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Title: Two-step growth of two-dimensional WSe2/MoSe2 heterostructures

Journal Article · · Nano Letters
 [1];  [1];  [1];  [2];  [1];  [3];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Rice Univ., Houston, TX (United States)
  2. Nanyang Technological Univ. (Singapore)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Two dimensional (2D) materials have attracted great attention due to their unique properties and atomic thickness. Although various 2D materials have been successfully synthesized with different optical and electrical properties, a strategy for fabricating 2D heterostructures must be developed in order to construct more complicated devices for practical applications. Here we demonstrate for the first time a two-step chemical vapor deposition (CVD) method for growing transition-metal dichalcogenide (TMD) heterostructures, where MoSe2 was synthesized first and followed by an epitaxial growth of WSe2 on the edge and on the top surface of MoSe2. Compared to previously reported one-step growth methods, this two-step growth has the capability of spatial and size control of each 2D component, leading to much larger (up to 169 μm) heterostructure size, and cross-contamination can be effectively minimized. Furthermore, this two-step growth produces well-defined 2H and 3R stacking in the WSe2/MoSe2 bilayer regions and much sharper in-plane interfaces than the previously reported MoSe2/WSe2 heterojunctions obtained from one-step growth methods. The resultant heterostructures with WSe2/MoSe2 bilayer and the exposed MoSe2 monolayer display rectification characteristics of a p-n junction, as revealed by optoelectronic tests, and an internal quantum efficiency of 91% when functioning as a photodetector. As a result, a photovoltaic effect without any external gates was observed, showing incident photon to converted electron (IPCE) efficiencies of approximately 0.12%, providing application potential in electronics and energy harvesting.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1214512
Journal Information:
Nano Letters, Vol. 15, Issue 9; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 426 works
Citation information provided by
Web of Science

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Novel Optoelectronic Devices: Transition-Metal-Dichalcogenide-Based 2D Heterostructures journal January 2018
Atomic scale depletion region at one dimensional MoSe 2 -WSe 2 heterointerface journal December 2018
Van der Waals epitaxial growth and optoelectronics of large-scale WSe2/SnS2 vertical bilayer p–n junctions journal December 2017
Challenges and recent advancements of functionalization of two-dimensional nanostructured molybdenum trioxide and dichalcogenides journal January 2019
Booming Development of Group IV–VI Semiconductors: Fresh Blood of 2D Family journal June 2016
Recent Progress on Two‐Dimensional Heterostructures for Catalytic, Optoelectronic, and Energy Applications journal April 2019
In-plane interfacing effects of two-dimensional transition-metal dichalcogenide heterostructures journal January 2016
Epitaxial growth of HfS 2 on sapphire by chemical vapor deposition and application for photodetectors journal July 2017
Inorganic 2D Luminescent Materials: Structure, Luminescence Modulation, and Applications journal October 2019
The Role of Graphene and Other 2D Materials in Solar Photovoltaics journal September 2018
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2D/2D Heterojunctions for Catalysis journal January 2019
Broadband photodetection of 2D Bi2O2Se–MoSe2 heterostructure journal September 2019
A two-dimensional vertical van der Waals heterostructure based on g-GaN and Mg(OH) 2 used as a promising photocatalyst for water splitting: A first-principles calculation journal August 2019
Few-Layer β - Sn Se with Strong Visible Light Absorbance and Ultrahigh Carrier Mobility journal January 2020
Integrated Quasiplane Heteronanostructures of MoSe 2 /Bi 2 Se 3 Hexagonal Nanosheets: Synergetic Electrocatalytic Water Splitting and Enhanced Supercapacitor Performance journal November 2017
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