-electrode-based thin-film devices. Based on electrical characterization and Raman microscopic detection, it was found that there exist two critical current densities, based on which the insulator-to-metal transition process can be divided into three stages. In stage I with low current injection, the VO 2 film in the insulating (semiconducting) phase acts as a resistor until the first critical current density, above which the insulatormetal transition is a percolation process with metallic rutile and insulating monoclinic phases coexisting (stage II); while beyond a second critical current density, a filamentary current path with pure metallic phase is formed with the remaining part outside of the current path receding back to the pure insulating phase (stage III). We confirm that a critical current density is required for the onset of electrically induced insulator-to-metal transition in VO 2 thin films.
AB - We report the evolution process of VO 2 thin films from the insulating phase to the metallic phase under current injection for the two-electrode-based thin-film devices. Based on electrical characterization and Raman microscopic detection, it was found that there exist two critical current densities, based on which the insulator-to-metal transition process can be divided into three stages. In stage I with low current injection, the VO 2 film in the insulating (semiconducting) phase acts as a resistor until the first critical current density, above which the insulatormetal transition is a percolation process with metallic rutile and insulating monoclinic phases coexisting (stage II); while beyond a second critical current density, a filamentary current path with pure metallic phase is formed with the remaining part outside of the current path receding back to the pure insulating phase (stage III). We confirm that a critical current density is required for the onset of electrically induced insulator-to-metal transition in VO 2 thin films.
UR - http://www.scopus.com/inward/record.url?scp=84255171548&partnerID=8YFLogxK
U2 - 10.1088/0953-8984/24/3/035601
DO - 10.1088/0953-8984/24/3/035601
M3 - Article
C2 - 22179437
AN - SCOPUS:84255171548
SN - 0953-8984
VL - 24
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
IS - 3
M1 - 035601
ER -