Probing the interlayer coupling of twisted bilayer MoS2 using photoluminescence spectroscopy

Shengxi Huang; Xi Ling; Liangbo Liang; Jing Kong; Humberto Terrones; Vincent Meunier; Mildred S. Dresselhaus

doi:10.1021/nl5014597

Probing the interlayer coupling of twisted bilayer MoS₂ using photoluminescence spectroscopy

Shengxi Huang, Xi Ling, Liangbo Liang, Jing Kong, Humberto Terrones, Vincent Meunier, Mildred S. Dresselhaus

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

239 Scopus citations

Abstract

Two-dimensional molybdenum disulfide (MoS₂) is a promising material for optoelectronic devices due to its strong photoluminescence emission. In this work, the photoluminescence of twisted bilayer MoS₂ is investigated, revealing a tunability of the interlayer coupling of bilayer MoS₂. It is found that the photoluminescence intensity ratio of the trion and exciton reaches its maximum value for the twisted angle 0° or 60°, while for the twisted angle 30° or 90° the situation is the opposite. This is mainly attributed to the change of the trion binding energy. The first-principles density functional theory analysis further confirms the change of the interlayer coupling with the twisted angle, which interprets our experimental results.

Original language	English (US)
Pages (from-to)	5500-5508
Number of pages	9
Journal	Nano letters
Volume	14
Issue number	10
DOIs	https://doi.org/10.1021/nl5014597
State	Published - Oct 8 2014

All Science Journal Classification (ASJC) codes

Bioengineering
General Chemistry
General Materials Science
Condensed Matter Physics
Mechanical Engineering

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title = "Probing the interlayer coupling of twisted bilayer MoS2 using photoluminescence spectroscopy",

abstract = "Two-dimensional molybdenum disulfide (MoS2) is a promising material for optoelectronic devices due to its strong photoluminescence emission. In this work, the photoluminescence of twisted bilayer MoS2 is investigated, revealing a tunability of the interlayer coupling of bilayer MoS2. It is found that the photoluminescence intensity ratio of the trion and exciton reaches its maximum value for the twisted angle 0° or 60°, while for the twisted angle 30° or 90° the situation is the opposite. This is mainly attributed to the change of the trion binding energy. The first-principles density functional theory analysis further confirms the change of the interlayer coupling with the twisted angle, which interprets our experimental results.",

author = "Shengxi Huang and Xi Ling and Liangbo Liang and Jing Kong and Humberto Terrones and Vincent Meunier and Dresselhaus, {Mildred S.}",

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T1 - Probing the interlayer coupling of twisted bilayer MoS2 using photoluminescence spectroscopy

AU - Huang, Shengxi

AU - Ling, Xi

AU - Liang, Liangbo

AU - Kong, Jing

AU - Terrones, Humberto

AU - Meunier, Vincent

AU - Dresselhaus, Mildred S.

PY - 2014/10/8

Y1 - 2014/10/8

N2 - Two-dimensional molybdenum disulfide (MoS2) is a promising material for optoelectronic devices due to its strong photoluminescence emission. In this work, the photoluminescence of twisted bilayer MoS2 is investigated, revealing a tunability of the interlayer coupling of bilayer MoS2. It is found that the photoluminescence intensity ratio of the trion and exciton reaches its maximum value for the twisted angle 0° or 60°, while for the twisted angle 30° or 90° the situation is the opposite. This is mainly attributed to the change of the trion binding energy. The first-principles density functional theory analysis further confirms the change of the interlayer coupling with the twisted angle, which interprets our experimental results.

AB - Two-dimensional molybdenum disulfide (MoS2) is a promising material for optoelectronic devices due to its strong photoluminescence emission. In this work, the photoluminescence of twisted bilayer MoS2 is investigated, revealing a tunability of the interlayer coupling of bilayer MoS2. It is found that the photoluminescence intensity ratio of the trion and exciton reaches its maximum value for the twisted angle 0° or 60°, while for the twisted angle 30° or 90° the situation is the opposite. This is mainly attributed to the change of the trion binding energy. The first-principles density functional theory analysis further confirms the change of the interlayer coupling with the twisted angle, which interprets our experimental results.

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Probing the interlayer coupling of twisted bilayer MoS₂ using photoluminescence spectroscopy

Abstract

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