Stoichiometry optimization of homoepitaxial oxide thin films using x-ray diffraction

James M. Lebeau, Roman Engel-Herbert, Bharat Jalan, Joël Cagnon, Pouya Moetakef, Susanne Stemmer, G. Brian Stephenson

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Homoepitaxial SrTiO3 thin films grown by molecular beam epitaxy are analyzed using high-resolution x-ray diffraction and transmission electron microscopy. Measured 00L x-ray scans from stoichiometric and nonstoichiometric films are compared with calculations that account for the effects of film thickness, lattice parameter, fractional site occupancy, and an offset between film and substrate at the interface. It is found that thickness fringes, commonly observed around Bragg reflections even in stoichiometric homoepitaxial SrTiO3 films, arise from a film/substrate interface offset. Transmission electron microscopy studies confirm the presence of strain at those homoepitaxial interfaces that show an offset in x-ray diffraction. The consequences for stoichiometry optimization of homoepitaxial films using high-resolution x-ray diffraction and the quality of regrown oxide interfaces are discussed.

Original languageEnglish (US)
Article number142905
JournalApplied Physics Letters
Volume95
Issue number14
DOIs
StatePublished - Oct 21 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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