Van der Waals interaction-induced photoluminescence weakening and multilayer growth in epitaxially aligned WS 2

Hyun Goo Ji, Mina Maruyama, Adha Sukma Aji, Susumu Okada, Kazunari Matsuda, Hiroki Ago

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Recently, transition metal dichalcogenides (TMDCs) have attracted great interest due to their unique electronic and optical properties. Chemical vapor deposition (CVD) has been regarded as the most promising method for the synthesis of large-area TMDCs with high reproducibility. Having similar hexagonal crystal structures with many TMDCs, c-plane sapphire is commonly used as a growth substrate in CVD. However, few studies have been reported on the influence of the sapphire substrate on the growth behavior and physical properties of TMDCs. In this work, we demonstrate that higher strain is induced in epitaxially grown WS 2 grains via van der Waals interactions with sapphire as compared with misaligned WS 2 grains. In addition, this strain was found to enhance overlayer deposition on monolayer WS 2 , while multilayer growth was not observed in non-epitaxial WS 2 . Photoluminescence (PL) of the epitaxially grown WS 2 grains was reduced, reflecting the effective van der Waals interaction with sapphire. Moreover, low-temperature PL measurements revealed strong influence of the c-plane sapphire surface on the optical properties of WS 2 . Density functional theory (DFT) calculation supports that the aligned WS 2 grains are more strongly bound to the sapphire surface, as compared with misaligned WS 2 . Our work offers a new insight into the understanding of the influence of the substrate on the CVD-grown TMDC materials.

Original languageEnglish
Pages (from-to)29790-29797
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume20
Issue number47
DOIs
Publication statusPublished - Jan 1 2018

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Aluminum Oxide
Photoluminescence
Multilayers
sapphire
Transition metals
photoluminescence
transition metals
Chemical vapor deposition
vapor deposition
interactions
Substrates
Optical properties
optical properties
Electronic properties
Density functional theory
Monolayers
Physical properties
physical properties
Crystal structure
density functional theory

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Van der Waals interaction-induced photoluminescence weakening and multilayer growth in epitaxially aligned WS 2 . / Ji, Hyun Goo; Maruyama, Mina; Aji, Adha Sukma; Okada, Susumu; Matsuda, Kazunari; Ago, Hiroki.

In: Physical Chemistry Chemical Physics, Vol. 20, No. 47, 01.01.2018, p. 29790-29797.

Research output: Contribution to journalArticle

Ji, Hyun Goo ; Maruyama, Mina ; Aji, Adha Sukma ; Okada, Susumu ; Matsuda, Kazunari ; Ago, Hiroki. / Van der Waals interaction-induced photoluminescence weakening and multilayer growth in epitaxially aligned WS 2 In: Physical Chemistry Chemical Physics. 2018 ; Vol. 20, No. 47. pp. 29790-29797.
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