Kinetic pathway of the ferroelectric phase formation in doped HfO2 films

Lun Xu, Tomonori Nishimura, Shigehisa Shibayama, Takeaki Yajima, Shinji Migita, Akira Toriumi

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58 Citations (Scopus)

Abstract

The dopant-induced ferroelectric HfO2 formation has been systematically investigated by using cation (Sc, Y, Nb, Al, Si, Ge, and Zr) and anion (N) dopants. Both differences and similarities are discussed among various dopants by focusing on two major factors, the oxygen vacancy (Vo) and the dopant ionic size. First, the doping concentration dependence of the remanent polarization in 27 (±2) nm HfO2 films is quantitatively estimated. Then, by comparing the polarization result with the structural transformation in doped HfO2, the pathway of the dopant-induced HfO2 phase transition is discussed among monoclinic, ferroelectric orthorhombic, tetragonal, and cubic phases. Finally, it is addressed that a dopant species independent phase transition route may exist in HfO2 owing to the same kinetic transition process, in which the ferroelectric phase seems to be at an intermediate state between tetragonal and monoclinic phases.

Original languageEnglish
Article number124104
JournalJournal of Applied Physics
Volume122
Issue number12
DOIs
Publication statusPublished - Sep 28 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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