Band gap and mobility of epitaxial perovskite BaSn1-xHfx O3 thin films

Juyeon Shin, Jinyoung Lim, Taewoo Ha, Young Mo Kim, Chulkwon Park, Jaejun Yu, Jae Hoon Kim, Kookrin Char

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A wide band-gap perovskite oxide BaSnO3 is attracting much attention due to its high electron mobility and oxygen stability. On the other hand, BaHfO3 was recently reported to be an effective high-k gate oxide. Here, we investigate the band gap and mobility of solid solutions of BaSn1-xHfxO3 (x=0-1) (BSHO) as a basis to build advanced perovskite oxide heterostructures. All the films were epitaxially grown on MgO substrates using pulsed laser deposition. Density functional theory calculations confirmed that Hf substitution does not create midgap states while increasing the band gap. From x-ray diffraction and optical transmittance measurements, the lattice constants and the band-gap values are significantly modified by Hf substitution. We also measured the transport properties of n-type La-doped BSHO films [(Ba,La)(Sn,Hf)O3], investigating the feasibility of modulation doping in the BaSnO3/BSHO heterostructures. The Hall measurement data revealed that, as the Hf content increases, the activation rate of the La dopant decreases and the scattering rate of the electrons sharply increases. These properties of BSHO films may be useful for applications in various heterostructures based on the BaSnO3 system.

Original languageEnglish
Article number021601
JournalPhysical Review Materials
Volume2
Issue number2
DOIs
Publication statusPublished - 2018 Feb 9

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

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