Article
Chemistry, Multidisciplinary
Junho Choi, Jacob Embley, Daria D. Blach, Raul Perea-Causin, Daniel Erkensten, Dong Seob Kim, Long Yuan, Woo Young Yoon, Takashi Taniguchi, Kenji Watanabe, Keiji Ueno, Emanuel Tutuc, Samuel Brem, Ermin Malic, Xiaoqin Li, Libai Huang
Summary: Transition metal dichalcogenide heterostructures serve as a versatile platform to explore electronic and excitonic phases. In this study, the spatial-temporal dynamics of interlayer excitons and hot-plasma phase in a MoSe2/WSe2 twisted bilayer are investigated using pump-probe microscopy. The rapid expansion of the hot plasma driven by Fermi pressure and Coulomb repulsion is observed.
Article
Chemistry, Physical
Juchan Lee, Ngoc Thanh Duong, Dae Young Park, Chul Ho Park, Byeong Geun Jeong, Mun Seok Jeong
Summary: This study fabricated a van der Waals homojunction p-n diode with elementally doped WSe2, achieving ideal forward current transport characteristics and changing the carrier transport mechanism from diffusion to tunneling under doping. The device exhibited a high rectification ratio of 2 x 10(5) at 300 K, providing a comprehensive understanding of carrier transport mechanisms in high-performance backward van der Waals homojunction diodes.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Yue Wang, Haoran Sun, Zhe Sheng, Jianguo Dong, Wennan Hu, Dongsheng Tang, Zengxing Zhang
Summary: This paper introduces a top-gated field-effect transistor (FET) design based on ambipolar 2D WSe2, which achieves efficient ambipolar charge injection and provides a new approach for the design of reconfigurable photodiodes. By controlling the switch states of the two semi-gates, the devices can switch between PIN and NIP configurations, exhibiting good linearity.
Article
Nanoscience & Nanotechnology
B. J. Ye, Y. S. Liu, F. Xie, X. F. Yang, Y. Gu, X. M. Zhang, W. Y. Qian, C. Zhu, N. Y. Lu, G. Q. Chen, G. F. Yang
Summary: In this study, a WSe2/GaN heterojunction photodetector was fabricated by transferring layered tungsten selenide onto a gallium nitride substrate using a mechanical exfoliation method. The device exhibited good rectifying behavior and dual-wavelength photoresponse. Density functional theory calculations confirmed the type I energy band alignment of the heterojunction.
MATERIALS TODAY NANO
(2023)
Article
Materials Science, Multidisciplinary
Pengzhi Wang, Yongsheng Wang, Ang Bian, Shengcai Hao, Qing Miao, Xiaoxian Zhang, Jiaqi He, Dawei He, Hui Zhao
Summary: In this study, energy transfer in a van der Waals heterostructure formed by WSe2 and PtSe2 monolayers was investigated using steady-state photoluminescence and time-resolved transient absorption spectroscopy. The results showed that excitation can be transferred from WSe2 to PtSe2, but not vice versa. These findings reveal the band alignment of WSe2 and PtSe2 monolayers.
Article
Chemistry, Multidisciplinary
Kei Takeyama, Rai Moriya, Shota Okazaki, Yijin Zhang, Satoru Masubuchi, Kenji Watanabe, Takashi Taniguchi, Takao Sasagawa, Tomoki Machida
Summary: Few-layer transition metal dichalcogenides exhibit subband quantization and can be utilized for infrared optoelectronics applications.
Article
Chemistry, Multidisciplinary
Kohei Sakanashi, Peter Kruger, Kenji Watanabe, Takashi Taniguchi, Gil-Ho Kim, David K. Ferry, Jonathan P. Bird, Nobuyuki Aoki
Summary: In this study, a quantum point contact structure was achieved in a p-type trilayer tungsten diselenide-based van der Waals heterostructure using a modified van der Waals contact method. Clear quantized conductance and pinch-off states were observed through dual-gating control, indicating the presence of intrinsic spin-polarized quantum point contact features. Conductance plateaus and quarter plateaus were observed at specific bias voltage conditions.
Article
Multidisciplinary Sciences
Long Zhang, Fengcheng Wu, Shaocong Hou, Zhe Zhang, Yu-Hsun Chou, Kenji Watanabe, Takashi Taniguchi, Stephen R. Forrest, Hui Deng
Summary: Controlling matter-light interactions with cavities is crucial in modern science and technology. By integrating MoSe2-WS2 heterobilayers in a microcavity, cooperative coupling between moire-lattice excitons and microcavity photons has been established, providing versatile control of both matter and light. This moire polariton system combines strong nonlinearity and microscopic-scale tuning of matter excitations, offering a platform to study collective phenomena from tunable arrays of quantum emitters.
Article
Chemistry, Multidisciplinary
Peng Luo, Fakun Wang, Jingyu Qu, Kailang Liu, Xiaozong Hu, Kewei Liu, Tianyou Zhai
Summary: This study reports a WSe2/Bi2O2Se Van der Waals p-n heterostructure with superior performance in photodetection, showing promising potentials for high-performance self-driven photodetector applications.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Chaoyang Tan, Shiqi Yin, Jiawang Chen, Yuan Lu, Wensen Wei, Haifeng Du, Kailang Liu, Fakun Wang, Tianyou Zhai, Liang Li
Summary: This paper reports a broken-gap vdW heterojunction PtS2/WSe2 with bilateral accumulation region design and a large band offset, showing ultra-high rectification ratio and on/off ratio, as well as excellent photodetection properties.
Article
Chemistry, Multidisciplinary
Changxiu Li, Alexey V. V. Scherbakov, Pedro Soubelet, Anton K. K. Samusev, Claudia Ruppert, Nilanthy Balakrishnan, Vitalyi E. E. Gusev, Andreas V. V. Stier, Jonathan J. J. Finley, Manfred Bayer, Andrey V. V. Akimov
Summary: The development of new techniques for ultrafast control of physical properties in 2D van der Waals nanolayers is necessary due to the increasing role of 2D devices. Heterobilayers assembled from van der Waals monolayers have the special feature of femtosecond separation of photoexcited electrons and holes between neighboring layers, resulting in the formation of Coulomb force. Coherent phonons generated in MoSe2/WSe2 heterobilayers through laser pulses can modulate the thickness of the heterobilayer and the photogenerated electric field in the van der Waals gap. Additionally, the modulation of the van der Waals gap by coherent phonons enables the generation of THz radiation in 2D nanodevices with van der Waals heterobilayers.
Article
Chemistry, Multidisciplinary
Jingfeng Li, Mahdi Ghorbani-Asl, Kinga Lasek, Vimukthi Pathirage, Arkady V. Krasheninnikov, Matthias Batzill
Summary: By locally modulating the interlayer atom coordination in the van der Waals heterostructure of PtSe2/PtTe2, a nanoscale electronic structure texture can be introduced in PtSe2. The interaction between PtSe2 and PtTe2 reduces the band gap of PtSe2. Density functional theory calculations indicate that variations in atom coordination in the moire unit cell cause differences in charge transfer and interface dipole.
Article
Chemistry, Multidisciplinary
Kei Kinoshita, Rai Moriya, Shota Okazaki, Yijin Zhang, Satoru Masubuchi, Kenji Watanabe, Takashi Taniguchi, Takao Sasagawa, Tomoki Machida
Summary: This study demonstrates van der Waals double quantum well (vDQW) devices based on few-layer WSe2 quantum wells and a few-layer h-BN tunnel barrier. Superior current peak-to-valley ratios were obtained for the vDQWs compared to single quantum well (QW) devices. This finding provides a new direction for utilizing few-layer-thick transition metal dichalcogenides in subband QW devices.
Article
Chemistry, Multidisciplinary
Haonan Ling, Jacob B. Khurgin, Artur R. Davoyan
Summary: Layered van der Waals materials provide unique atomic-void channels with subnanometer dimensions, offering opportunities for advanced applications such as sensing and quantum information. Theoretical limits of light guiding in these channels show that materials with strong resonances, excitonic and polaritonic properties are ideal for deeply subwavelength light guiding. Transition metal dichalcogenides with excitonic properties can concentrate over 70% of optical power within them.
Article
Chemistry, Analytical
Jianwei Gao, Chunhua Wang, Yujin Chu, Yingkuan Han, Yakun Gao, Yanhao Wang, Chao Wang, Hong Liu, Lin Han, Yu Zhang
Summary: A biosensor based on graphene oxide-graphene van der Waals heterostructure has been developed for rapid and accurate detection of SARS-CoV-2 proteins. The biosensor shows strong selectivity and high sensitivity, outperforming traditional biosensors.
Article
Chemistry, Physical
Jisu Kim, Youn-Ji Heo, Jin-Yong Hong, Sung-Kon Kim
Article
Multidisciplinary Sciences
Itai Epstein, David Alcaraz, Zhiqin Huang, Varun-Varma Pusapati, Jean-Paul Hugonin, Avinash Kumar, Xander M. Deputy, Tymofiy Khodkov, Tatiana G. Rappoport, Jin-Yong Hong, Nuno M. R. Peres, Jing Kong, David R. Smith, Frank H. L. Koppens
Article
Nanoscience & Nanotechnology
Irati Alonso Calafell, Lee A. Rozema, David Alcaraz Iranzo, Alessandro Trenti, Philipp K. Jenke, Joel D. Cox, Avinash Kumar, Hlib Bieliaiev, Sebastien Nanot, Cheng Peng, Dmitri K. Efetov, Jin-Yong Hong, Jing Kong, Dirk R. Englund, F. Javier Garcia de Abajo, Frank H. L. Koppens, Philip Walther
Summary: Graphene-insulator-metal heterostructures exhibit significantly enhanced optical nonlinearity, offering potential for optically controlled and electrically tunable nano-optoelectronic devices.
NATURE NANOTECHNOLOGY
(2021)
Review
Polymer Science
Yeon-Ju Kwon, Jung-Bin Park, Young-Pyo Jeon, Jin-Yong Hong, Ho-Seok Park, Jea-Uk Lee
Summary: With the development of electronic devices, carbon-based thermal conductive polymer composites have become an important technology for thermal management of next-generation electronic devices. Researchers have explored ways to improve thermal conductivity by designing a three-dimensional network structure, suppressing the electrical conductivity of carbon fillers, vertically aligning carbon fillers, and enhancing the durability of the composite materials.
Article
Chemistry, Physical
Gyo Eun Gu, Joonwon Bae, Ho Seok Park, Jin-Yong Hong
Summary: A polymer-based nanofiber membrane with high specific surface area, porosity, and adsorption sites has been developed for selective trapping of radionuclides. Incorporating PB nanoparticles into the polymer matrix enhances binding affinity and selectivity to radionuclide targets, resulting in significantly higher adsorption capacity and removal efficiency compared to bulk PB. The adsorption kinetics show a homogeneous surface for adsorption, with all sites having equal adsorption energies for efficient ion-exchange between cyano groups of PB nanoparticles and radionuclides.
Article
Engineering, Manufacturing
Yeon Ju Kwon, Youn Kim, Young-Pyo Jeon, Jin-Yong Hong, Ho Seok Park, Jea Uk Lee
Summary: The development of miniaturized and highly integrated microelectronic products has highlighted the need for heat-dissipation materials with high thermal conductivity and electrical insulation. In this study, a hybrid powder Al@EEG was synthesized using planetary ball milling, providing thermal conductivity and electrical insulation to polymer composites for thermal management of electronics.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Polymer Science
Jea Uk Lee, Jin-Yong Hong
Summary: The surface modification of recycled plastic film-based aggregates was investigated using various methods to improve compatibility with cement paste. The acrylic binder coating method was found to be the most effective in increasing wettability and long-term stability of the aggregates.
Article
Chemistry, Multidisciplinary
Youn Kim, Ji Soo Hong, Su Young Moon, Jin-Yong Hong, Jea Uk Lee
Summary: This study evaluated the dispersibility and dispersion stability of carbon nanotubes (CNTs) in aqueous solution using three different dispersing agents. The results showed that CNT dispersion with polyvinyl pyrrolidone (PVP) had superior dispersibility and dispersion stability, as evidenced by viscosity and particle size analyses. Lumisizer analyses further confirmed the excellent dispersion stability of CNT dispersion with PVP compared to dispersion with sodium deoxycholate (DOC) and sodium dodecylbenzene sulfonate (NaDDBS) dispersing agents.
Article
Chemistry, Multidisciplinary
Joonwon Bae, Jin-Yong Hong
Summary: Nitrogen-doped porous carbon nanofibers (N-PCNF) were synthesized using carbonization method and demonstrated effective removal of heavy metal ions. The N-PCNF exhibited high removal efficiency for Hg2+ ions, showing potential for practical applications in heavy metal ion removal.
Article
Biochemistry & Molecular Biology
Joonwon Bae, Gyo Eun Gu, Yeon Ju Kwon, Jea Uk Lee, Jin-Yong Hong
Summary: As the importance of controlling radioactive materials increases, the development of functional materials for decontamination is becoming crucial. In this study, a three-dimensional porous carbon monolith functionalized with Prussian blue particles was prepared by removing colloidal silica particles from exfoliated graphene/silica composite precursors. The material showed a unique surface and pore structure and was effective in adsorbing hazardous radioactive substances. Various characterizations confirmed the successful incorporation of PB nanoparticles. Adsorption tests demonstrated that the functionalized porous carbon monolith had a higher adsorption capacity compared to the pristine porous carbon monolith and bulk PB for various radioactive ions. This material has potential applications in decontamination.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Polymer Science
Youn Kim, Jin-Yong Hong, Young-Pyo Jeon, Jung Bin Park, Cheol Jin Lee, Jea Uk Lee
Summary: Textile electronics are advantageous for novel electronic devices due to their flexibility, light weight, and wearability. This study presents wearable organic field-effect transistors (OFETs) with all-graphene electrodes fabricated using hot pressing. The fabricated devices exhibit stable electrical performance and high field-effect mobility.
Proceedings Paper
Engineering, Electrical & Electronic
Alessandro Trenti, Irati Alonso Calafell, Lee A. Rozema, David Alcaraz Iranzo, Philipp K. Jenke, Joel D. Cox, Avinash Kumar, Hlib Bieliaiev, Sebastien Nanot, Cheng Peng, Dmitri K. Efetov, Jin-Yong Hong, Jing Kong, Dirk R. Englund, F. Javier Garcia de Abajo, Frank H. L. Koppens, Philip Walther
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Itai Epstein, David Alcaraz, Zhiqin Huang, Varun-Varma Pusapati, Jean-Paul Hugonin, Avinash Kumar, Xander Deputy, Tymofiy Khodkov, Tatiana G. Rappoport, Jin-Yong Hong, Nuno M. R. Peres, Jing Kong, David R. Smith, Frank H. L. Koppens
Summary: Acoustic-graphene-plasmons (AGPs) are highly confined electromagnetic modes in the Mid-infrared (MIR) to Terahertz (THz) spectra, enabling strong light-matter interactions. Exciting and detecting them is challenging due to their large momentum. Researchers demonstrated a new way to excite AGPs using localized graphene-plasmon-magnetic-resonators (GPMRs), allowing efficient excitation of single AGP cavities with record-breaking ultra-small mode-volumes.
OPTICAL SENSORS 2021
(2021)
Article
Materials Science, Multidisciplinary
Dong Seok Kim, Sung Hyun Kim, Jin-Yong Hong
Summary: A highly porous carbon foam (P-CF) with large pore volume was developed as an efficient scaffold for radionuclides adsorption, with Prussian Blue (PB) nanoparticles introduced onto the surface. The synthesized PB@P-CF exhibited enhanced adsorption capacity for Cesium ions and showed promising potential for radioactive materials adsorption/decontamination applications.
Proceedings Paper
Engineering, Electrical & Electronic
I. Alonso Calafell, L. A. Rozema, D. Alcaraz Iranzo, A. Trenti, J. D. Cox, A. Kumar, H. Bieliaiev, S. Nanot, C. Peng, D. K. Efetov, J. Y. Hong, J. Kong, D. Englund, F. J. Garcia de Abajo, F. H. L. Koppens, P. Walther
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)
