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Title: Local structures of polar wurtzites Zn1-xMgxO studied by raman and 67Zn/25Mg NMR spectroscopies and by total neutron scattering

Abstract

Research in the area of polar semiconductor heterostructures has been growing rapidly, driven in large part by interest in two-dimensional electron gas (2DEG) systems. 2DEGs are known to form at heterojunction interfaces that bear polarization gradients. They can display extremely high electron mobilities, especially at low temperatures, owing to spatial confinement of carrier motions. Recent reports of 2DEG behaviors in Ga{sub 1-x}Al{sub x}N/GaN and Zn{sub 1-x}Mg{sub x}O/ZnO heterostructures have great significance for the development of quantum Hall devices and novel high-electron-mobility transistors (HEMTs). 2DEG structures are usually designed by interfacing a polar semiconductor with its less or more polar alloys in an epitaxial manner. Since the quality of the 2DEG depends critically on interface perfection, as well as the polarization gradient at the heterojunction, understanding compositional and structural details of the parent and alloy semiconductors is an important component in 2DEG design and fabrication. Zn{sub 1-x}Mg{sub x}O/ZnO is one of the most promising heterostructure types for studies of 2DEGs, due to the large polarization of ZnO, the relatively small lattice mismatch, and the large conduction band offsets in the Zn{sub 1-x}Mg{sub x}O/ZnO heterointerface. Although 2DEG formation in Zn{sub 1-x}Mg{sub x}O/ZnO heterostructures have been researched for some time, a clear understandingmore » of the alloy structure of Zn{sub 1-x}Mg{sub x}O is currently lacking. Here, we conduct a detailed and more precise study of the local structure of Zn{sub 1-x}Mg{sub x}O alloys using Raman and solid-state nuclear magnetic resonance (NMR), in conjunction with neutron diffraction techniques.« less

Authors:
 [1];  [2];  [2];  [2];  [3];  [2];  [2]
  1. Los Alamos National Laboratory
  2. UCSB
  3. UNIV OF TENNESSEE
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
960598
Report Number(s):
LA-UR-08-05431; LA-UR-08-5431
Journal ID: ISSN 1098-0121; TRN: US201006%%1239
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALLOYS; CARRIERS; CONFINEMENT; DESIGN; ELECTRON GAS; ELECTRONS; FABRICATION; HETEROJUNCTIONS; INTERFACES; MAGNESIUM OXIDES; NEUTRON DIFFRACTION; NUCLEAR MAGNETIC RESONANCE; POLARIZATION; RAMAN SPECTROSCOPY; SCATTERING; SEMICONDUCTOR MATERIALS; SPECTROSCOPY; TEMPERATURE RANGE 0065-0273 K; TRANSISTORS; ZINC OXIDES

Citation Formats

Proffen, Thomas E, Kim, Yiung- Il, Cadars, Sylvian, Shayib, Ramzy, Feigerle, Charles S, Chmelka, Bradley F, and Seshadri, Ram. Local structures of polar wurtzites Zn1-xMgxO studied by raman and 67Zn/25Mg NMR spectroscopies and by total neutron scattering. United States: N. p., 2008. Web.
Proffen, Thomas E, Kim, Yiung- Il, Cadars, Sylvian, Shayib, Ramzy, Feigerle, Charles S, Chmelka, Bradley F, & Seshadri, Ram. Local structures of polar wurtzites Zn1-xMgxO studied by raman and 67Zn/25Mg NMR spectroscopies and by total neutron scattering. United States.
Proffen, Thomas E, Kim, Yiung- Il, Cadars, Sylvian, Shayib, Ramzy, Feigerle, Charles S, Chmelka, Bradley F, and Seshadri, Ram. 2008. "Local structures of polar wurtzites Zn1-xMgxO studied by raman and 67Zn/25Mg NMR spectroscopies and by total neutron scattering". United States. https://www.osti.gov/servlets/purl/960598.
@article{osti_960598,
title = {Local structures of polar wurtzites Zn1-xMgxO studied by raman and 67Zn/25Mg NMR spectroscopies and by total neutron scattering},
author = {Proffen, Thomas E and Kim, Yiung- Il and Cadars, Sylvian and Shayib, Ramzy and Feigerle, Charles S and Chmelka, Bradley F and Seshadri, Ram},
abstractNote = {Research in the area of polar semiconductor heterostructures has been growing rapidly, driven in large part by interest in two-dimensional electron gas (2DEG) systems. 2DEGs are known to form at heterojunction interfaces that bear polarization gradients. They can display extremely high electron mobilities, especially at low temperatures, owing to spatial confinement of carrier motions. Recent reports of 2DEG behaviors in Ga{sub 1-x}Al{sub x}N/GaN and Zn{sub 1-x}Mg{sub x}O/ZnO heterostructures have great significance for the development of quantum Hall devices and novel high-electron-mobility transistors (HEMTs). 2DEG structures are usually designed by interfacing a polar semiconductor with its less or more polar alloys in an epitaxial manner. Since the quality of the 2DEG depends critically on interface perfection, as well as the polarization gradient at the heterojunction, understanding compositional and structural details of the parent and alloy semiconductors is an important component in 2DEG design and fabrication. Zn{sub 1-x}Mg{sub x}O/ZnO is one of the most promising heterostructure types for studies of 2DEGs, due to the large polarization of ZnO, the relatively small lattice mismatch, and the large conduction band offsets in the Zn{sub 1-x}Mg{sub x}O/ZnO heterointerface. Although 2DEG formation in Zn{sub 1-x}Mg{sub x}O/ZnO heterostructures have been researched for some time, a clear understanding of the alloy structure of Zn{sub 1-x}Mg{sub x}O is currently lacking. Here, we conduct a detailed and more precise study of the local structure of Zn{sub 1-x}Mg{sub x}O alloys using Raman and solid-state nuclear magnetic resonance (NMR), in conjunction with neutron diffraction techniques.},
doi = {},
url = {https://www.osti.gov/biblio/960598}, journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 2008},
month = {Tue Jan 01 00:00:00 EST 2008}
}