A unified approach and descriptor for the thermal expansion of two-dimensional transition metal dichalcogenide monolayers
Author(s)
Zhong, Yang; Zhang, Lenan; Park, Ji-Hoon; Cruz, Samuel; Li, Long; Guo, Liang; Kong, Jing; Wang, Evelyn N; ... Show more Show less
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Two-dimensional (2D) materials have enabled promising applications in modern miniaturized devices. However, device operation may lead to substantial temperature rise and thermal stress, resulting in device failure. To address such thermal challenges, the thermal expansion coefficient (TEC) needs to be well understood. Here, we characterize the in-plane TECs of transition metal dichalcogenide (TMD) monolayers and demonstrate superior accuracy using a three-substrate approach. Our measurements confirm the physical range of 2D monolayer TECs and, hence, address the more than two orders of magnitude discrepancy in literature. Moreover, we identify the thermochemical electronegativity difference of compositional elements as a descriptor, enabling the fast estimation of TECs for various TMD monolayers. Our work presents a unified approach and descriptor for the thermal expansion of TMD monolayers, which can serve as a guideline toward the rational design of reliable 2D devices.
Date issued
2022-11-16Department
Massachusetts Institute of Technology. Department of Mechanical Engineering; Massachusetts Institute of Technology. Department of Electrical Engineering and Computer ScienceJournal
Science Advances
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Zhong, Yang, Zhang, Lenan, Park, Ji-Hoon, Cruz, Samuel, Li, Long et al. 2022. "A unified approach and descriptor for the thermal expansion of two-dimensional transition metal dichalcogenide monolayers." Science Advances, 8 (46).
Version: Final published version