Journal
APPLIED PHYSICS LETTERS
Volume 103, Issue 26, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4859675
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- National Science Council of the Republic of China, Taiwan [NSC-101-2221-E- 239-027, NSC-102-2221-E-239-030]
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The resistive switching (RS) effect of sputtered SrZrO3 memory cell is investigated by current-voltage (I-V) and impedance spectroscopy (IS) measurements for ON and OFF states. While the ON-state conduction in I-V exhibits ohmic relation of slightly temperature dependence, the OFF-state transport follows Frenkel-Poole mechanism and Arrhenius plot detects a single trap at 0.37 eV. An equivalent circuit model derived from the combined impedance-modulus spectra is proposed to characterize the real IS response. The extracted film capacitance and contact resistance keep constant at 25-100 degrees C and, by contrast, the film resistance reveals activation energy of 0.08 eV. Both I-V and IS analyses indicate the domination of the OFF-state film conduction on the observed RS behavior and thermal effect. For doped perovskites, the OFF-state electrical property is associated with the presence of film-interior oxygen vacancies. (C) 2013 AIP Publishing LLC.
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