Current‐voltage characteristics of capacitor structures based on PZT thin films grown on Nb‐doped SrTiO3 substrates

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Current measurements, as functions of voltage (I –V curves), at different temperatures were carried out in SrTiO3+Nb/Pb(Zr0.52Ti0.48)O3/Ag capacitor structures grown on (100) SrTiO3 Nb‐doped substrates by using a technique of high‐oxygen pressure on axis sputtering. Crystalline quality and structure were measured by X‐ray diffractometry (XRD). Surface roughness and morphology were studied by atomic force microscopy (AFM). Ferroelectric characterization was conducted by P –E hysteresis loops on different capacitors with electrode areas of 5.0×10–4 and 6.5×10–3 cm2. Conductance measurements revealed a hopping mechanism of conduction through 2 or 3 localized states in the range of temperatures between 130 K and 40 K. On the other hand, in the temperature range between 385 K and 180 K, our results fit very well with the variable range hopping (VRH) model. The measurements of current as a function of voltage on SrTiO3+Nb/PZT/Ag structures showed typical electronic tunneling behavior. The process of electronic tunneling through capacitive structures can be interpreted as a transition from hopping mechanisms via N localized states to variable range hopping, when temperature is increased.
Idioma originalEspañol (Colombia)
Páginas (desde-hasta)4081-4086
Número de páginas6
PublicaciónPhysica Status Solidi (C) Current Topics in Solid State Physics
EstadoPublicada - nov 2007

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