Profile
Taekjib Choi
Ph.
D., Assistant Professor
Hybrid Materials Research Center Department of Nanotechnology and Advanced
Materials Engineering Sejong University, Seoul 143-747 (Korea) E-mail: tjchoi@sejong.ac.kr Tel: 82-2-3408-3871 |
Education
(Department
of Materials Science and Engineering, Sung
Thesis:
Nano domain engineering of ferroelectric PbZrO3/PbTiO3
artificial superlattice by scanning probe microscopy
MASTER OF SCIENCE
(M.S.) IN MATERIALS SCIENCE (2000 ~ 2002)
(Department
of Materials Science and Engineering, Sung
Thesis:
Low-temperature process of Bi modified YMnO3 thin films and its
structural and electrical properties
BACHELOR OF
SCIENCE (B.S.) IN METALLURGICAL ENGINEERING (1993~2000)
(Department
of Metallurgical Engineering, Sung
l
Multifunctional complex oxide
nanostructures for energy and advanced electronic devices
l
Photovoltaic devices and nano-electronic
devices
l
Nanostructured oxide semiconductors for solar
water splitting
l
Nano-composites for battery
l
Heterointerface of complex oxides for
novel functionalities
2010/01
~ 2011/02, Post-doctoral Research associate, Thin Films & Nanostructures
Group, Materials Science & Technology Division, Oak Ridge National
Laboratory
(Leader:
Dr. Hans Christen, Supervisor: Dr. H N Lee)
l
Designing materials atom-by-atom for
discovering novel functional complex oxides through understanding and
controlling atomic-scale interfaces.
l
Heteroepitaxy of polar oxides and
correlated electron heterostructures.
l
Photovoltaics devices, field effect
transistors and tunnel junctions devices
2008/01
~ 2010/01, Post-doctoral fellow (Korea research foundation and Rutgers center
for emergent materials), Dept. of Physics & Astronomy, Rutgers University
(Supervisor:
Prof. S.-W. Cheong)
l
Multiferroics oxides for non-volatile memory
devices and photo-electronics: the fabrication of multiferroic capacitor and
the characterization of electric transport properties, ferroelectric domain
structure, photoconductivity, photovoltaic and surface analysis.
l
Nanoscale characterization of ferroelectrics
and multiferroics by scanning probe microscopy: Polarization-modulated
conduction in ferroelectric semiconductor by conductive AFM.
l
Knowledge of physics and materials science
of semiconductor devices, low temperature measurements, charge transport in
solids, ferroelectric domain dynamics, and crystal structure.
2007/02
~ 2007/12, Post-doctoral fellow (Brain Korea 21), Sung Kyun Kwan University
(Supervisor: Prof. J. Lee)
l
Transition metal oxide for resistive
random access memory.
l
Oxide artificial superlattice for
non-volatile memory devices.
2002
~ 2007 (Ph. D. course), Research Assistant, Sung Kyun Kwan University
(Supervisor:
Prof. J. Lee)
l
Design and Construction of vacuum system:
Laser Molecular Beam Epitaxy (Laser-MBE) with high pressure RHEED system,
Pulsed Laser Deposition system
l
Knowledge of Labview programming (user
interface)
l
Nanoscale characterization by Scanning
Probe Microscopy (PFM, CAFM, SCM, KFM) : domain dynamic and domain structure of
ferroelectric superlattice, local electric transport properties of metallic
oxide
l
Epitaxial growth of oxide heterostructures
and oxide artificial superlattice by a pulsed laser deposition
l
Microstructure analysis of oxide thin
films (XRD-RSM, Synchrotron-XRD, TEM) : 2 dimensional domain structure analysis
in superlattice and strain and stress analysis in epitaxial films
l
Ferroelectric properties of thin films
(Impedance analysis)
l
Transport properties of transition metal
oxide thin films for resistive memory: CAFM, I-V
l
Teaching Assistant, Department of
Materials Science and Engineering, Sung
2000
~ 2002 (M.S. course), Research Assistant, Sung Kyun Kwan University
(Supervisor:
Prof. J. Lee)
l
Growth of epitaxial ferroelectric thin
films on Si using pulsed laser deposition
l
Ferroelectric thin films for non-volatile
memory application (FRAM): Metal-Ferroelectric-Insulator-Semiconductor
(MFIS)-FET
l
Electrical characterization for
ferroelectric devices : C-V, C-F, P-E, I-V
l
Microstructure of ferroelectric thin films
: XRD, SPM, TEM, SEM
l
Surface characterization of ferroelectric
thin films :AES, XPS, SIMS
l
Basic semiconductor process
(Inter-university semiconductor research center in Seoul National Univ.)
Selected
Publications
1.
Y. Park*, J. S. Choi*, T. Choi*, M. J. Lee, Q.
Jia, M. Park, H. Lee, and B. H. Park, “ Configuration of ripple domains and
their topological defects formed under local mechanical stress on hexagonal
monolayer graphene”, Scientific Reports 5, 9390, 2015
2.
S. Hong*, T. Choi*, J. H. Jeon, Y. Kim, H. Lee, H.-Y. Joo, I. Hwang,
J.-S. Kim, S.-O. Kang, S. V. Kalinin, and B. H. Park, “Large resistive
switching in ferroelectric BiFeO3 nano-island based switchable
diodes”, Advanced Materials 25, 2339, 2013
3. T. Choi, L. Jiang, S.
Lee, T. Egami, and H. N. Lee, "High rectification and photovoltaic effect
in oxide nano-junctions", New Journal of Physics 14, 093056, 2012
4.
W. S. Choi, M. F. Chisholm, D. J. Singh,
T. Choi, G. E. Jellison Jr.,
and H. N. Lee, "Wide bandgap tunability in complex transition metal oxides
by site-specific substitution", Nature communications 3, 689, 2012
5.
H. T. Yi, T. Choi, S. G. Choi, Y. S. Oh, and S.-W. Cheong, “Mechanism
of the switchable photovoltaic effect in ferroelectric BiFeO3”, Advanced
Materials 23, 3403, 2011
6.
W. Wu, J. R. Guest, Y. Horibe, S. Park, T. Choi, S-W. Cheong, and M.
Bode, “Polarization-Modulated Rectification at Ferroelectric Surfaces”, Physical
Review Letters 104, 217601, 2010
7.
T. Choi, Y. Horibe,
H. T. Yi , Y. J. Choi, W. Wu, and S-W. Cheong, “Insulating Interlocked Ferroelectric and
Structural Antiphase Domain Walls in Multiferroic YMnO3”, Nature
Materials 9, 253, 2010
8.
B. Lee, T. Choi, S-W. Cheong, and V. Podzorov, “Nanoscale conducting
channels at the surface of organic crystals formed by decoration of molecular
steps with self-assembled molecules”, Advanced Functional materials 19,
3726, 2009
9.
T. Choi, S.
Lee, Y. J. Choi, V. Kiryukhin, and S-W. Cheong, “Switchable Ferroelectric Diode
and Photovoltaic effect in BiFeO3”, Science 324, 63, 2009
