Thermodynamic Ground States of Complex Oxide Heterointerfaces

被引：35

作者：

Gunkel, F. ^{[1
]}

Hoffmann-Eifert, S. ^{[2
,3
]}

Heinen, R. A. ^{[2
,3
]}

Christensen, D. V. ^{[4
]}

Chen, Y. Z. ^{[4
]}

Pryds, N. ^{[4
]}

Waser, R. ^{[2
,3
]}

Dittmann, R. ^{[2
,3
]}

机构：

[1] Rhein Westfal TH Aachen, IWE2, Inst Elect Mat, D-52056 Aachen, Germany

[2] Forschungszentrum Julich, Peter Gruenberg Inst, D-52425 Julich, Germany

[3] Forschungszentrum Julich, JARA FIT, D-52425 Julich, Germany

[4] Tech Univ Denmark, Dept Energy Convers & Storage, Riso Campus, DK-4000 Roskilde, Denmark

来源：

ACS APPLIED MATERIALS & INTERFACES | 2017年 / 9卷 / 01期

关键词：

oxide heterointerfaces; 2DEG; defect-chemistry; thermodynamics; interface chemistry; 2-DIMENSIONAL ELECTRON-GAS; MOBILITY; INTERFACES; HETEROSTRUCTURES; CONDUCTIVITY; CREATION; CHARGE;

D O I：

10.1021/acsami.6b12706

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The formation mechanism of 2-dimensional electron gases (2DEGs) at heterointerfaces between nominally insulating oxides is addressed with a thermodynamical approach. We provide a comprehensive analysis of the thermodynamic ground states of various 2DEG systems directly probed in high temperature equilibrium conductivity measurements. We unambiguously identify two distinct classes of oxide heterostructures: For epitaxial perovskite/perovskite heterointerfaces (LaAlO3/SrTiO3, NdGaO3/SrTiO3, and (La,Sr)(Al,Ta)O-3/SrTiO3), we find the 2DEG formation being based on charge transfer into the interface, stabilized by the electric field in the space charge region. In contrast, for amorphous LaAlO3/SrTiO3 and epitaxial gamma-Al2O3/SrTiO3 heterostructures, the 2DEG formation mainly relies on the formation and accumulation of oxygen vacancies. This class of 2DEG structures exhibits an unstable interface reconstruction associated with a quenched nonequilibrium state.

引用

页码：1086 / 1092

页数：7

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