Department of Semiconductor and Electronic Engineering · Daegu University
Our group builds light-emitting and light-sensing devices from semiconductors only a few atoms thick — suspending monolayers over nanostructured templates, stacking them into tunnel diodes, and reading out what happens with confocal and near-field spectroscopy that we design ourselves.
Citation total from the Google Scholar profile, checked August 2026. Scholar publishes no API, so this figure is refreshed by hand. The paper count is taken from the list below.
Five directions, ordered the way a spectrometer would order them — by the wavelength of the light each one lives at.
A monolayer touching a substrate is never really free: the substrate strains it, dopes it, and quenches its emission. We lift transition metal dichalcogenides off the surface entirely, suspending them across nanostructured templates in a single lay-on step. The resulting membranes show photoresponsivity orders of magnitude above their supported counterparts.
Excitons carry energy without carrying net charge, which makes them attractive and awkward in equal measure — they are neutral, so they are hard to steer. We study how to gate, confine and switch them, including dark excitons that normally refuse to emit at all until a plasmonic field persuades them otherwise.
Stacking a monolayer semiconductor on hexagonal boron nitride on gallium nitride gives a tunnel diode with no lattice-matching requirement and no epitaxy. We build metal–insulator–semiconductor and semiconductor–insulator–semiconductor devices this way, and ask what the interfaces — not the layers — are actually doing.
Why does an InGaN LED lose efficiency exactly when you drive it hard? We map carrier localisation inside the quantum wells directly, then redistribute it — with V-pits, ZnO nanorod arrays, periodic hole patterns and graphene-oxide passivation — to pull more light out of the same active region.
Some measurements do not exist until you build the instrument that makes them. The lab develops confocal electroluminescence microscopes, UV confocal systems and time-resolved near-field probes — which is also why our device work and our spectroscopy work are never really separate projects.
Funded projects
The group is new and growing. There is room for you in it.
images/portraitPrincipal Investigator · Assistant Professor
Hyun Jeong leads the 2D Optoelectronics Laboratory and directs the Semiconductor Bootcamp Center at Daegu University. He has spent his career at the point where device fabrication meets optical measurement: first on GaN light emitters at Jeonbuk National University, then on two-dimensional materials at IBS-CINAP, at the Université de Technologie de Troyes in France, and at Hanyang University, with four years in between developing OLED lighting at LG Display.
His work on integrated freestanding transition metal dichalcogenides appeared on the front cover of Advanced Materials and became the basis for the group's current programme on suspended-membrane photodetectors and exciton devices.
Research interests Semiconductors · Optoelectronics · Two-dimensional materials · Spectroscopy · Light-emitting diodes
Group members
We are recruiting graduate students and undergraduate interns interested in two-dimensional semiconductors, optical spectroscopy, or device fabrication. Cleanroom experience is welcome but not expected — most of what we do is learned at the bench. Email the PI with a short note about what you want to work on.
Write to us62 peer-reviewed papers, 23 as first author. Five that best describe what the lab does — the complete list follows below.
Advanced Materials · 29(18), 1700308 · 2017 Front cover
H. Jeong, H. M. Oh, A. Gokarna, H. Kim, S. J. Yun, G. H. Han, M. S. Jeong, Y. H. Lee, G. Lerondel
ACS Nano · 9(10), 10032–10038 · 2015
H. Jeong, S. Bang, H. M. Oh, H. J. Jeong, S.-J. An, G. H. Han, H. Kim, K. K. Kim, J. C. Park, Y. H. Lee, G. Lerondel, M. S. Jeong
Nano Letters · 16(3), 1858–1862 · 2016
H. Jeong, H. M. Oh, S. Bang, H. J. Jeong, S.-J. An, G. H. Han, H. Kim, S. J. Yun, K. K. Kim, J. C. Park, Y. H. Lee, G. Lerondel, M. S. Jeong
ACS Nano · 18(5), 4432–4442 · 2024
H. Jeong, K. Nomenyo, H. M. Oh, A. Gwiazda, S. J. Yun, C. Chevalier César, S. W.-N. Bayor, M. S. Jeong, Y. H. Lee, G. Lérondel
Advanced Science · 12(3), 2411841 · 2025
H. Jeong, H. C. Suh, G. H. Cho, H. Joo, Y. Koo, H. Ko, K. K. Kim, Y. Kim, J. Kim, K.-D. Park, M. S. Jeong
Citation counts and percentiles are fetched live from OpenAlex whenever the page loads. Impact factor and journal rank are Clarivate JCR 2024 figures — JCR is licensed data with no open API, so those two are edited by hand once a year.
All publications
62 peer-reviewed papers, newest first. The five marked Featured are the ones shown above.
Hyun Jeong presents "Architectural and Interfacial Engineering of Two-Dimensional Semiconductors for Next-Generation Electronics and Optoelectronics."
"Engineering Two-Dimensional Materials for High-Performance Optoelectronic Applications," Taoyuan, Taiwan.
A lignin-induced route to high-performance p-type tellurium field-effect transistors.
A four-year programme to build an exciton transistor from two-dimensional semiconductors. Department announcement ↗
Hyun Jeong joins the Department of Semiconductor and Electronic Engineering and takes on direction of the Semiconductor Bootcamp Center.
Plasmon coupling makes normally non-radiative dark excitons emit brightly over large areas at room temperature.
In the press
The department announces the group’s selection for the National Research Foundation’s Excellent Young Researcher Program.
Daegu University is selected for the national semiconductor Boot Camp programme, funded at roughly ₩1.5 bn a year for five years. The PI now directs the resulting centre.
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Department of Semiconductor
and Electronic Engineering
Daegu University
201 Daegudae-ro, Gyeongsan-si
Gyeongsangbuk-do 38453
Republic of Korea