High Current Density and Low Thermal Conductivity of Atomically Thin Semimetallic WTe2.
ACS Nano
; 10(8): 7507-14, 2016 08 23.
Article
em En
| MEDLINE
| ID: mdl-27434729
Two-dimensional (2D) semimetals beyond graphene have been relatively unexplored in the atomically thin limit. Here, we introduce a facile growth mechanism for semimetallic WTe2 crystals and then fabricate few-layer test structures while carefully avoiding degradation from exposure to air. Low-field electrical measurements of 80 nm to 2 µm long devices allow us to separate intrinsic and contact resistance, revealing metallic response in the thinnest encapsulated and stable WTe2 devices studied to date (3-20 layers thick). High-field electrical measurements and electrothermal modeling demonstrate that ultrathin WTe2 can carry remarkably high current density (approaching 50 MA/cm(2), higher than most common interconnect metals) despite a very low thermal conductivity (of the order â¼3 Wm(-1) K(-1)). These results suggest several pathways for air-stable technological viability of this layered semimetal.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
ACS Nano
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Estados Unidos