PMID- 27992161
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20180727
LR  - 20180727
IS  - 1944-8252 (Electronic)
IS  - 1944-8244 (Linking)
VI  - 9
IP  - 1
DP  - 2017 Jan 11
TI  - Thermodynamic Ground States of Complex Oxide Heterointerfaces.
PG  - 1086-1092
LID - 10.1021/acsami.6b12706 [doi]
AB  - 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 (LaAlO(3)/SrTiO(3), NdGaO(3)/SrTiO(3), and 
      (La,Sr)(Al,Ta)O(3)/SrTiO(3)), 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 LaAlO(3)/SrTiO(3) and epitaxial 
      gamma-Al(2)O(3)/SrTiO(3) 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.
FAU - Gunkel, F
AU  - Gunkel F
AUID- ORCID: 0000-0003-1178-9986
AD  - Institute of Electronic Materials, IWE2, RWTH Aachen University , 52056 Aachen, 
      Germany.
FAU - Hoffmann-Eifert, S
AU  - Hoffmann-Eifert S
AD  - Peter Gruenberg Institute and JARA-FIT, Forschungszentrum Juelich GmbH , 52425 
      Juelich, Germany.
FAU - Heinen, R A
AU  - Heinen RA
AD  - Peter Gruenberg Institute and JARA-FIT, Forschungszentrum Juelich GmbH , 52425 
      Juelich, Germany.
FAU - Christensen, D V
AU  - Christensen DV
AD  - Department of Energy Conversion and Storage, Technical University of Denmark , 
      Riso Campus, 4000 Roskilde, Denmark.
FAU - Chen, Y Z
AU  - Chen YZ
AD  - Department of Energy Conversion and Storage, Technical University of Denmark , 
      Riso Campus, 4000 Roskilde, Denmark.
FAU - Pryds, N
AU  - Pryds N
AD  - Department of Energy Conversion and Storage, Technical University of Denmark , 
      Riso Campus, 4000 Roskilde, Denmark.
FAU - Waser, R
AU  - Waser R
AD  - Peter Gruenberg Institute and JARA-FIT, Forschungszentrum Juelich GmbH , 52425 
      Juelich, Germany.
FAU - Dittmann, R
AU  - Dittmann R
AD  - Peter Gruenberg Institute and JARA-FIT, Forschungszentrum Juelich GmbH , 52425 
      Juelich, Germany.
LA  - eng
PT  - Journal Article
DEP - 20161219
PL  - United States
TA  - ACS Appl Mater Interfaces
JT  - ACS applied materials & interfaces
JID - 101504991
OTO - NOTNLM
OT  - 2DEG
OT  - defect-chemistry
OT  - interface chemistry
OT  - oxide heterointerfaces
OT  - thermodynamics
EDAT- 2016/12/20 06:00
MHDA- 2016/12/20 06:01
CRDT- 2016/12/20 06:00
PHST- 2016/12/20 06:00 [pubmed]
PHST- 2016/12/20 06:01 [medline]
PHST- 2016/12/20 06:00 [entrez]
AID - 10.1021/acsami.6b12706 [doi]
PST - ppublish
SO  - ACS Appl Mater Interfaces. 2017 Jan 11;9(1):1086-1092. doi: 
      10.1021/acsami.6b12706. Epub 2016 Dec 19.