Atom-Dependent Edge-Enhanced Second-Harmonic Generation on MoS2 Monolayers

Kuang I. Lin; Yen Hung Ho; Shu Bai Liu; Jian Jhih Ciou; Bo Ting Huang; Christopher Chen; Han Ching Chang; Chien Liang Tu; Chang Hsiao Chen

doi:10.1021/acs.nanolett.7b04006

Atom-Dependent Edge-Enhanced Second-Harmonic Generation on MoS₂ Monolayers

Kuang I. Lin, Yen Hung Ho, Shu Bai Liu, Jian Jhih Ciou, Bo Ting Huang, Christopher Chen, Han Ching Chang, Chien Liang Tu, Chang Hsiao Chen

Education and Research Group

Research output: Contribution to journal › Article › peer-review

37 Citations (Scopus)

Abstract

Edge morphology and lattice orientation of single-crystal molybdenum disulfide (MoS₂) monolayers, a transition metal dichalcogenide (TMD), possessing a triangular shape with different edges grown by chemical vapor deposition are characterized by atomic force microscopy and transmission electron microscopy. Multiphoton laser scanning microscopy is utilized to study one-dimensional atomic edges of MoS₂ monolayers with localized midgap electronic states, which result in greatly enhanced optical second-harmonic generation (SHG). Microscopic S-zigzag edge and S-Mo Klein edge (bare Mo atoms protruding from a S-zigzag edge) terminations and the edge-atom dependent resonance energies can therefore be deduced based on SHG images. Theoretical calculations based on density functional theory clearly explain the lower energy of the S-zigzag edge states compared to the corresponding S-Mo Klein edge states. Characterization of the atomic-scale variation of edge-enhanced SHG is a step forward in this full-optical and high-yield technique of atomic-layer TMDs.

Original language	English
Pages (from-to)	793-797
Number of pages	5
Journal	Nano letters
Volume	18
Issue number	2
DOIs	https://doi.org/10.1021/acs.nanolett.7b04006
Publication status	Published - 2018 Feb 14

All Science Journal Classification (ASJC) codes

Bioengineering
Chemistry(all)
Materials Science(all)
Condensed Matter Physics
Mechanical Engineering

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10.1021/acs.nanolett.7b04006

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title = "Atom-Dependent Edge-Enhanced Second-Harmonic Generation on MoS2 Monolayers",

abstract = "Edge morphology and lattice orientation of single-crystal molybdenum disulfide (MoS2) monolayers, a transition metal dichalcogenide (TMD), possessing a triangular shape with different edges grown by chemical vapor deposition are characterized by atomic force microscopy and transmission electron microscopy. Multiphoton laser scanning microscopy is utilized to study one-dimensional atomic edges of MoS2 monolayers with localized midgap electronic states, which result in greatly enhanced optical second-harmonic generation (SHG). Microscopic S-zigzag edge and S-Mo Klein edge (bare Mo atoms protruding from a S-zigzag edge) terminations and the edge-atom dependent resonance energies can therefore be deduced based on SHG images. Theoretical calculations based on density functional theory clearly explain the lower energy of the S-zigzag edge states compared to the corresponding S-Mo Klein edge states. Characterization of the atomic-scale variation of edge-enhanced SHG is a step forward in this full-optical and high-yield technique of atomic-layer TMDs.",

author = "Lin, {Kuang I.} and Ho, {Yen Hung} and Liu, {Shu Bai} and Ciou, {Jian Jhih} and Huang, {Bo Ting} and Christopher Chen and Chang, {Han Ching} and Tu, {Chien Liang} and Chen, {Chang Hsiao}",

note = "Funding Information: This research was supported by the Ministry of Education, Taiwan, R.O.C. The Aim for the Top University Project to the National Cheng Kung University. The synthesis of the material was supported by the Ministry of Science and Technology, MOST104-2218-E-035-010, MOST104-2628-E-035-002-MY3, and MOST106-2221-E-035-088-MY3. Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

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AU - Lin, Kuang I.

AU - Ho, Yen Hung

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AU - Ciou, Jian Jhih

AU - Huang, Bo Ting

AU - Chen, Christopher

AU - Chang, Han Ching

AU - Tu, Chien Liang

AU - Chen, Chang Hsiao

N1 - Funding Information: This research was supported by the Ministry of Education, Taiwan, R.O.C. The Aim for the Top University Project to the National Cheng Kung University. The synthesis of the material was supported by the Ministry of Science and Technology, MOST104-2218-E-035-010, MOST104-2628-E-035-002-MY3, and MOST106-2221-E-035-088-MY3. Publisher Copyright: © 2018 American Chemical Society.

PY - 2018/2/14

Y1 - 2018/2/14

N2 - Edge morphology and lattice orientation of single-crystal molybdenum disulfide (MoS2) monolayers, a transition metal dichalcogenide (TMD), possessing a triangular shape with different edges grown by chemical vapor deposition are characterized by atomic force microscopy and transmission electron microscopy. Multiphoton laser scanning microscopy is utilized to study one-dimensional atomic edges of MoS2 monolayers with localized midgap electronic states, which result in greatly enhanced optical second-harmonic generation (SHG). Microscopic S-zigzag edge and S-Mo Klein edge (bare Mo atoms protruding from a S-zigzag edge) terminations and the edge-atom dependent resonance energies can therefore be deduced based on SHG images. Theoretical calculations based on density functional theory clearly explain the lower energy of the S-zigzag edge states compared to the corresponding S-Mo Klein edge states. Characterization of the atomic-scale variation of edge-enhanced SHG is a step forward in this full-optical and high-yield technique of atomic-layer TMDs.

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Atom-Dependent Edge-Enhanced Second-Harmonic Generation on MoS₂ Monolayers

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