Substrate mediated electronic and excitonic reconstruction in a MoS<sub>2</sub> monolayer

Yang, Yu‐Lin; Song, Ting; Zhang, Xiaoman; Zhao, Yifei; Chai, Jingshan; Cheng, Zaijun; Huang, Xiaohua; Zhang, Hongyi; Zhu, Wen‐Zhang; Yang, Ming

doi:10.1039/c9tc05881h

Cited by 24 publications

(25 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5, MoS 2 has a peak near 600 nm when without SOC, which is consistent with the previously reported lowest exciton jump energy of MoS 2 of around 2 eV. 52 After considering SOC, the optical bandgap becomes smaller and the first peak appears at about 1.9 eV, which corresponds to the peak larger than 600 nm in this figure. After considering SOC, the lowest excitonic state of 2D MoGe 2 P 4 is located at around 770 nm.…”

Section: Optical Absorption Propertiessupporting

confidence: 91%

Prediction of a new two-dimensional valleytronic semiconductor MoGe₂P₄ with large valley spin splitting

Liu

Lan

et al. 2022

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

Section: Optical Absorption Propertiessupporting

confidence: 91%

Prediction of a new two-dimensional valleytronic semiconductor MoGe₂P₄ with large valley spin splitting

Liu

Lan

et al. 2022

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…In order to obtain the improved toughness and the decreased processing temperature, a large amount of suitable plasticizer needs to be added into PLA polymer matrix. During the last decade, the production of plasticizers was around 6.4 million tons all over the world per year, it was estimated that more than 13.2 million tons per year in 2018 . Unfortunately, most plasticizers are difficult to degrade in natural environment and easy to migrate due to their high mobility within the PLA matrix .…”

Section: Introductionmentioning

confidence: 99%

Effect of polyethylene glycol on mechanical properties of bamboo fiber‐reinforced polylactic acid composites

Long

Dong

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

The bamboo fiber (BF)-reinforced polylactic acid (PLA) composites were prepared using the twin-screw extruder and injection molding. Thermal gravimetric analyzer results indicated the thermal stability of BF/PLA composites decreased with increasing BF content. Differential scanning calorimeter and X-ray diffraction curves showed that BF played a role as a nucleating agent, but the crystallinity of composite materials decreased with the increasing BF content. The melt flow rate of composites reduced with the increase in BF content, resulting in a poorer processing property. The processability of the composites was improved with the addition of high molecular polyethylene glycol (PEG). Mechanics performance test showed that tensile strength and bending strength of composites increased at low loading with the BF content increased then decreased when the loading continued to increase. The tensile strength of the composite materials reached 65.46 MPa when alkali-treated BF (ABF) content was 20 wt %. The flexural strength of the composites reached 97.94 MPa when ABF content was 10 wt %. Impact performance has also been improved. PEG-20000 was the best plasticizer among the PEG-6000，PEG-10000, and PEG-20000. When the component of PEG was 10 wt %, the elongation increased by 56%. The scanning electron microscopy (SEM) result showed that the fracture of the composites was smooth, most ABF were wrapped in matrix and distribution of ABF in PLA matrix was more uniform. It means that interfacial compatibility of bamboo fiber and PLA improved after BF modified by alkali. High molecular weight PEG enhance melt flow ability of polymer, result in fibers were further enclosed in the PLA matrix and increase properties of composites.

show abstract

“…For instance, recent studies demonstrated that substrate has an important screening effect that reduces the electron−hole interaction. 74,75 Therefore, the screening from MoS 2 may also reduce the electron− hole recombination rate in the ReSe 2 /MoS 2 heterostructure.…”

mentioning

confidence: 99%

“…Furthermore, in 2D semiconductor materials, the strong exciton effect usually exists due to quantum confinement and reduced dielectric screening, and the exciton binding energy is susceptible to the external influences. For instance, recent studies demonstrated that substrate has an important screening effect that reduces the electron–hole interaction. , Therefore, the screening from MoS 2 may also reduce the electron–hole recombination rate in the ReSe 2 /MoS 2 heterostructure.…”

mentioning

confidence: 99%

Time-Domain Ab Initio Insights into the Reduced Nonradiative Electron–Hole Recombination in ReSe₂/MoS₂ van der Waals Heterostructure

Dou

Jia

Hao

et al. 2021

J. Phys. Chem. Lett.

View full text Add to dashboard Cite

Two-dimensional (2D) ReSe2 has attracted considerable interest due to its unique anisotropic mechanical, optical, and exitonic characteristics. Recent transient absorption experiments demonstrated a prolonged lifetime of photoexcited charge carriers by stacking ReSe2 with MoS2, but the underlying mechanism remains elusive. Here, by combining time-domain density functional theory with nonadiabatic molecular dynamics, we investigate the electronic properties and charge carrier dynamics of 2D ReSe2/MoS2 van der Waals (vdW) heterostructure. ReSe2/MoS2 has a type II band alignment that exhibits spatially distinguished conduction and valence band edges, and a built-in electric field is formed due to interface charge transfer. Remarkably, in spite of the decreased band gap and increased decoherence time, we demonstrate that the photocarrier lifetime of ReSe2/MoS2 is ∼5 times longer than that of ReSe2, which originates from the greatly reduced nonadiabatic coupling that suppresses electron–hole recombination, perfectly explaining the experimental results. These findings not only provide physical insights into experiments but also shed light on future design and fabrication of functional optoelectronic devices based on 2D vdW heterostructures.

show abstract

Substrate mediated electronic and excitonic reconstruction in a MoS₂ monolayer

Abstract: The atomically thickness of two-dimensional materials (2D) makes their physical and chemical properties vulnerable to external influence. In this study, we show that the electronic and optical properties of MoS2...

Cited by 24 publications

References 64 publications

Prediction of a new two-dimensional valleytronic semiconductor MoGe₂P₄ with large valley spin splitting

Prediction of a new two-dimensional valleytronic semiconductor MoGe₂P₄ with large valley spin splitting

Effect of polyethylene glycol on mechanical properties of bamboo fiber‐reinforced polylactic acid composites

Time-Domain Ab Initio Insights into the Reduced Nonradiative Electron–Hole Recombination in ReSe₂/MoS₂ van der Waals Heterostructure

Contact Info

Product

Resources

About

Substrate mediated electronic and excitonic reconstruction in a MoS2 monolayer

Abstract: The atomically thickness of two-dimensional materials (2D) makes their physical and chemical properties vulnerable to external influence. In this study, we show that the electronic and optical properties of MoS2...

Cited by 24 publications

References 64 publications

Prediction of a new two-dimensional valleytronic semiconductor MoGe2P4 with large valley spin splitting

Prediction of a new two-dimensional valleytronic semiconductor MoGe2P4 with large valley spin splitting

Effect of polyethylene glycol on mechanical properties of bamboo fiber‐reinforced polylactic acid composites

Time-Domain Ab Initio Insights into the Reduced Nonradiative Electron–Hole Recombination in ReSe2/MoS2 van der Waals Heterostructure

Contact Info

Product

Resources

About

Substrate mediated electronic and excitonic reconstruction in a MoS₂ monolayer

Prediction of a new two-dimensional valleytronic semiconductor MoGe₂P₄ with large valley spin splitting

Prediction of a new two-dimensional valleytronic semiconductor MoGe₂P₄ with large valley spin splitting

Time-Domain Ab Initio Insights into the Reduced Nonradiative Electron–Hole Recombination in ReSe₂/MoS₂ van der Waals Heterostructure