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Title: Strain-engineered optoelectronic properties of 2D transition metal dichalcogenide lateral heterostructures

Journal Article · · 2D Materials
 [1];  [2];  [2];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences; Pusan National Univ., Busan (Korea, Republic of). Dept. of Physics
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences. Computer Science and Mathematics Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy

Compared with their bulk counterparts, 2D materials can sustain much higher elastic strain at which optical quantities such as bandgaps and absorption spectra governing optoelectronic device performance can be modified with relative ease. Using first-principles density functional theory and quasiparticle GW calculations, we demonstrate how uniaxial tensile strain can be utilized to optimize the electronic and optical properties of transition metal dichalcogenide lateral (in-plane) heterostructures such as MoX2/WX2 (X = S, Se, Te). We find that these lateral-type heterostructures may facilitate efficient electron–hole separation for light detection/harvesting and preserve their type II characteristic up to 12% of uniaxial strain. Based on the strain-dependent bandgap and band offset, we show that uniaxial tensile strain can significantly increase the power conversion efficiency of these lateral heterostructures. Our results suggest that these strain-engineered lateral heterostructures are promising for optimizing optoelectronic device performance by selectively tuning the energetics of the bandgap.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC); USDOE Laboratory Directed Research and Development (LDRD) Program
Contributing Organization:
Pusan National Univ., Busan (Korea, Republic of); Univ. of Tennessee, Knoxville, TN (United States)
Grant/Contract Number:
AC05-00OR22725; AC02-05CH11231
OSTI ID:
1346620
Journal Information:
2D Materials, Vol. 4, Issue 2; ISSN 2053-1583
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 79 works
Citation information provided by
Web of Science

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Charge Density Waves Driven by Peierls Instability at the Interface of Two‐Dimensional Lateral Heterostructures journal October 2018
Recent Advances in 2D Lateral Heterostructures journal June 2019
Type-II InSe/MoSe 2 (WSe 2 ) van der Waals heterostructures: vertical strain and electric field effects journal January 2018
Dose-dependent effect of proton irradiation on electrical properties of WSe 2 ambipolar field effect transistors journal January 2019
Bidirectional heterostructures consisting of graphene and lateral MoS 2 /WS 2 composites: a first-principles study journal January 2019
Strain-controlled magnetic and optical properties of monolayer 2 H TaS e 2 journal August 2019
Heterogeneous Integration of 2D Materials: Recent Advances in Fabrication and Functional Device Applications journal December 2019
Emerging photoluminescence from defective vanadium diselenide nanosheets journal January 2018
The GW Compendium: A Practical Guide to Theoretical Photoemission Spectroscopy journal July 2019
Physical Properties and Photovoltaic Application of Semiconducting Pd2Se3 Monolayer journal October 2018