Effect of oxygen adsorption on polaron conduction in nanometer-scale Nb[5+]-, Fe[3+]-, and Cr[3+]-doped SrTiO3 thin films

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  • Effect of oxygen adsorption on polaron conduction in nanometer scale Nb 5 Fe 3 and Cr 3 doped SrTiO3 thin films

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<jats:p> In this study, the effect of oxygen (O<jats:sub>2</jats:sub>) adsorption on polaron conduction in nanometer-scale Nb<jats:sup>5+</jats:sup>-, Fe<jats:sup>3+</jats:sup>-, and Cr<jats:sup>3+</jats:sup>-doped SrTiO<jats:sub>3</jats:sub> thin films was investigated. The SrTiO<jats:sub>3</jats:sub>-based thin films were epitaxially grown onto SrTiO<jats:sub>3</jats:sub>(001) single-crystal substrates by pulsed laser deposition (PLD). It was found that polaron diameter decreases owing to O<jats:sub>2</jats:sub> adsorption; this can be understood by assuming that O<jats:sub>2</jats:sub> adsorbates induce local distortions of TiO<jats:sub>6</jats:sub> unit cells, at which conduction electrons are frequently trapped. Furthermore, the polaron diameter of Sr(Ti,Nb)O<jats:sub>3</jats:sub> and Sr(Ti,Fe)O<jats:sub>3</jats:sub> exhibited less dependence on O<jats:sub>2</jats:sub> concentration than that of Sr(Ti,Cr)O<jats:sub>3</jats:sub>; this can be explained by the shielding of electron–phonon interaction by doped electrons in Sr(Ti,Nb)O<jats:sub>3</jats:sub>, and by the electronic structure of Sr(Ti,Fe)O<jats:sub>3</jats:sub>. </jats:p>

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