Leakage mechanisms of self-assembled (BiFeO3)0.5:(Sm2O3)0.5 nanocomposite films

Yang, H.; Wang, H.; Zou, G. F.; Jain, M.; Suvorova, N. A.; Feldmann, D. M.; Dowden, P. C.; DePaula, R. F.; MacManus-Driscoll, J. L.; Taylor, A. J.; Jia, Q. X.
October 2008
Applied Physics Letters;10/6/2008, Vol. 93 Issue 14, p142904
Academic Journal
Nanocomposite (BiFeO3)0.5:(Sm2O3)0.5 films were deposited on (001) oriented Nb-doped SrTiO3 substrates by pulsed laser deposition. The leakage current density versus electric field characteristics were investigated and compared with those of as-deposited and annealed pure BiFeO3 (BFO) thin films. The dominant leakage mechanisms of nanocomposite films were space-charge-limited current and Poole–Frenkle emission for positive and negative biases, respectively. The leakage current density of nanocomposite films was reduced three orders of magnitude in comparison with the as-deposited pure BFO films. The less oxygen vacancies in the BFO phase in the nanocomposite is believed to contribute to the leakage reduction.


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