Effect of interfaces on the electrical behavior of (Pb 0.72La0.28)TiO3 thin films

J. J. Lee, P. Alluri, Sandwip Dey

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Paraelectric (Pb0.72La0.28)TiO3 or PLT(28) thin films were deposited on platinum coated Si substrates by the sol-gel technique. Two distinct groups of top metals, namely MT (Ni, Cr, and Ti, i.e., transition metals) and MN (Pt, Au, and Ag, i.e., noble metals) formed Ohmic and Schottky contacts, respectively. A Schottky barrier height of 1.83 eV at the Pt-PLT interface was determined. The conventional Schottky emission and Fowler-Nordheim tunneling equations were modified to account for the voltage dependence of the interfacial permittivity. It was found that Schottky emission, thermionic tunneling, and Fowler-Nordheim tunneling mechanisms were predominant in the voltage ranges of 2<V<7, 7<V<16, and V≳16, respectively.

Original languageEnglish (US)
Pages (from-to)2027-2029
Number of pages3
JournalApplied Physics Letters
Issue number16
StatePublished - Dec 1 1994


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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