Blueshift of the A-exciton peak in folded monolayer 1H-MoS2

Frank J. Crowne; Matin Amani; A. Glen Birdwell; Matthew L. Chin; Terrance P. O'Regan; Sina Najmaei; Zheng Liu; Pulickel M. Ajayan; Jun Lou; Madan Dubey

doi:10.1103/PhysRevB.88.235302

Blueshift of the A-exciton peak in folded monolayer 1H-MoS₂

Frank J. Crowne^*, Matin Amani, A. Glen Birdwell, Matthew L. Chin, Terrance P. O'Regan, Sina Najmaei, Zheng Liu, Pulickel M. Ajayan, Jun Lou, Madan Dubey

^*Corresponding author for this work

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

39 Citations (Scopus)

Abstract

The large family of layered transition-metal dichalcogenides is widely believed to constitute a second family of two-dimensional (2D) semiconducting materials that can be used to create novel devices that complement those based on graphene. In many cases these materials have shown a transition from an indirect band gap in the bulk to a direct band gap in monolayer systems. In this work we experimentally show that folding a 1H molybdenum disulfide (MoS ₂) layer results in a turbostratic stack with enhanced photoluminescence quantum yield and a significant shift to the blue by ∼90 meV. This is in contrast to the expected 2H-MoS₂ band-structure characteristics, which include an indirect gap and quenched photoluminescence. We present a theoretical explanation for the origin of this behavior in terms of exciton screening.

Original language	English
Article number	235302
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	88
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevB.88.235302
Publication status	Published - Dec 6 2013
Externally published	Yes

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.88.235302

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title = "Blueshift of the A-exciton peak in folded monolayer 1H-MoS2",

abstract = "The large family of layered transition-metal dichalcogenides is widely believed to constitute a second family of two-dimensional (2D) semiconducting materials that can be used to create novel devices that complement those based on graphene. In many cases these materials have shown a transition from an indirect band gap in the bulk to a direct band gap in monolayer systems. In this work we experimentally show that folding a 1H molybdenum disulfide (MoS 2) layer results in a turbostratic stack with enhanced photoluminescence quantum yield and a significant shift to the blue by ∼90 meV. This is in contrast to the expected 2H-MoS2 band-structure characteristics, which include an indirect gap and quenched photoluminescence. We present a theoretical explanation for the origin of this behavior in terms of exciton screening.",

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AU - Crowne, Frank J.

AU - Amani, Matin

AU - Birdwell, A. Glen

AU - Chin, Matthew L.

AU - O'Regan, Terrance P.

AU - Najmaei, Sina

AU - Liu, Zheng

AU - Ajayan, Pulickel M.

AU - Lou, Jun

AU - Dubey, Madan

PY - 2013/12/6

Y1 - 2013/12/6

N2 - The large family of layered transition-metal dichalcogenides is widely believed to constitute a second family of two-dimensional (2D) semiconducting materials that can be used to create novel devices that complement those based on graphene. In many cases these materials have shown a transition from an indirect band gap in the bulk to a direct band gap in monolayer systems. In this work we experimentally show that folding a 1H molybdenum disulfide (MoS 2) layer results in a turbostratic stack with enhanced photoluminescence quantum yield and a significant shift to the blue by ∼90 meV. This is in contrast to the expected 2H-MoS2 band-structure characteristics, which include an indirect gap and quenched photoluminescence. We present a theoretical explanation for the origin of this behavior in terms of exciton screening.

AB - The large family of layered transition-metal dichalcogenides is widely believed to constitute a second family of two-dimensional (2D) semiconducting materials that can be used to create novel devices that complement those based on graphene. In many cases these materials have shown a transition from an indirect band gap in the bulk to a direct band gap in monolayer systems. In this work we experimentally show that folding a 1H molybdenum disulfide (MoS 2) layer results in a turbostratic stack with enhanced photoluminescence quantum yield and a significant shift to the blue by ∼90 meV. This is in contrast to the expected 2H-MoS2 band-structure characteristics, which include an indirect gap and quenched photoluminescence. We present a theoretical explanation for the origin of this behavior in terms of exciton screening.

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Blueshift of the A-exciton peak in folded monolayer 1H-MoS₂

Abstract

ASJC Scopus Subject Areas

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