Dielectric constant boost in amorphous sesquioxides

Details Dielectric constant boost in amorphous sesquioxides Dielectric constant boost in amorphous sesquioxides

2008-03-12

arxiv.org/abs/0803.1855v1

APPLIED PHYSICS LETTERS 92, 172903 (2008)

Physics

Condensed Matter

Materials Science

3 pages, 3 figures, submitted to APL

Scientific paper

10.1063/1.2917797

High-kappa dielectrics for insulating layers are a current key ingredient of microelectronics. X2O3 sesquioxide compounds are among the candidates. Here we show for a typical material of this class, ScO3, that the relatively modest dielectric constant of its crystalline phase is enhanced in the amorphous phase by over 40% (from ~15 to ~22). This is due to the disorder-induced activation of low frequency cation-related modes which are inactive or inefficient in the crystal, and by the conservation of effective dynamical charges (a measure of atomic polarizability). The analysis employs density-functional energy-force and perturbation-theory calculations of the dielectric response of amorphous samples generated by pair-potential molecular dynamics.

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