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Indirect Band Gap in Scrolled MoS₂ Monolayers.

Jeonghyeon Na¹, Changyeon Park¹, Chang Hoi Lee¹

¹School of Physics, Konkuk University, Seoul 05029, Korea.

Nanomaterials (Basel, Switzerland)

|October 14, 2022

Summary

Researchers created molybdenum disulfide (MoS₂) nanoscrolls from monolayers. These nanoscrolls exhibit tunable band gaps, shifting from direct to indirect, offering new possibilities for 2D material applications.

Keywords:

1D structure MoS2 band gap ionic liquid gating rolled structure scrolled MoS2

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Published on: October 12, 2019

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Molybdenum disulfide (MoS₂) is a 2D material with tunable electronic properties.
Modifying the structure of 2D materials, such as rolling them into scrolls, can alter their band gaps.

Purpose of the Study:

To investigate the optical and transport band gaps of MoS₂ nanoscrolls.
To understand how the scrolling process affects the electronic properties of MoS₂ monolayers.
To explore MoS₂ nanoscrolls as quasi-1D nanostructures.

Main Methods:

Generation of MoS₂ nanoscrolls from MoS₂ monolayers with inner core radii of approximately 250 nm.
Photoluminescence spectroscopy to determine optical band gaps.
Transport measurements using ambipolar ionic-liquid-gated transistors to determine transport band gaps.

Main Results:

MoS₂ monolayers, initially direct gap semiconductors (~1.85 eV), transition to indirect gap semiconductors (~1.6 eV) upon scrolling.
The indirect band gap of MoS₂ nanoscrolls (~1.6 eV) is larger than that of MoS₂ bilayers (~1.54 eV), suggesting weaker interlayer interactions.
Transport measurements revealed a band gap of approximately 1.9 eV for the nanoscrolls.
An exciton binding energy of 0.3 eV was determined for the MoS₂ nanoscrolls.

Conclusions:

Rolling 2D MoS₂ atomic layers into nanoscrolls creates novel quasi-1D nanostructures.
The scrolling process significantly modifies the band gap of MoS₂, offering a new method for tuning electronic properties of 2D materials.