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000052507 084__ $$2WoS$$aMaterials Science, Ceramics
000052507 1001_ $$0P:(DE-Juel1)VDB3101$$aOhly, C.$$b0$$uFZJ
000052507 245__ $$aElectrical conductivity of epitaxial SrTiO3 thin films as a function of oxygen partial pressure and temperature
000052507 260__ $$aOxford [u.a.]$$bWiley-Blackwell$$c2006
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000052507 520__ $$aSrTiO3 (100) epitaxial films with thicknesses of 3, 1 μm, and 250 nm were prepared on MgO (100) substrates by pulsed-laser deposition. The electrical conductivities of the thin films were systematically investigated as a function of temperature and ambient oxygen partial pressure. This was made possible by using a specially designed measurement setup, allowing the reliable determination of resistances of up to 25 GΩ in the temperature range of 600°–1000°C under continuously adjustable oxygen partial pressures ranging from 10−20 to 1 bar. The capabilities of the measurement setup were tested thoroughly by measuring a SrTiO3 single crystal. The well-known characteristics, e.g., the decline of the conductivity with a slope of –1/4 under reducing conditions and the opposite +1/4 behavior in oxidizing atmospheres, are found in the log(σ)–log(pO2) profiles of the epitaxial films. However, the p-type conductivity decreases, and the n-type conductivity increases with decreasing film thickness. This phenomenon is attributed to the charge carrier redistribution in the surface space charge layers. Owing to the high surface-to-volume ratio, the space charge layers play an important role in thin films.
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000052507 7001_ $$0P:(DE-Juel1)128631$$aSchubert, J.$$b3$$uFZJ
000052507 7001_ $$0P:(DE-Juel1)131022$$aWaser, R.$$b4$$uFZJ
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000052507 8567_ $$uhttp://dx.doi.org/10.1111/j.1551-2916.2006.01178.x
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