Journal
ACS MATERIALS LETTERS
Volume 3, Issue 4, Pages 442-453Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsmaterialslett.0c00554
Keywords
-
Categories
Funding
- King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) [OSR-2018CARF/CCF-3079]
- KAUST Catalysis Center
- KAUST Solar Center
- Ministry of Science and Technology of Taiwan [MOST-108-2119-M-009-011-MY3, MOST-107-2112-M-009024-MY3]
- CEFMS of NCTU - Ministry of Education of Taiwan
- Core Lab in KAUST
Ask authors/readers for more resources
The study presents a two-step epitaxy strategy for promoting the growth of second-layer TMDCs on the basal plane of the first TMDCs epilayer. By controlling the tensile strength of the substrate through chemical environments, high-density TMDC homo- and hetero bilayers were successfully grown with high yield and uniformity.
Transition-metal dichalcogenide (TMDC) homo- and heterostacks hold tantalizing prospects for being integrated as active components in future van der Waals (vdW) electronics and optoelectronics. However, most TMDC homo- and heterostacks are created by onerous mechanical exfoliation, followed by a mixing-and-matching process. While versatile enough for pilot demonstrations, these strategies are clearly not scalable for practical technologies and widespread implementations. Here, we report a two-step epitaxy strategy that promotes the growth of second-layer TMDCs on the basal plane of the first TMDCs epilayer. The first-layer TMDCs are grown on substrates where the tensile strength can be tuned by the control of chemical environments. The succeeding epilayers then prefer to grow layer-by-layer on the highly tensile-strained first layers. The result is the growth of high-density TMDC homo (WSe2) bilayers and hetero (WSe2-MoS2) bilayers with an exceedingly high yield (>99% bilayers) and uniformity. A density functional theory simulation further sheds light on how strain engineering shifts the subsequent layer growth preference. Second-harmonic generation and high-angle annular dark-field scanning transmission electron microscopy collectively attest to the AB and AA' stacking between the TMDC epi- and overlayers. The proposed strategy could be a versatile platform for synthesizing diverse arrays of vdW homo- and heterostacks, thus providing prospects for realizing large-scale and layer-controllable two-dimensional electronics.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available