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Electrically Coupling Multifunctional Oxides to Semiconductors: A Route to Novel Material Functionalities

Published online by Cambridge University Press:  04 February 2016

J. H. Ngai ,
K. Ahmadi-Majlan ,
J. Moghadam ,
M. Chrysler ,
D. P. Kumah ,
C. H. Ahn ,
F. J. Walker ,
T. Droubay ,
M. Bowden  and
S. A. Chambers
...Show all authors
J. H. Ngai*
Affiliation:
Department of Physics, University of Texas-Arlington, Arlington, TX 76019, U.S.A.
K. Ahmadi-Majlan
Affiliation:
Department of Physics, University of Texas-Arlington, Arlington, TX 76019, U.S.A.
J. Moghadam
Affiliation:
Department of Physics, University of Texas-Arlington, Arlington, TX 76019, U.S.A.
M. Chrysler
Affiliation:
Department of Physics, University of Texas-Arlington, Arlington, TX 76019, U.S.A.
D. P. Kumah
Affiliation:
Department of Applied Physics and Center for Research on Interface Structures and Phenomena,Yale University, New Haven, CT 06511, U.S.A.
C. H. Ahn
Affiliation:
Department of Applied Physics and Center for Research on Interface Structures and Phenomena,Yale University, New Haven, CT 06511, U.S.A.
F. J. Walker
Affiliation:
Department of Applied Physics and Center for Research on Interface Structures and Phenomena,Yale University, New Haven, CT 06511, U.S.A.
T. Droubay
Affiliation:
Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352, U.S.A.
M. Bowden
Affiliation:
Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, U.S.A.
S. A. Chambers
Affiliation:
Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352, U.S.A.
X. Shen
Affiliation:
Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, U.S.A.
D. Su
Affiliation:
Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, U.S.A.
*
*(Email: jngai@uta.edu)
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Abstract

Complex oxides and semiconductors exhibit distinct yet complementary properties owing to their respective ionic and covalent natures. By electrically coupling oxides to semiconductors within epitaxial heterostructures, enhanced or novel functionalities beyond those of the constituent materials can potentially be realized. Key to electrically coupling oxides to semiconductors is controlling the physical and electronic structure of semiconductor – crystalline oxide heterostructures. Here we discuss how composition of the oxide can be manipulated to control physical and electronic structure in Ba1-xSrxTiO3/ Ge and SrZrxTi1-xO3/Ge heterostructures. In the case of the former we discuss how strain can be engineered through composition to enable the re-orientable ferroelectric polarization to be coupled to carriers in the semiconductor. In the case of the latter we discuss how composition can be exploited to control the band offset at the semiconductor - oxide interface. The ability to control the band offset, i.e. band-gap engineering, provides a pathway to electrically couple crystalline oxides to semiconductors to realize a host of functionalities.

Keywords

oxidemolecular beam epitaxy (MBE)ferroelectric
Type
Articles
Information
MRS Advances , Volume 1 , Issue 4: Electronics and Photonics , 2016 , pp. 255 - 263
Copyright
Copyright © Materials Research Society 2016 

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References

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