Embedded Files
Background
Background
The optical properties of 2D semiconductors are strongly influenced by excitons and their interactions with the surrounding environment. Changes in carrier populations, defects and interlayer coupling can modify how these excitations form, transfer and emit light.
Strain engineering provides a means of tuning electronic structure and interlayer interactions through mechanical deformation. Ferroelectric polarization offers complementary electrical control of excitonic emission. Together, these approaches create opportunities for tunable light-emitting structures, optical memory and other optoelectronic device concepts.
Our Research
Our Research
Our research investigates how strain, pressure and ferroelectric polarization control optical responses in 2D semiconductors and van der Waals heterostructures. We study the relationships between interlayer coupling, charge and energy transfer, and excitonic emission. By combining heterostructure fabrication with Raman and photoluminescence spectroscopy, we connect material and interface changes with optical behavior and explore approaches to spatially controlled and electrically reconfigurable emission.
Our Research
Our Research
Exciton research connects semiconductor materials with photonics, optical sensing, and emerging quantum technologies. Optical spectroscopy, instrumentation, and quantitative analysis support the translation of fundamental light–matter interactions into device concepts, while also serving broader needs in semiconductor characterization and optical metrology.
Publications
Publications
Joon-Seok Kim, Sarah Carin Gavin, Nathaniel P. Stern, Lincoln J. Lauhon#, “Non-Volatile Modulation of Light Emission from Delocalized and Defect-Bound Excitons in Monolayer MoS2 Using the Remnant Polarization in the Ferroelectric Polymer P(VDF-TrFE): Implications for Optical Memory” ACS Applied Nano Materials, 6, 19, 17349 (2023)
Joon-Seok Kim, Nikhilesh Maity, Myungsoo Kim, Suyu Fu, Rinkle Juneja, Abhishek K. Singh, Deji Akinwande, and Jung-Fu Lin, "Strain-Modulated Interlayer Charge and Energy Transfers in MoS2/WS2 Heterobilayer", ACS Applied Materials & Interfaces, 14, 46841 (2022)
Joon-Seok Kim, Rinkle Juneja, Nilesh P. Salke, Witold Palosz, Venkataraman Swaminathan, Sudhir Trivedi, Abhishek K. Singh, Deji Akinwande, and Jung-Fu Lin, "Structural, Vibrational, and Electronic Topological Transitions of Bi1.5Sb0.5Te1.8Se1.2 under Pressure", Journal of Applied Physics, 123, 115903 (2018)
Joon-Seok Kim, Rafia Ahmad, Tribhuwan Pandey, Amritesh Rai, Simin Feng, Jing Yang, Zhong Lin, Mauricio Terrones, Sanjay K. Banerjee, Abhishek K. Singh, Deji Akinwande, Jung-Fu Lin, "Towards Band Structure and Band Offset Engineering of Monolayer Mo(1−x)W(x)S2 via Strain", 2D Materials, 5, 1 (2017)
Page updated
Google Sites
Report abuse