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Ahn H, Moon G, Jung HG, Deng B, Yang DH, Yang S, Han C, Cho H, Yeo Y, Kim CJ, Yang CH, Kim J, Choi SY, Park H, Jeon J, Park JH, Jo MH. Integrated 1D epitaxial mirror twin boundaries for ultrascaled 2D MoS 2 field-effect transistors. NATURE NANOTECHNOLOGY 2024; 19:955-961. [PMID: 38961247 DOI: 10.1038/s41565-024-01706-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2023] [Accepted: 05/29/2024] [Indexed: 07/05/2024]
Abstract
In atomically thin van der Waals materials, grain boundaries-the line defects between adjacent crystal grains with tilted in-plane rotations-are omnipresent. When the tilting angles are arbitrary, the grain boundaries form inhomogeneous sublattices, giving rise to local electronic states that are not controlled. Here we report on epitaxial realizations of deterministic MoS2 mirror twin boundaries (MTBs) at which two adjoining crystals are reflection mirroring by an exactly 60° rotation by position-controlled epitaxy. We showed that these epitaxial MTBs are one-dimensionally metallic to a circuit length scale. By utilizing the ultimate one-dimensional (1D) feature (width ~0.4 nm and length up to a few tens of micrometres), we incorporated the epitaxial MTBs as a 1D gate to build integrated two-dimensional field-effect transistors (FETs). The critical role of the 1D MTB gate was verified to scale the depletion channel length down to 3.9 nm, resulting in a substantially lowered channel off-current at lower gate voltages. With that, in both individual and array FETs, we demonstrated state-of-the-art performances for low-power logics. The 1D epitaxial MTB gates in this work suggest a novel synthetic pathway for the integration of two-dimensional FETs-that are immune to high gate capacitance-towards ultimate scaling.
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Affiliation(s)
- Heonsu Ahn
- Center for Van der Waals Quantum Solids, Institute for Basic Science, Pohang, Korea
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Korea
| | - Gunho Moon
- Center for Van der Waals Quantum Solids, Institute for Basic Science, Pohang, Korea
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Korea
| | - Hang-Gyo Jung
- Department of Semiconductor Convergence Engineering, Sungkyunkwan University, Suwon, Korea
| | - Bingchen Deng
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA
- Department of Physics, Harvard University, Cambridge, MA, USA
| | - Dong-Hwan Yang
- Center for Van der Waals Quantum Solids, Institute for Basic Science, Pohang, Korea
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Korea
| | - Sera Yang
- Center for Van der Waals Quantum Solids, Institute for Basic Science, Pohang, Korea
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Korea
| | - Cheolhee Han
- Center for Van der Waals Quantum Solids, Institute for Basic Science, Pohang, Korea
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Korea
| | - Hyunje Cho
- Center for Van der Waals Quantum Solids, Institute for Basic Science, Pohang, Korea
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Korea
| | - Youngki Yeo
- Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon, Korea
| | - Cheol-Joo Kim
- Center for Van der Waals Quantum Solids, Institute for Basic Science, Pohang, Korea
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, Korea
| | - Chan-Ho Yang
- Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon, Korea
| | - Jonghwan Kim
- Center for Van der Waals Quantum Solids, Institute for Basic Science, Pohang, Korea
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Korea
| | - Si-Young Choi
- Center for Van der Waals Quantum Solids, Institute for Basic Science, Pohang, Korea
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Korea
| | - Hongkun Park
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA
- Department of Physics, Harvard University, Cambridge, MA, USA
| | - Jongwook Jeon
- Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, Korea
| | - Jin-Hong Park
- Department of Semiconductor Convergence Engineering, Sungkyunkwan University, Suwon, Korea
- Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, Korea
| | - Moon-Ho Jo
- Center for Van der Waals Quantum Solids, Institute for Basic Science, Pohang, Korea.
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Korea.
- Department of Physics, Pohang University of Science and Technology, Pohang, Korea.
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Tai R, Gao S, Tang Y, Ma X, Ding P, Wu R, Li P, Song X, Chen S, Wang Q. Defect Engineering of Bi 2WO 6 for Enhanced Photocatalytic Degradation of Antibiotic Pollutants. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2310785. [PMID: 38334181 DOI: 10.1002/smll.202310785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 01/24/2024] [Indexed: 02/10/2024]
Abstract
Infiltration of excessive antibiotics into aquatic ecosystems plays a significant role in antibiotic resistance, a major global health challenge. It is therefore critical to develop effective technologies for their removal. Herein, defect-rich Bi2WO6 nanoparticles are solvothermally prepared via epitaxial growth on pristine Bi2WO6 seed nanocrystals, and the efficiency of the photocatalytic degradation of ciprofloxacin, a common antibiotic, is found to increase markedly from 62.51% to 98.27% under visible photoirradiation for 60 min. This is due to the formation of a large number of structural defects, where the synergistic interactions between grain boundaries and adjacent dislocations and oxygen vacancies lead to an improved separation and migration efficiency of photogenerated carriers and facilitate the adsorption and degradation of ciprofloxacin, as confirmed in experimental and theoretical studies. Results from this work demonstrate the unique potential of defect engineering for enhanced photocatalytic performance, a critical step in removing antibiotic contaminants in aquatic ecosystems.
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Affiliation(s)
- Ran Tai
- Laboratory for Micro-sized Functional Materials & College of Elementary Education and Department of Chemistry, Capital Normal University, Beijing, 100048, China
| | - Shuai Gao
- Laboratory for Micro-sized Functional Materials & College of Elementary Education and Department of Chemistry, Capital Normal University, Beijing, 100048, China
| | - Yao Tang
- Laboratory for Micro-sized Functional Materials & College of Elementary Education and Department of Chemistry, Capital Normal University, Beijing, 100048, China
| | - Xinbo Ma
- Laboratory for Micro-sized Functional Materials & College of Elementary Education and Department of Chemistry, Capital Normal University, Beijing, 100048, China
| | - Peiren Ding
- Laboratory for Micro-sized Functional Materials & College of Elementary Education and Department of Chemistry, Capital Normal University, Beijing, 100048, China
| | - Runjie Wu
- Laboratory for Micro-sized Functional Materials & College of Elementary Education and Department of Chemistry, Capital Normal University, Beijing, 100048, China
| | - Peishen Li
- College of Environmental Sciences and Engineering, The Key Laboratory of Water and Sediment Sciences (MOE), Peking University, Beijing, 100871, China
| | - Xingjian Song
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, CA, 95064, USA
| | - Shaowei Chen
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, CA, 95064, USA
| | - Qiang Wang
- Laboratory for Micro-sized Functional Materials & College of Elementary Education and Department of Chemistry, Capital Normal University, Beijing, 100048, China
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Naito H, Makino Y, Zhang W, Ogawa T, Endo T, Sannomiya T, Kaneda M, Hashimoto K, Lim HE, Nakanishi Y, Watanabe K, Taniguchi T, Matsuda K, Miyata Y. High-throughput dry transfer and excitonic properties of twisted bilayers based on CVD-grown transition metal dichalcogenides. NANOSCALE ADVANCES 2023; 5:5115-5121. [PMID: 37705802 PMCID: PMC10496764 DOI: 10.1039/d3na00371j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 08/21/2023] [Indexed: 09/15/2023]
Abstract
van der Waals (vdW) layered materials have attracted much attention because their physical properties can be controlled by varying the twist angle and layer composition. However, such twisted vdW assemblies are often prepared using mechanically exfoliated monolayer flakes with unintended shapes through a time-consuming search for such materials. Here, we report the rapid and dry fabrication of twisted multilayers using chemical vapor deposition (CVD) grown transition metal chalcogenide (TMDC) monolayers. By improving the adhesion of an acrylic resin stamp to the monolayers, the single crystals of various TMDC monolayers with desired grain size and density on a SiO2/Si substrate can be efficiently picked up. The present dry transfer process demonstrates the one-step fabrication of more than 100 twisted bilayers and the sequential stacking of a twisted 10-layer MoS2 single crystal. Furthermore, we also fabricated hBN-encapsulated TMDC monolayers and various twisted bilayers including MoSe2/MoS2, MoSe2/WSe2, and MoSe2/WS2. The interlayer interaction and quality of dry-transferred, CVD-grown TMDCs were characterized by using photoluminescence (PL), cathodoluminescence (CL) spectroscopy, and cross-sectional electron microscopy. The prominent PL peaks of interlayer excitons can be observed for MoSe2/MoS2 and MoSe2/WSe2 with small twist angles at room temperature. We also found that the optical spectra were locally modulated due to nanosized bubbles, which are formed by the presence of interface carbon impurities. The present findings indicate the widely applicable potential of the present method and enable an efficient search of the emergent optical and electrical properties of TMDC-based vdW heterostructures.
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Affiliation(s)
- Hibiki Naito
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Yasuyuki Makino
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Wenjin Zhang
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Tomoya Ogawa
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Takahiko Endo
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Takumi Sannomiya
- Department of Materials Science and Engineering, Tokyo Institute of Technology Yokohama 226-8503 Japan
| | - Masahiko Kaneda
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Kazuki Hashimoto
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Hong En Lim
- Department of Chemistry, Saitama University Saitama 338-8570 Japan
| | - Yusuke Nakanishi
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Kenji Watanabe
- Research Center for Electronic and Optical Materials, NIMS Tsukuba 305-0044 Japan
| | - Takashi Taniguchi
- Research Center for Materials Nanoarchitectonics, NIMS Tsukuba 305-0044 Japan
| | - Kazunari Matsuda
- Institute of Advanced Energy, Kyoto University Kyoto 611-0011 Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
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