Phonon scattering limited mobility in the representative cubic perovskite semiconductors SrGeO${}_3$, BaSnO${}_3$ and SrTiO${}_3$

Abstract

Cubic perovskite oxides are emerging high-mobility transparent conducting oxides (TCOs), but Ge-based TCOs had not been known until the discovery of metastable cubic SrGeO${}_3$. $0.5\times 0.4\times 0.2$-mm${}^3$ large single crystals of the cubic SrGeO${}_3$ perovskite were successfully synthesized employing the high-pressure flux method. The phonon spectrum is determined from the IR optical reflectance and Raman-scattering analysis to evaluate the electron transport governed by optical phonon scattering. A calculated room-temperature mobility on the order of $3.9\times 10^2$ cm${}^2$V${}^{-1}$s${}^{-1}$ is obtained, identifying cubic SrGeO${}_3$ as one of the most promising TCOs. Employing classical phonon theory and a combined experimental-theoretical approach, a comprehensive analysis of the intrinsic electron mobility in the cubic perovskite semiconductors SrGeO${}_3$, BaSnO${}_3$, and SrTiO${}_3$ is provided based on the magnitude of polarization and eigenfrequency of optically active phonons.

28 pages, 9 figures

References in corpus (6)

• High Mobility in a Stable Transparent Perovskite Oxide
• Physical properties of transparent perovskite oxides (Ba,La)SnO3 with high electrical mobility at room temperature
• Intrinsic Mobility Limiting Mechanisms in Lanthanum-doped Strontium Titanate
• First-principles analysis of electron transport in BaSnO${}_3$
• Electron effective mass and mobility limits in degenerate perovskite stannate BaSnO${}_3$
• Crystal structure built from a GeO${}_6$-GeO${}_5$ polyhedra network with high thermal stability: $\beta$-SrGe${}_2$O${}_5$

Cited by in corpus (6)

• Electron effective mass and mobility limits in degenerate perovskite stannate BaSnO${}_3$
• Shallow Valence Band of Rutile GeO${}_2$ and P-type Doping
• Real-Space Visualization of Frequency-Dependent Anisotropy of Atomic Vibrations
• Low-loss tunable infrared plasmons in the high-mobility perovskite (Ba,La)SnO${}_3$
• Strongly confined Mid-infrared to Terahertz Phonon Polaritons in Ultra-thin SrTiO3
• Favorable band alignment for photocatalysis at the strontium germanate interface with silicon