journal article·2023-12-27

Observation of Sub-10 nm Transition Metal Dichalcogenide Nanocrystals in Rapidly Heated van der Waals Heterostructures

Pawan Kumar, Jiazheng Chen, Andrew C. Meng, Wei-Chang D. Yang, Surendra B. Anantharaman, James P. Horwath, Juan C. Idrobo, Himani Mishra, Yuanyue Liu, Albert V. Davydov, Eric A. Stach, Deep Jariwala

ACS Applied Materials & Interfaces· Volume 15· Issue 51
Publisher page

Abstract

Two-dimensional materials, such as transition metal dichalcogenides (TMDCs), have the potential to revolutionize the field of electronics and photonics due to their unique physical and structural properties. This research presents a novel method for synthesizing crystalline TMDCs crystals with <10 nm size using ultrafast migration of vacancies at elevated temperatures. Through in situ and ex situ processing and using atomic-level characterization techniques, we analyzed the shape, size, crystallinity, composition, and strain distribution of these nanocrystals. These nanocrystals exhibit electronic structure signatures that differ from the 2D bulk: i.e., uniform mono- and multilayers. Further, our in situ, vacuum-based synthesis technique allows observation and comparison of defect and phase evolution in these crystals formed under van der Waals heterostructure confinement versus unconfined conditions. Overall, this research demonstrates a solid-state route to synthesizing uniform nanocrystals of TMDCs and lays the foundation for materials science in confined 2D spaces under extreme conditions.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: 2D Materials and Applications · MXene and MAX Phase Materials · Graphene research and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States

Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States

Inter-university Microelectronics Center (IMEC), Leuven 3001, Belgium

Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, United States

National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States

Low-dimensional Semiconductors Lab, Metallurgical and Materials Engineering, Indian Institute of Technology-Madras, Chennai, Tamilnadu 600036, India

Argonne National Laboratory, Lemont, Illinois 60439, United States

Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States

Materials Science & Engineering, University of Washington, Seattle, Washington 98195, United States

Department of Mechanical Engineering and Texas Materials Institute, University of Texas, Austin, Texas 78712, United States

Funding

U.S. Department of Defense · National Science Foundation

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