Effect of grain boundaries on hydrocarbon sensing in Fe-doped p-type semiconducting perovskite SrTiO3 films | Zendy

M. Mahesh Kumar | Zendy; Michael L. Post | Zendy

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Effect of grain boundaries on hydrocarbon sensing in Fe-doped p-type semiconducting perovskite SrTiO3 films

Author(s) -

M. Mahesh Kumar,

Michael L. Post

Publication year - 2005

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.1922584

Subject(s) - sapphire , materials science , grain boundary , conductivity , depletion region , pulsed laser deposition , analytical chemistry (journal) , thin film , thermal conduction , propane , doping , relaxation (psychology) , electrical resistivity and conductivity , ionic conductivity , microstructure , condensed matter physics , electrode , composite material , optoelectronics , chemistry , layer (electronics) , nanotechnology , optics , electrolyte , electrical engineering , laser , engineering , psychology , social psychology , chromatography , physics , organic chemistry

Films of Fe-doped SrTiO3 deposited using pulsed laser deposition on sapphire and alumina, when exposed to propane, showed different sensor responses measured sas a resistance changed as a function of temperature and microstructure. The film deposited on alumina has a stronger response towards 3000-ppm propane than does the film deposited on sapphire. Films deposited on alumina exhibit higher dc conductivity than the films on sapphire. The activation energies indicate a mixed electronic/ionic conduction at low temperature with the high-temperature regime showing a temperature-independent conductivity. The origin of the difference in gas responses caused by varying temperature and morphology has been explored using ac impedance techniques and measured as a function of frequency s1 Hz\uf8f\uf81 MHzd and temperature s200\uf8T\uf8480 \ub0Cd. A single relaxation sa single semicircle in the complex impedance planed in the frequency domain was observed in addition to the relaxation due to the electrode-film interface. A model and a mechanism of conduction for the above are derived using equivalent circuits to fit the ac impedance data and dc conductivity. It is proposed that the reduction of Fe-doped SrTiO3, which is induced by propane, enhances the space-charge barrier near the grain boundaries and increases the sensitivity to propane.Peer reviewed: YesNRC publication: Ye

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