Personal profile
In Korean
Education
o (2012) B.S. Sungkyunkwan University (SKKU), Korea
o (2015) Ph.D. Daegu Gyeongbuk Institute of Science & Technology (DGIST), Korea
Professional Experience
o (2024~Present) Assistant Professor, Kyungpook National University (KNU), Korea
o (2021~2024) Postdoctoral researcher, ICFO-The Institute of Photonic Sciences, Spain
o (2019~2021) Postdoctoral researcher, Korea Institute of Science and Technology (KIST), Korea
Research Interests
Low dimensional material based-2D Electronic Device, Hybrid Photodetector (Optoelectronics), Cutting-Edge Semiconductor Fabrication and Photonics, Optical Neuromorphic Device
Major Research Achievements
o Probing optical multi-level memory effects in single core-shell quantum dots and application through 2D-0D hybrid inverters
o Advances in Heterostructures for Optoelectronic Devices: Materials, Properties, Conduction Mechanisms, Device Applications
o Fermi-level pinning-free WSe2 transistors via 2D van der Waals metal contacts and their complementary logic gate circuits
o Probing the importance of Charge Balance and Noise Current in WSe2/WS2/MoS2 van der Waals Heterojunction Phototransistors by selective electrostatic doping
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Collaborations and top research areas from the last five years
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High-Gain Ag2Te/MoS2 Hybrid Photodetectors for Short-Wave Infrared Imaging
Jeong, S. J., Ko, H. W., Jo, S., Selvaraj, J., Kim, J. M., Lee, N., Ahn, J. H., Lee, H., Jeong, S., Kim, H., Seo, P. H., Shim, J. W., Kim, Y., Ra, H. S., Park, M. C. & Lee, J. S., 17 Apr 2026, In: Advanced Materials. 38, 22, e20984.Research output: Contribution to journal › Article › peer-review
Open Access -
Advances in Heterostructures for Optoelectronic Devices: Materials, Properties, Conduction Mechanisms, Device Applications
Ra, H. S., Lee, S. H., Jeong, S. J., Cho, S. & Lee, J. S., 20 Feb 2024, In: Small Methods. 8, 2, 2300245.Research output: Contribution to journal › Review article › peer-review
37 Scopus citations -
Probing Optical Multi-Level Memory Effects in Single Core-Shell Quantum Dots and Application Through 2D–0D Hybrid Inverters
Ra, H. S., Kim, T. W., Taylor, D. A., Lee, J. J., Song, S., Ahn, J., Jang, J., Taniguchi, T., Watanabe, K., Shim, J. W., Lee, J. S. & Hwang, D. K., 27 Sep 2023, In: Advanced Materials. 35, 39, 2303664.Research output: Contribution to journal › Article › peer-review
Open Access11 Scopus citations -
An Asymmetry Field-Effect Phototransistor for Solving Large Exciton Binding Energy of 2D TMDCs
Ra, H. S., Ahn, J., Jang, J., Kim, T. W., Song, S. H., Jeong, M. H., Lee, S. H., Yoon, T., Yoon, T. W., Kim, S., Taniguch, T., Watanabe, K., Song, Y. J., Lee, J. S. & Hwang, D. K., 17 Feb 2022, In: Advanced Materials. 34, 7, 2107468.Research output: Contribution to journal › Article › peer-review
12 Scopus citations -
Fermi-Level Pinning-Free WSe2 Transistors via 2D Van der Waals Metal Contacts and Their Circuits
Jang, J., Ra, H. S., Ahn, J., Kim, T. W., Song, S. H., Park, S., Taniguch, T., Watanabe, K., Lee, K. & Hwang, D. K., 12 May 2022, In: Advanced Materials. 34, 19, 2109899.Research output: Contribution to journal › Article › peer-review
Open Access126 Scopus citations