제목 없음
- Synthesis of 1-D and 2-D nanostructures by CVD
I have experienced the synthesis of various 1-D and 2-D single crystalline nanostructures by CVD during my MS and Ph.D. course. I have trained analysis instruments such as SEM, AFM, XRD and TEM for characteristics of as-grown nanostructures. The material groups that I involved are followed as below;
Metal-silicide/germanide nanowires (ConSi, Fe1-xCoxSi, NixSiy, MnSi, CoGe, FeSi, V5Si3, (Nb0.94V0.06)10(SixGe1-x)7), Semiconductor nanowires (InN, NbO2, ZnO), Topological insulator nanowires/nanoribbons (Ag2Te, Ag2Se, Bi2Te3)
- Large scaled epitaxial layer growth of III-V group materials on Si wafer by MOCVD
For the development of next-generation III-V logic transistor, the epitaxial growth of III-V materials (GaAs, InGaAs, InP) as promising candidates on silicon substrates is performed by MOCVD for about 1 year.
- Electronic and magneto-transport properties of metal/semiconductor nanostructure devices
By nanodevice fabrication with as-grown nanostructures, research of electrical and magnetic transport properties was carried out. I have experienced high-class cleanroom usage for making nanodevices like EBL, sputter, evaporator, ICP etcher and chemical bench. Main works were the measurement of temperature dependent magnetoresistance using measuring tools connected with PPMS/cryogenic He3 refrigerator.
- Memristive properties (neuromorphic devices) of metal oxide nanowires
I have studied memristors for artificial neuromorphic devices since joining at TCD. ZnO nanowires for memristors are successfully synthesized and observed peculiar memristive behavior showing multilevel resistance switching.
- Activation phenomenon of nanowires network system under magnetic field
I explored the Ni/NiO nanowire-nanowire junctions through temperature-dependent resistance and magnetoresistance measurements. These experiments suggest that it may be possible to encode magnetic and electronic information simultaneously into a semiconducting filaments, potentially doubling the memory density of the device.
- Transition metal doped topological insulator in bulk system
Since joined Sogang university, my research topics are expended from nanostructures to bulk system. I have mainly conducted the research on how physical properties of topological insulators are evolved and changed when magnetic transition ions are insulted in topological insulators. Non-trivial topological surface state depending on gap opening affected by magnetic impurities is one of the most fascinative phenomenon in condensed materials physics.
Assistant Professor.
Department of Physics and Astronomy, Sejong University,
209 Seungdong-ro, Gwangjin-gu, Seoul 05006, Korea
Tel : +82-10-4619-9883
Fax : +82-2-6935-2421
E-mail : kshlee@sejong.ac.kr, kshlee3397@gmail.com
RESEARCH INTERESTS
CONTACT INFORMATION
18. Sean Oliver, Jessamyn Fairfield, Allen Beelew, Sunghun Lee, James G. Champlain, Laura Ruppalt, and John J. Boland, “Quantum Point Contacts and Resistive Switching in Ni/NiO Nanowire Junction”, Applied Physics Leeters, 2016, 109, 203111 (pdf file) (IF : 3.142)
19. Sunghun Lee, Jung-Bong Park, Myoung-Jae Lee, and John J. Boland, “Multilevel Resistance in ZnO Nanowire Memristors Enabled by Hydrogen Annealing Treatment”, AIP Advances, 2016, 6, 125010 (pdf file) (IF : 1.444)
20. Soo-Whan Kim, Sunghun Lee, Ahmad Nauman Shah Saqib, Young Haeng Lee, and Myung-Hwa Jung, “Ferromagnetism in Undoped ZnO Nanostructures Synthesized by Solution Plasma Process”, Cuurent Applied Physics, 2017, 17, 181 (pdf file) (IF : 2.144)
21. Sunghun Lee, Juneho In, Sanghyun Jhi, Yun Chang Park, Jinhee Kim, Bongsoo Kim, and Myung-Hwa Jung, “Three Transition Regions Observed in Single Crystalline Bi-Rich Bi2Te3 Nanobelts”, Science of Advanced Materials, 2017, Accepted. (IF : 1.812)
EDUCATION
Ph. D., Dept. of Chemistry, KAIST Feb. 2009 ~ Aug. 2012 Advisor : Prof. Bongsoo Kim
Thesis title : Nano-structural Materials and Their Physical Properties for Nano-spintronics'
M.S., Dept. of nanoscience and nanotechnology, KAIST Mar. 2006 ~ Feb. 2008 Advisor : Prof. Bongsoo Kim
Thesis title : Fabrication of Nanodevices Using Individual Single Crystalline Nanowire and Their Physical Property Measurements
B.S., Dept. of Physics Mar. 1998 ~ Feb. 2006 Advisor : Prof. Jiyong Park
EXPERIENCE
Research Professor (Myung-Hwa Jung;s group),
Department of Physics, Sogang University, Korea Jun. 2016 ~ current
Research Postdoc Fellow (Myung-Hwa Jung;s group),
Department of Physics, Sogang University, Korea Oct. 2015 ~ May 2016
Research Fellow (John J. Boland group), School of Chemistry
and CRANN, Trinity College Dublin Jul. 2014 ~ Sep. 2015
Research Staff Member, SAIT (Samsung Advanced Institute
of Technology), Korea Sep. 2012 ~ May 2014
Teaching Assistant(experimental class of physical chemistry),
KAIST, Korea Feb. 2009 ~ May 2009
Student for Research (Ph. D),
KRISS (Korea Research Institute of Standard Science), Korea Feb. 2009 ~ Aug. 2012
Assistant Researcher, KRISS, Korea Mar. 2008 ~ Jan. 2009
Student for Research (M.S.), KRISS, Korea Sep. 2006 ~ Feb. 2008
Assistant Researcher, Ajou Univ., Korea Mar. 2004 ~ Feb. 2006
SPECIALITY & SKILLS
- Synthesis and characterization of nanowires
CVD (Chemical Vapor Deposition) system using 1 and 4 inch quartz tube
Nano-manipulator
Vacuum system and thermometer set-up
TEM (Transmission Electron Microscope) – JEOL 2100
MOCVD (Metalorganic CVD) system
- Fabrication of nanodevices
Spin-coater
Photo-mask aligner
Plasma asher
SEM (Scanning Electron Microscope with EDS) – Hitachi, Philips, FEI, and JEOL
AFM (Atomic Force Microscope) – Veeco and STI
Dual FIB (Focused Ion Beam) – FEI (Quanta 3D)
Evaporator – e-beam and thermer
ICP (Ion Coupling Plasma) etcher
Sputter – 6-gun and UHV system
- Measurement of nanowire’s physical properties
PPMS (Physical Property Measurement System) – Quantum Design
He3/He4 refrigator – Oxford
Current and Voltage amplifier
Lock-in amplifier
Probe station and parameter analyzer
Wedge bonder
Hall measurement system (contact / non-contact)
PUBLICATIONS
1. Beom Jun Kim, Dong Myeogn Lee, Sung Hun Lee, and Wan-Suk Gim, “Blood-type Distribution”, Physica A, 2007, 373, 533 (pdf file) (IF : 1.732)
2. Kwanyong Seo, K. S. K. Varadwaj, P. Mohanty, Sunghun Lee, Yonghun Jo, Myung-Hwa Jung, Jinhee Kim, and Bongsoo Kim, “Magnetic Properties of Single Crystalline CoSi Nanowires”, Nano Letters, 2007, 7, 1240 (pdf file) (IF : 13.592)
3. Juneho In, Kumar S. K. Varadwaj, Kwanyong Seo, Sunghun Lee, Yonghun Jo, Myung-Hwa Jung, Jinhee Kim, and Bongsoo Kim, “Single-Crystalline Ferromagnetic Fe1-xCoxSi Nanowires”, Journal of Physical Chemistry C, 2008, 112, 4748 (pdf file) (IF : 4.772)
4. Sunghun Lee, Wonjoo Lee, Kwanyong Seo, Jinhee Kim, Sung-Hwan Han, and Bongsoo Kim, “Electronic Transport Mechanism and Photocurrent Generations of Single Crystalline InN Nanowires”, Nanotechnology, 2008, 19, 415202 (pdf file) (IF : 3.821)
5. Kwanyong Seo, Sunghun Lee, Younghun Jo, Myung-Hwa Jung, Jinhee Kim, David G. Churchill, and Bongsoo Kim, “Room Temperature Ferromagnetism in Single-crystalline Fe5Si3 Nanowires”, Journal of Physical Chemistry C, 2009, 113, 6902 (pdf file) (IF : 4.772)
6. Kwanyong Seo, Sunghun Lee, Hana Yoon, Juneho In, Kumar S. K. Varadwaj, Younghun Jo, Myung-Hwa Jung, Jinhee Kim, and Bongsoo Kim, “Composition-Tuned ConSi Nanowires: Location-Selective Simultaneous Growth along Temperature Gradient”, ACS Nano, 2009, 3, 1145 (pdf file) (IF : 12.881)
7. Juneho In, Kwanyong Seo, Sunghun Lee, Hana Yoon, Jeunghee Park, Gangho Lee, and Bongsoo Kim, “Morphology-Tuned Synthesis of Single-Crystalline V5Si3 Nanotubes and Nanowires”, Journal of Physical Chemistry C, 2009, 113, 12996 (pdf file) (IF : 4.772)
8. Kwanyong Seo, Hana Yoon, Seong-Wan Ryu, Sunghun Lee, Younghun Jo, Myung-Hwa Jung, Jinhee Kim, Yang-Kyu Choi, and Bongsoo Kim, “Itinerant Helimagnetic Single-Crystalline MnSi Nanowires”, ACS Nano, 2010, 4, 2069 (pdf file) (IF : 12.881)
9. Sunghun Lee, Juneho In, Jung-Won Chang, Kwanyong Seo, Myung-Hwa Jung, Jinhee Kim, Bongsoo, Kim, “Magnetotransport Properties and Kondo Effect Observed in a Ferromagnetic Single-Crystalline Fe1-xCoxSi Nanowire”, Chemistry-An Asia Journal, 2012, 7, 406 (pdf file) (IF : 4.587)
10. Sunghun Lee, Hana Yoon, Ilsun Yoon, and Bongsoo Kim, “Single Crystalline NbO2 Nanowire Synthesis by Chemical Vaopr Transport Method”, Bulletin Korean Chemical Society, 2012, 33, 839 (pdf file) (IF : 0.797)
11. Sunghun Lee, Juneho In, Youngdong Yoo, Yonghun Jo, Yun Chang Park, Hyung-jun Kim, Hyun Cheol Koo, Jinhee Kim, Bongsoo Kim, and Kang, L. Wang, “Single Crystalline β-Ag2Te Nanowire as a New Topological Insulator”, Nano Letters, 2012, 12, 4194 (pdf file) (IF : 13.592)
12. Sunghun Lee, Juneho In, Si-in Kim, Yun Chang Park, Hyunju Kim, Hana Yoon, Jinhee Kim, Sungyul Lee, and Bongsoo Kim, “Atomistically Observing Real Space Structure of Single Crystalline (Nb0.94V0.06)10(SixGe1-x)7 Nanowires with Ultralow Resistivity”, Journal of Material Chemistry C, 2013, 1, 1674 (pdf file) (IF : 4.696)
13. Hana Yoon, Si-in Kim, Sunghun Lee, Juneho In, Jihwan Kim, Hyunseong Ryoo, Jae-Hong Noh, Jae Pyung Ahn, Younghun Jo, Jaebum Choo, and Bongsoo Kim, “Three-Dimensionally Kinked High-Conducting CoGe Nanowire Growth Induced by Rotational Twinning”, Journal of Material Chemistry C, 2013, 1, 6259 (pdf file) (IF : 4.696)
14. Myoung-Jae Lee, Dongsoo Lee, Seong-Ho Cho, Ji Hyun Hur, Sang-Moon Lee, BokKi Min, David H. Seo, Dong-Sik Kim, Moon-Seung Yang, Sunghun Lee, Euichul Hwang, Mohammad Rakib Uddin, U-In Chung, Youngsoo Park, and In-Kyeong Yoo, “A Plasma-Treated Chalcogenide Switch Device for Stackable Scalable 3D Nanoscale Memory”, Nature Communications, 2013, 4, 2629 (pdf file) (IF : 11.47)
15. Si-In Kim, Hana Yoon, Hyoban Lee, Sunghun Lee, Younghun Jo, Sungyul Lee, Jaebum Choo, and Bongsoo Kim, “Epitaxy-Driven Vertical Growth of Single-Crystalline Cobalt Nanowire Arrays by Chemical Vapor Deposition”, Journal of Material Chemistry C, 2015, 3, 100 (pdf file) (IF : 4.696)
16. Sang-Moon Lee, Young Jin Cho, Jong-Bong Park, Keun Wook Shin, Euichul Hwang, Sunghun Lee, Myoung-Jae Lee, Seong-Ho Cho, Dong Su Shin, Jinsub Park, and Euijoon Yoon, “Effects of Growth Temperature on Surface Morphology of InP Grown on Patterned Si(001) Substrates”, Journal of Crystal Growth, 2015, 416, 113 (pdf file) (IF : 1.698)
17. Jihwan Kim, Ahreum Hwang, Sang-Hoon Lee, Seung-Hoon Jhi, Sunghun Lee, Yun Chang Park, Si-in Kim, Hong-Seok Kim, Yong-Joo Doh, Jinhee Kim, and Bongsoo Kim, “Quantum Electronic Transport of Topological Surface States in β-Ag2Se Nanowire”, ACS Nano, 2016, 10, 3936. (IF : 12.881)
Domestic
1. Sunghun Lee, Kwanyong Seo, K. S. K. Varadwaj, Jinhee Kim, and Bongsoo Kim, “Fabrication of Nanodevice Using Single Crystalline CoSi Nanowire and Measurements for Transport Characteristics of CoSi Nanowires”, Spring Meeting of Korean Physical Society, Pyungchang, 2007, Apr. 19~20
2. Sunghun Lee, Jinhee Kim, and Bongsoo Kim, “Synthesis and Electrical Properties of Catalyst-free Single Crystalline Indium Nitride Nanowires”, Spring Meeting of Korean Physical Society, Pyungchang, 2007, Apr. 19~20
3. Juneho In, K. S. K. Varadwaj, Kwanyong Seo, Sunghun Lee, Yonghun Jo, Myung-Hwa Jung, Jinhee Kim, and Bongsoo Kim, “Single Crystalline Ferromagnetic Fe1-xCoxSi Nanowries”, Symposium at Chungnam association of Korean Chemical Society, KAIST, 2007, Sep. 29
4. Sunghun Lee, Wonjoo Lee, Kwanyong Seo, Jinhee Kim, Sung-Hwan Han, and Bongsoo Kim, “Electrical and Optoelectrical Properties of Single Crystalline InN Nanowires”, Fall Meeting of Korean Physical Society, Jeju Island, 2007, Oct. 18~19
5. Sunghun Lee, Wonjoo Lee, Kwanyong Seo, Jinhee Kim, Sung-Hwan Han, and Bongsoo Kim, “Electrical and Optoelectrical Properties of Single Crystalline InN Nanowires”, BK Symposium, KAIST, 2007, Dec. 17
6. Sunghun Lee, Wonjoo Lee, Kwanyong Seo, Jinhee Kim, Sung-Hwan Han, and Bongsoo Kim, “Electrical and Optoelectrical Properties of Single Crystalline InN Nanowires”, 9th Nanowire Research Society, Ilsan KINTAX, 2008, Aug. 29
7. Sunghun Lee, Juneho In, Jinhee Kim, and Bongsoo Kim, “Spin-down Electron Dominant Transport and Anisotropy Magnetoresistance in Fe1-xCoxSi nanowiress”, 10th Nanowire Research Society, Seoul National University, 2009, Feb. 10
8. Sunghun Lee, Juneho In, Jinhee Kim, and Bongsoo Kim, “Spin-down Electron Dominant Transport and Anisotropy Magnetoresistance in Fe1-xCoxSi nanowiress”, Spring Meeting of Korean Physical Society, Daejeon DCC, 2009, Apr. 23~24
9. Sunghun Lee, Juneho In, Jung-Won Chang, Myung-Hwa Jung, Jinhee Kim, and Bongsoo Kim, “Semi-Metallic Kondo Lattice Observed in a Single-Crystalline Fe1-xCoxSi nanowire”, Fall Meeting of Korean Physical Society, Changwon CECO, 2009, Oct. 21~23
10. Kwanyong Seo, Hana Yoon, Sunghun Lee, and Bongsoo Kim, “Synthesis and Characterization of Manganese Silicide Nanowires”, Fall Meeting of Korean Chemical Society, Daejeon DCC, 2009, Oct. 28~30
11. Sunghun Lee, Juneho In, Jung-Won Jang, Kwanyong Seo, Myung-Hwa Jung, Jinhee Kim, and Bongsoo Kim, “Negative Anisotropic Magnetoresistance and Kondo Effect in a Ferromagnetic Single-Crystalline Fe1-xCoxSi Nanowire”, The 12th Nanowire Research Society, Ilsan KINTAX, 2010, Aug. 20
12. Sunghun Lee, Juneho In, Yun Chang Park, Jinhee Kim, Bongsoo Kim, “Magnetotransport Properties and Shubnikov-de Haas Oscillation induced from Bi-rich Bi2Te3 Nanoribbons with High Carrier Mobility”, Spring Meeting of Korean Physical Society, Daejeon DCC, 2011, Apr. 13~15
13. Sunghun Lee, Juneho In, Jung-Won Jang, Kwanyong Seo, Myung-Hwa Jung, Jinhee Kim, and Bongsoo Kim, “Negative Anisotropic Magnetoresistance and Kondo Effect in a Ferromagnetic Single-Crystalline Fe1-xCoxSi Nanowire”, Fall Meeting of Korean Chemical Society, Jeju ICC, 2011, Apr. 28~29
14. Hyunju Kim, Juneho In, Sunghun Lee, Bongsoo Kim, “Synthesis and Characterization of Binary to Quaternary Nb-based Compound Nanowires”, Fall Meeting of Korean Chemical Society, Jeju ICC, 2011, Apr. 28~29
15. Hyunju Kim, Juneho In, Sunghun Lee, Bongsoo Kim, “Synthesis of Iron-based Chalcogenide Nanostructures as a Candidate Material for Superconductor”, Fall Meeting of Korean Chemical Society, Jeju ICC, 2011, Apr. 28~29
16. Sunghun Lee, Juneho In, Yun Chang Park, Hyun-Cheol Koo, Jinhee Kim, Bongsoo Kim, “New Topological Insulator Candidate: Single Crystalline Ag2Te Nanowires and Nanoplates”, Spring Meeting of Korean Physical Society, Daejeon DCC, 2012, Apr. 25~27
10. Sang-Moon Lee, Myoung-Jae Lee, Young Jin Cho, Jong -Bong Park, Sunghun Lee, Moon-Seung Yang, Dongsoo Lee, Euichul Hwang, Ji-Hyun Hur, David. H. Seo, Seongho Cho, Young Soo Park, “Selective Area Growth oj High Quality III-V Materials on Si (001) by MOCVD”, Material Research Society 2013 Fall Meeting, Boston, U.S.A., 2013, Dec. 1~6
11. Ji-Hhyun Hur, Sang-Moon Lee, Dongsoo Lee, Euichul Hwang, Youngjin Cho, Moon-Seung Yang, Sunghun Lee, Mohammad Rakib Uddin, Myoung-Jae Lee, Seongho Cho, Young Soo Park, “Modelling for III-V MOSFET Degradation/Failure by Dislocations and Interface Defects”, Gettering and Defect Engineering in Semiconductor Technology 2013, University of Oxford, UK, 2013, Sep. 22~27
HONORS & AWARDS
1. Golden presentation Award, KAIST-NTHU Junior Chemists Workshop, KAIST, 2008, Jan. 30~Feb. 1
2. Gold Presentation Award, Asian Nanotech Camp 2011, Ilsan KINTAX, 2011, Aug. 15~28
3. Gold Prize Winner, 18th Samsung Human Tech Thesis Award, Seoul Samsung Electronics Building, 2012, Feb. 17
4. Best Presentation Award, 88th Spring Meeting of the Korean Physical Society, Daejeon Convention Center, 2012, Apr. 25~27
PRESENTATIONS
International
1. K. S. K, Varadwaj, Kwanyong Seo, Juneho In, Sunghun Lee, and Bongsoo Kim, “Silica Coated Freestanding Fe5Si3 Nanowires with Room Temperature Ferromagnetism”, ESF-EMBO Biomagnetism and Magnetic Biosystems Based on Molecular Recognition Process, Spain, 2007, Sep. 22~27
2. Juneho In, K. S. K. Varadwaj, Kwanyong Seo, Sunghun Lee, Yonghun Jo, Myung-Hwa Jung, Jinhee Kim, and Bongsoo Kim, “Single Crystalline Ferromagnetic Fe1-xCoxSi Nanowires”, The 10th Eurasia Conference on Chemical Sciences, Philippines, 2008, Jan. 7~11
3. Sunghun Lee, Wonjoo Lee, Kwanyong Seo, Jinhee Kim, Sung-Hwan Han, and Bongsoo Kim, “Electrical and Optoelectrical Properties of Single Crystalline InN Nanowires”, KAIST-NTHU Junior Chemists Workshop, KAIST, 2008, Jan. 30~Feb., 1
4. Juneho In, K. S. K. Varadwaj, Kwanyong Seo, Sunghun Lee, Hana Yoon, Yonghun Jo, Myung-Hwa Jung, Jinhee Kim, and Bongsoo Kim, “Single Crystalline Ferromagnetic Fe1-xCoxSi Nanowires”, CMRS Meeting, Chongqing, China, 2008, Jun. 9~12
5. Bongsoo Kim, Kwanyong Seo, Hana Yoon, Sunghun Lee, Seong-Wan Ryu, Younghun Jo, Myung-Hwa Jung, Jinhee Kim, Yang-Kyu Choi, “Unusual Ferromagnetic Properties of Single Crystalline CoSi, MnSi, and FeGe Nanowires”, The International Chemical Congress of Pacific Basin Societies, Hawaii, USA, 2010, Dec. 15~20
6. Sunghun Lee, Juneho In, Yun-Chang Park, Jinhee Kim, Bongsoo Kim, “Magnetotransport Properties of Single Crystalline Fe1-xCoxSi and Ag2Te Nanowires”, Asian Nanotech Camp 2011, Ilsan KINTAX, Korea, 2011, Aug. 15~28
7. Hyoban Lee, Hyunju Kim, Juneho In, Yun Chang Park, Sunghun Lee, Hana Yoon, Si-in Kim, Jinhee Kim, Bongsoo Kim, “Observation of Fine Composition Modulation in Single-Crystalline (Nb0.94V0.06)10(SixGe1-x)7 Nanowires by STEM Simulation”, IEEE Nanotechnology Materials and Devices Conference, Jeju Island, Korea, 2011, Oct. 18~21
8. Sunghun Lee, Juneho In, Hyun Cheol Koo, Jinhee Kim, Bongsoo Kim, “New Topological Insulator Candidate: Single Crystalline Ag2Te Nanowires and Nanoplates”, Material Research Society 2012 spring meeting, San Francisco Moscone Center, U.S.A., 2012, Apr. 9~13
9. Sunghun Lee, Juneho In, Jinhee Kim, Bongsoo Kim, “Magnetotransport Properties and Kondo Effect Observed in a Ferromagnetic Single Crystalline Fe1-xCoxSi Nanowire”, Material Research Society 2012 spring meeting, San Francisco Moscone Center, U.S.A., 2012, Apr. 9~13