MU Digital Repository
Logo

Effect of Li substitution on dielectric and ferroelectric properties of ZnO thin films grown by pulsed-laser ablation

Kekuda, Dhananjaya and Nagaraju, J and Krupanidhi, S B (2006) Effect of Li substitution on dielectric and ferroelectric properties of ZnO thin films grown by pulsed-laser ablation. Journal of Applied Physics.

[img] PDF
Effect of Li substitution on dielectric and ferroelectric properties of ZnO.pdf - Published Version
Restricted to Registered users only

Download (118kB) | Request a copy

Abstract

Li-doped ZnO thin films _Zn1−xLixO, x=0.05–0.15_ were grown by pulsed-laser ablation technique.Highly c-axis-oriented films were obtained at a growth temperature of 500 °C. Ferroelectricity in Zn1−xLixO was found from the temperature-dependent dielectric constant and from the polarization hysteresis loop. The transition temperature _Tc_ varied from 290 to 330 K as the Li concentration increased from 0.05 to 0.15. It was found that the maximum value of the dielectric constant at Tc is a function of Li concentration. A symmetric increase in memory window with the applied gate voltage is observed for the ferroelectric thin films on a p-type Si substrate. A ferroelectric P-E hysteresis loop was observed for all the compositions. The spontaneous polarization _Ps_ and coercive field _Ec_ of 0.6 _C/cm2 and 45 kV/cm were obtained for Zn0.85Li0.15O thin films. These observations reveal that partial replacement of host Zn by Li ions induces a ferroelectric phase in the wurtzite-ZnO semiconductor. The dc transport studies revealed an Ohmic behavior in the lower-voltage region and space-charge-limited conduction prevailed at higher voltages. The optical constants were evaluated from the transmission spectrum and it was found that Li substitution in ZnO enhances the dielectric constant.

Item Type: Article
Uncontrolled Keywords: Li doped ZnO, Ferroelectricity, Pulsed laser ablation
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 27 Aug 2013 09:32
Last Modified: 27 Aug 2013 09:32
URI: http://eprints.manipal.edu/id/eprint/136939

Actions (login required)

View Item View Item