Capacitance-voltage characteristics of SrTiO3/LaVO3 epitaxial heterostructures

Woong Choi; Sang Yoon Lee; Sands, Timothy D.
May 2010
Applied Physics Letters;5/24/2010, Vol. 96 Issue 21, p212903
Academic Journal
We report a quantitative analysis on the capacitance-voltage (C-V) characteristics of metal-insulator-semiconductor capacitors based on SrTiO3/LaVO3 epitaxial heterostructures grown by pulsed laser deposition. The C-V measurement of the heterostructure exhibited a decrease in capacitance by ∼20% at positive voltages with an estimated carrier concentration of 8×1018 cm-3. The C-V curve by a simulation was in good agreement with the measurement, confirming the formation of a depletion layer and the estimated carrier concentration. These results suggest that quantitative understanding on the electrical behavior of oxide heterostructures is possible with C-V measurements, with potentially important implications on their device applications.


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