Publications de Cheol Yeon Cheon

Electrical spectroscopy of defect states and their hybridization in monolayer MoS2

Andras Kis, Oleg Yazyev, Mukesh Kumar Tripathi, Yanfei Zhao, Ahmet Avsar, Kristians Cernevics, Zhenyu Wang, Juan Francisco Gonzalez Marin, Cheol Yeon Cheon, Hyungoo Ji

Defects in solids are unavoidable and can create complex electronic states that can significantly influence the electrical and optical properties of semiconductors. With the rapid progress in the integration of 2D semiconductors in practical devices, it is ...

Nature Research2023

Disorder-induced bulk photovoltaic effect in a centrosymmetric van der Waals material

Andras Kis, Mukesh Kumar Tripathi, Zhe Sun, Juan Francisco Gonzalez Marin, Cheol Yeon Cheon

Sunlight is widely seen as one of the most abundant forms of renewable energy, with photovoltaic cells based on pn junctions being the most commonly used platform attempting to harness it. Unlike in conventional photovoltaic cells, the bulk photovoltaic ef ...

2023

Engineering Optically Active Defects in Hexagonal Boron Nitride Using Focused Ion Beam and Water

Aleksandra Radenovic, Andras Kis, Georg Fantner, Evgenii Glushkov, Nathan Cyprien Arsène Ronceray, Ahmet Avsar, Vytautas Navikas, Michal Daniel Macha, Cheol Yeon Cheon, Aqeel Ahmed

Hexagonal boron nitride (hBN) has emerged as a promising material platform for nanophotonics and quantum sensing, hosting optically active defects with exceptional properties such as high brightness and large spectral tuning. However, precise control over ...

AMER CHEMICAL SOC2022

Room-temperature electrical control of polarization and emission angle in a cavity-integrated 2D pulsed LED

Andras Kis, Fedele Tagarelli, Dmitrii Unuchek, Zhe Sun, Juan Francisco Gonzalez Marin, Cheol Yeon Cheon

Devices based on two-dimensional (2D) semiconductors hold promise for the realization of compact and versatile on-chip interconnects between electrical and optical signals. Although light emitting diodes (LEDs) are fundamental building blocks for integrate ...

Nature Research2022

Disorder-induced electronic, magnetic, and optoelectronic properties of two-dimensional materials

Cheol Yeon Cheon

Technological advancement has been in cadence with material development by improving the purity of single crystals and, at the same time, controlling their imperfections. These capabilities have been especially vital for developing new technolo-gies based ...

EPFL2022

Superconducting 2D NbS2 Grown Epitaxially by Chemical Vapor Deposition

Aleksandra Radenovic, Andras Kis, Mukesh Kumar Tripathi, Michal Daniel Macha, Yanfei Zhao, Guilherme Migliato Marega, Zhenyu Wang, Cheol Yeon Cheon, Hyungoo Ji

Metallic two-dimensional (2D) transition metal dichalcogenides (TMDCs) are attracting great attention because of their interesting low-temperature properties such as superconductivity, magnetism, and charge density waves (CDW). However, further studies and ...

2021

Probing magnetism in atomically thin semiconducting PtSe2

Andras Kis, Oleg Yazyev, Mukesh Kumar Tripathi, Ahmet Avsar, Michele Pizzochero, Alberto Ciarrocchi, Cheol Yeon Cheon

Atomic-scale disorder in two-dimensional transition metal dichalcogenides is often accompanied by local magnetic moments, which can conceivably induce long-range magnetic ordering into intrinsically non-magnetic materials. Here, we demonstrate the signatur ...

Nature Research2020