Role of Heterointerface in Lithium-Induced Phase Transition in Td-WTe2 Nanoflakes

Xu, Shiyu; Wang, Mengjing; Bambrick-Santoyo, Maria; Evans-Lutterodt, Kenneth; Williams, Natalie L.; Cha, Judy J.

doi:10.1021/acsaelm.3c01329

Role of Heterointerface in Lithium-Induced Phase Transition in T_d-WTe₂ Nanoflakes

Journal Article · Wed Feb 14 00:00:00 EST 2024 · ACS Applied Electronic Materials

DOI:https://doi.org/10.1021/acsaelm.3c01329· OSTI ID:2311084

^[1]; Wang, Mengjing ^[2]; Bambrick-Santoyo, Maria ^[3]; Evans-Lutterodt, Kenneth ^[4]; Williams, Natalie L. ^[2]; ^[2]

Cornell Univ., Ithaca, NY (United States); Yale Univ., New Haven, CT (United States)
Cornell Univ., Ithaca, NY (United States)
Yale Univ., New Haven, CT (United States)
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

A new polytype of WTe₂ with a bandgap has been recently discovered through the intercalation of lithium into the van der Waals gaps of T_d-WTe₂. Here, we report the effects of reduced thicknesses and heterointerfaces on the intercalation-induced phase transition in WTe₂. Using in situ Raman spectroscopy during the electrochemical lithiation of WTe₂ flakes as a function of flake thickness, we observe that additional electrochemical energy is required for the phase transition of WTe₂ from the T_d phase to the new lithiated T_d' phase, going from 0.8 V of the applied electrochemical voltage for a thick flake to 0.5 V and 0.3 V for 7- and 5-layered samples, respectively. We ascribe this suppression of the phase transition to the interfacial interaction between the nanoflake and SiO₂/Si substrate, which plays an increasing role as the sample thickness is reduced. The suppressed kinetics of the phase transition can be mitigated by placing the WTe₂ flake on a hexagonal boron nitride (hBN) flake, which facilitates the release of the in-plane strain induced by the phase transition. Importantly, our study underscores the significance of interfacial effects in modulating phase transitions in two-dimensional (2D) materials, suggesting heterogeneous transition pathways, as well as interfacial engineering to control these phase transitions.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: SC0012704

OSTI ID:: 2311084

Report Number(s):: BNL--225313-2024-JAAM

Journal Information:: ACS Applied Electronic Materials, Journal Name: ACS Applied Electronic Materials Journal Issue: 2 Vol. 6; ISSN 2637-6113

Publisher:: ACS PublicationsCopyright Statement

Country of Publication:: United States

Language:: English

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