Probing the origin of lateral heterogeneities in synthetic monolayer molybdenum disulfide

Kehao Zhang, Yuanxi Wang, Jaydeep Joshi, Fu Zhang, Shruti Subramanian, Mauricio Terrones Maldonado, Patrick Vora, Vincent Henry Crespi, Joshua Alexander Robinson

Research output: Contribution to journalArticle

Abstract

Synthetic two-dimensional (2D) materials provide an opportunity to realize large-scale applications in next generation electronic and optoelectronic devices. One of the biggest challenges of synthetic 2D materials is the lateral heterogeneity such as non-uniform strain, composition and defect density. The electronic and optical properties are found to be not uniform in many cases, even within a single crystalline domain, potentially limiting synthetic 2D materials in advanced devices. In this work, we probe the origin of the widely observed lateral heterogeneities in synthetic monolayer MoS2. Epitaxial single crystalline domains (∼10 μm) are optically homogeneous and uniform with 0.3%-0.4% tensile strain, while misoriented domains (>20 μm) exhibit distinct photoluminescence (PL) emissions from the center to the edge, along with released strain at the center. Temperature-dependent Raman and PL mapping reveals that the center of non-epitaxial domains exhibits an enhanced PL due to increased defect density. Density function theory (DFT) calculations suggest that oxygen defects can readily lead the loss of epitaxy, consistent with our observation of a MoOx core-shell structure that only exists in misoriented domains. Combining experiment and DFT, we hypothesize that two growth mechanisms, solid-solid and vapor-solid growth, may be responsible for the lateral heterogeneities.

Original languageEnglish (US)
Article number025008
Journal2D Materials
Volume6
Issue number2
DOIs
StatePublished - Feb 1 2019

Fingerprint

molybdenum disulfides
Molybdenum
Monolayers
Photoluminescence
Defect density
Probability density function
Crystalline materials
photoluminescence
Tensile strain
defects
Epitaxial growth
Electronic properties
Optoelectronic devices
Optical properties
Vapors
Oxygen
Defects
optoelectronic devices
electronics
epitaxy

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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title = "Probing the origin of lateral heterogeneities in synthetic monolayer molybdenum disulfide",
abstract = "Synthetic two-dimensional (2D) materials provide an opportunity to realize large-scale applications in next generation electronic and optoelectronic devices. One of the biggest challenges of synthetic 2D materials is the lateral heterogeneity such as non-uniform strain, composition and defect density. The electronic and optical properties are found to be not uniform in many cases, even within a single crystalline domain, potentially limiting synthetic 2D materials in advanced devices. In this work, we probe the origin of the widely observed lateral heterogeneities in synthetic monolayer MoS2. Epitaxial single crystalline domains (∼10 μm) are optically homogeneous and uniform with 0.3{\%}-0.4{\%} tensile strain, while misoriented domains (>20 μm) exhibit distinct photoluminescence (PL) emissions from the center to the edge, along with released strain at the center. Temperature-dependent Raman and PL mapping reveals that the center of non-epitaxial domains exhibits an enhanced PL due to increased defect density. Density function theory (DFT) calculations suggest that oxygen defects can readily lead the loss of epitaxy, consistent with our observation of a MoOx core-shell structure that only exists in misoriented domains. Combining experiment and DFT, we hypothesize that two growth mechanisms, solid-solid and vapor-solid growth, may be responsible for the lateral heterogeneities.",
author = "Kehao Zhang and Yuanxi Wang and Jaydeep Joshi and Fu Zhang and Shruti Subramanian and {Terrones Maldonado}, Mauricio and Patrick Vora and Crespi, {Vincent Henry} and Robinson, {Joshua Alexander}",
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Probing the origin of lateral heterogeneities in synthetic monolayer molybdenum disulfide. / Zhang, Kehao; Wang, Yuanxi; Joshi, Jaydeep; Zhang, Fu; Subramanian, Shruti; Terrones Maldonado, Mauricio; Vora, Patrick; Crespi, Vincent Henry; Robinson, Joshua Alexander.

In: 2D Materials, Vol. 6, No. 2, 025008, 01.02.2019.

Research output: Contribution to journalArticle

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AU - Wang, Yuanxi

AU - Joshi, Jaydeep

AU - Zhang, Fu

AU - Subramanian, Shruti

AU - Terrones Maldonado, Mauricio

AU - Vora, Patrick

AU - Crespi, Vincent Henry

AU - Robinson, Joshua Alexander

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