Article
Chemistry, Multidisciplinary
Yuya Murai, Shaochun Zhang, Takato Hotta, Zheng Liu, Takahiko Endo, Hiroshi Shimizu, Yasumitsu Miyata, Toshifumi Irisawa, Yanlin Gao, Mina Maruyama, Susumu Okada, Hiroyuki Mogi, Tomohiro Sato, Shoji Yoshida, Hidemi Shigekawa, Takashi Taniguchi, Kenji Watanabe, Ruben Canton-Vitoria, Ryo Kitaura
Summary: A simple and direct method has been developed for controlled postdoping of 2D transition metal dichalcogenides using low-kinetic-energy dopant beams and high-flux chalcogen beams. The doped TMDs showed significant changes in electronic properties, with p-type action and a drastic increase in current. Position-selective doping was also demonstrated using a patterned mask on the surface, showing the versatility of this postdoping method for future 2D-based electronics.
Article
Chemistry, Physical
Baorui Xia, Junfu Li, Haiyi Zhang, Daqiang Gao, Desheng Xue
Summary: In this study, intrinsic ferromagnetism was induced in ReS2 nanosheets through F adsorbing effect, allowing for room temperature retention of ferromagnetism. The magnetism was found to be dependent on the F adsorbing content, which could be controlled through fluoridation process. This work provides an effective strategy for introducing room temperature ferromagnetism in ReS2, guiding magnetic investigations on transition metal dichalcogenides.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Review
Chemistry, Multidisciplinary
Xiaohui Li, Junbo Yang, Hang Sun, Ling Huang, Hui Li, Jianping Shi
Summary: This review provides a systematic and in-depth summary of high-performance device applications of 2D semiconducting TMDCs, including the controlled synthesis of wafer-scale 2D TMDCs polycrystalline and single-crystal films, the accurate doping of 2D semiconducting TMDCs and its effect on device performances, and the challenges and further research directions for improving electronic device performances of 2D semiconducting TMDCs.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Johanna P. Carbone, Dongwook Go, Yuriy Mokrousov, Gustav Bihlmayer, Stefan Bluegel
Summary: Motivated by recent progress in two-dimensional spintronics, this study presents a promising platform for engineering spin-orbit effects and Berry curvature by depositing a monolayer of Europium on 1H-WSe2. First-principles calculations based on density functional theory reveal intriguing properties such as high magnetic anisotropy, valley-dependent polarization of spin and orbital angular momenta, and Rashba textures in Eu/WSe2. These properties originate from magnetic and spin-orbit proximity effects and the interplay between localized 4 f magnetic moments of Eu and mobile charge carriers of Eu and WSe2. The study suggests that depositing 4 f rare-earth metals on transition-metal dichalcogenides can be a promising platform for two-dimensional spintronics.
Article
Chemistry, Multidisciplinary
Flavio Della Pelle, Qurat Ul Ain Bukhari, Ruslan Alvarez Diduk, Annalisa Scroccarello, Dario Compagnone, Arben Merkoci
Summary: We introduce a CO2 laser plotter-based technology for the production of heterostructures (HTs) comprising reduced graphene oxide (rGO) and 2D transition metal dichalcogenides (TMDs). The laser treatment converts GO into highly exfoliated and conductive rGO decorated with small TMD/TM-oxide nanoflakes. The freestanding LIHT films obtained exhibit excellent performance as self-contained sensors with nanomolar limits of detection and high fouling resistance.
Article
Chemistry, Multidisciplinary
Onejae Sul, Hojun Seo, Eunsuk Choi, Sunjin Kim, Jinsil Gong, Jiyoung Bang, Hyoungbeen Ju, Sehoon Oh, Yeonsu Lee, Hyeonjeong Sun, Minjin Kwon, Kyungnam Kang, Jinki Hong, Eui-Hyeok Yang, Yunchul Chung, Seung-Beck Lee
Summary: Development of a reliable doping method for 2D materials is crucial for their adoption in future microelectronic circuits. This study demonstrates hole doping of tungsten disulfide using a silicon substrate as the dopant medium. The fabricated devices show ultra-low power consumption, high stability, and a large output current ratio.
Article
Chemistry, Physical
Mengqi Fang, Eui-Hyeok Yang
Summary: Transition metal dichalcogenides (TMDs) are 2D materials with remarkable electrical, optical, and chemical properties. One strategy to modify their properties is through dopant-induced alloy creation. Dopants in TMDs can introduce additional states within the bandgap, leading to changes in optical, electronic, and magnetic properties. This review paper provides a comprehensive summary of dopant-induced magnetic properties and their impact on TMDs, which can guide further research for applications in spintronics, optoelectronics, and magnetic memory devices.
Review
Materials Science, Multidisciplinary
Min Wu, Yonghong Xiao, Yang Zeng, Yuanliang Zhou, Xiangbin Zeng, Lining Zhang, Wugang Liao
Summary: This article reviews the research progress in the preparation and applications of ultrathin two-dimensional transition-metal dichalcogenides (TMDCs) and TMDCs-based heterojunctions over the past decade. It comprehensively outlines the preparation methods and recent advancements in electronic and optoelectronic devices.
Article
Multidisciplinary Sciences
Aaron Hernan Barajas-Aguilar, Andres Garay-Tapia, Elodie Strupiechonski, Manuel Alejandro Justo-Guerrero, Jose Santos-Cruz, Sergio Jimenez-Sandoval
Summary: In this study, a density functional theory analysis was conducted to determine the phonon dispersion curves of titanium disulfide (TiS2), taking into account the frequencies of all available experimental phonon data. The incorrect frequency assignment of the A(2u) mode in the literature was thoroughly discussed, and results of attenuated total reflection terahertz spectroscopy applied to TiS2 were provided. A self-intercalation paradigm was proposed to explain the temperature dependence of poorly understood Raman features observed in pristine TiS2 at frequencies above the A(1g) mode.
ADVANCED THEORY AND SIMULATIONS
(2023)
Article
Nanoscience & Nanotechnology
Minglei Sun, Michele Re Fiorentin, Udo Schwingenschlogl, Maurizia Palummo
Summary: Semiconducting two-dimensional materials with the chemical formula MoSi2X4 (X = N, P, or As) were studied using atomistic simulations. It was found that MoSi2X4 has promising optical properties, such as the absence of lateral valleys, small exciton binding energies, and long radiative lifetimes, making it suitable for applications in optoelectronic devices.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Article
Chemistry, Physical
Yingwei Wang, Li Zhou, Mianzeng Zhong, Yanping Liu, Si Xiao, Jun He
Summary: The emerging subclass of noble-transition-metal dichalcogenides (NMDs) has sparked an increase in research on two-dimensional (2D) materials, featuring unique structures and useful properties. These 2D NMDs are promising candidates for a wide range of applications in optics, with discussions on their research status, structures, properties, synthesis, and potential applications, as well as insights into expected future developments.
Article
Chemistry, Multidisciplinary
Zexin Li, Dongyan Li, Haoyun Wang, Xiang Xu, Lejing Pi, Ping Chen, Tianyou Zhai, Xing Zhou
Summary: Spatially controlled and universal p-type doping of TMDs is achieved through Sn4+ ion exchange, allowing for the modulation of material polarity and improvement of the work function.
Article
Chemistry, Multidisciplinary
Yung-Chang Lin, Jeyakumar Karthikeyan, Yao-Pang Chang, Shisheng Li, Silvan Kretschmer, Hannu-Pekka Komsa, Po-Wen Chiu, Arkady V. Krasheninnikov, Kazu Suenaga
Summary: The study investigates post-growth doping of transition metal atoms in single layers of WSe2, successfully achieving high densities of various types of impurity atoms. The dopants are predominantly confined within nanostripes embedded in the pristine WSe2, with dislocations aiding in the incorporation of dopants and the formation of stripes of TM dopant atoms.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Peter D. Reyntjens, Sabyasachi Tiwari, Maarten L. van de Put, Bart Soree, William G. Vandenberghe
Summary: By studying the magnetic properties of PtSe2 intercalated with Ti, V, Cr, and Mn, different magnetic groundstates and critical temperatures were identified. The introduction of Pt vacancies was shown to alter the magnetic groundstate and critical temperature of intercalated PtSe2, suggesting the potential for controlling the magnetic properties through defect engineering.
Review
Crystallography
Mingyue Zhao, Yurui Hao, Chen Zhang, Rongli Zhai, Benqing Liu, Wencheng Liu, Cong Wang, Syed Hassan Mujtaba Jafri, Aamir Razaq, Raffaello Papadakis, Jiangwei Liu, Xiaoling Ye, Xiaoxiao Zheng, Hu Li
Summary: This review provides a comprehensive summary of the recent advances in 2D materials for optoelectronic approaches, including morphology and structure, optical properties, synthesis methods, and detailed applications. The challenges and perspectives in the current development of 2D materials are also discussed, providing a reference for further explorations and innovations of optoelectronic devices based on 2D materials.
Article
Nanoscience & Nanotechnology
Mohammad Bagheri, Hannu-Pekka Komsa
Summary: As nanoelectronic devices based on 2D materials continue to advance, optimizing the properties of the 2D material and its interfaces with other materials is crucial. A recent study introduces the use of 0D material, consisting of vdW-bonded Sb2O3 clusters, as a promising insulating substrate and gate dielectric. Computational screening identifies 16 materials with high melting points, high band gaps, and various static dielectric constants, offering potential for nanoelectronics applications.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Marco Lunardon, Tomasz Kosmala, Mahdi Ghorbani-Asl, Arkady V. Krasheninnikov, Sadhu Kolekar, Christian Durante, Matthias Batzill, Stefano Agnoli, Gaetano Granozzi
Summary: Unraveling the structure-activity relationships in catalysis is challenging due to the complexity and heterogeneity of materials. This study utilizes electrochemical scanning tunneling microscopy (EC-STM) to analyze the noise in the current and evaluates the catalytic activity of different surface sites.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Peter Sutter, Hannu-Pekka Komsa, Kim Kisslinger, Eli Sutter
Summary: The emergence of atomically thin crystals has allowed the integration of different 2D materials in lateral heterostructures. This can also be extended to thicker layered crystals by attaching a second van der Waals material layer by layer on suitable seed crystals. This study demonstrates the integration of multilayer crystals of SnS and GeSe through lateral epitaxy, showing promising applications in optoelectronics and managing charge and thermal transport.
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, Physical
Yanmei Hu, Xiaohui Hu, Yifeng Wang, Chunhua Lu, Arkady V. Krasheninnikov, Zhongfang Chen, Litao Sun
Summary: By using density functional theory calculations, it is found that the use of 2D metals as electrodes can effectively suppress the Fermi level pinning effect and achieve tunable Schottky barrier in CrX3 (X = I, Br) monolayers. These findings are important for electrode selection and the development of CrX3-based spin devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Tom Barnowsky, Arkady V. Krasheninnikov, Rico Friedrich
Summary: In this study, a new group of non-van der Waals 2D materials with ultra low exfoliation energies derived from non-layered crystals is presented. The calculated results show that the exfoliation energies of these materials are close to traditional van der Waals bound 2D compounds. The candidates with the lowest energies, 2D SbTlO3 and MnNaCl3, exhibit appealing electronic, potential topological, and magnetic features.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Xuemei Zhang, Mahdi Ghorbani-Asl, Yongsheng Zhang, Arkady V. Krasheninnikov
Summary: Quasi-2D crystals were observed inside bi-layer graphene through in-situ TEM experiments. These crystals were found to have the FCC structure, nucleate at point defects in graphene, and contain impurity atoms. Using first-principles calculations, the interaction between isolated Li atoms and Li crystals with vacancy-type defects in graphene was studied, revealing that quasi-2D Li crystals encapsulated between graphene sheets nucleate at defects and have a strong interaction with the defects. The behavior of impurities in the encapsulated Li crystals was also investigated, showing that they impede the de-lithiation process. This theoretical work helps to rationalize the experimental results and provides insights into the role of impurities in the degradation of anode materials in Li-ion batteries.
MATERIALS TODAY ENERGY
(2023)
Article
Chemistry, Physical
Eli Sutter, Hannu-Pekka Komsa, Jacob S. French, Peter Sutter
Summary: Alloying of 2D/layered chalcogenide semiconductors allows tuning of their electronic and optical properties. In this study, alloying in the GeSe-GeS system is investigated, and the composition dependence of the band gaps is studied using scanning transmission electron microscopy. The results show that the band gaps of GeS(x)Se1-x alloy micro- and nanowires increase systematically with the sulfur content and exhibit small bowing. Additionally, pronounced size effects in the alloy nanowires provide access to higher-energy optoelectronic transitions. Overall, germanium monochalcogenide alloys show promise for applications in optoelectronics and photovoltaics.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Renna Shakir, Hannu-Pekka Komsa, A. S. K. Sinha, J. Karthikeyan
Summary: This study comprehensively investigates the role of halogen X (X = F, Cl, Br, and I) in improving the CO(2) reduction activity and selectivity of single Mn-atom-based active sites on g-C3N4. The halogen-modified MnN6 active site exhibits high hydrogen evolution reaction tolerance, leading to increased selectivity due to the increased electronic stability originated from half-filled d orbitals of the Mn atom. This research provides insights for the design of new CO2RR catalysts with improved selectivity and efficiency.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Mohammad Khazaei, Soungmin Bae, Rasoul Khaledialidusti, Ahmad Ranjbar, Hannu-Pekka Komsa, Somayeh Khazaei, Mohammad Bagheri, Vei Wang, Yasuhide Mochizuki, Mitsuaki Kawamura, Gianaurelio Cuniberti, S. Mehdi Vaez Allaei, Kaoru Ohno, Hideo Hosono, Hannes Raebiger
Summary: MAX phases are layered non-van der Waals materials composed of stacking hexagonal layers of transition metal (M), a group III-VI element(A), and carbon or nitrogen (X). Through high-throughput calculations, 761 dynamically stable MAX phases have been identified, with 466 structures potentially synthesizable. To discover new structural phases, 361 MAX systems with dynamical instabilities were investigated, leading to the discovery of novel superlattices by reconstructing the triangular lattice of A-atoms into 0D-clusters, quasi-1D-chains, or creating 2D Haeckelite or Kagome-like lattices. This work introduces a new approach to discovering novel MAX phases from conventional structures without element alloying.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Analytical
Michael Titze, Jonathan D. Poplawsky, Silvan Kretschmer, Arkady V. Krasheninnikov, Barney L. Doyle, Edward S. Bielejec, Gerhard Hobler, Alex Belianinov
Summary: Ion implantation is a crucial capability in the semiconductor industry. This study demonstrates a method for low-energy gold implantation and emphasizes the importance of model details in simulations.
Article
Nanoscience & Nanotechnology
Santosh Semwal, Renna Shakir, Jeyakumar Karthikeyan, Akhoury Sudhir Kumar Sinha, Umaprasana Ojha
Summary: In this study, the authors successfully synthesized NiFeOOH-Co9S8-n intercalated nanostructure arrays with bifunctionality for hydrogen evolution reaction (HER) and sulfion oxidation reaction (SOR). The nanocatalyst exhibited high electrocatalytic activity and sustainable high-efficient H-2 production at low potentials, suggesting its potential for commercial production of H-2 in the future.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Lucia Skopinski, Silvan Kretschmer, Philipp Ernst, Matthias Herder, Lukas Madauss, Lars Breuer, Arkady V. Krasheninnikov, Marika Schleberger
Summary: A key problem in ion-solid interaction is the lack of experimental access to the dynamics of the processes. In this study, substrate-supported monolayers of MoS2 were irradiated with highly charged xenon ions, and the emitted Mo particles were analyzed to determine their velocity distributions. The results indicate that the mechanisms of interaction and sputtering depend on the kinetic and potential energy of the projectile, with potential sputtering being primarily related to electron-phonon coupling.
Article
Chemistry, Physical
Vimukthi Pathirage, Nirosha Ravinath Rajapakse, Kinga Lasek, Igor Pis, Federica Bondino, Matthias Batzill
Summary: The Pt-Te compositional phase diagram consists of three different compositional line phases that can be described as layered van der Waals materials. By controlling the growth temperatures and using temperature programmed synchrotron photoemission spectroscopy, these phases can be synthesized and characterized. The materials exhibit excellent chemical stability, which is important for practical applications.
APPLIED SURFACE SCIENCE
(2024)