Strain engineering in single-, bi- and tri-layer MoS2, MoSe2, WS2 and WSe2

Carrascoso, Félix; Li, Hao; Frisenda, Riccardo; Castellanos-Gómez, Andrés

doi:10.1007/s12274-020-2918-2

Cited by 78 publications

(99 citation statements)

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“…[7] However, the exciton peaks can be significantly redshifted due to the strain-induced reduction of bandgap in 1L MoS 2 as revealed in previous reports. [34,[36][37][38][39][40][41][42] Compared with the traditional SiO 2 /Si substrate and transparent quartz substrate, the novel Au film substrate can provide large strain, which has also been confirmed by our subsequent Raman and differential reflectance measurements. Therefore, this insignificant peak shift may be the result of the competition between the quantum confinement effect and the strain-induced bandgap engineering.…”

Section: Resultssupporting

confidence: 66%

“…Therefore, this insignificant peak shift may be the result of the competition between the quantum confinement effect and the strain-induced bandgap engineering. In addition, it should be noted that the physical origins of the C, D, E excitons with higher energy are more complex in respect to the A and B excitons and such high energies also bring difficulties to experimental measurement to a certain extent, [36,40] which prevents them from being widely studied. Thus, it may be difficult to fully understand the influence of the novel metal substrate that can not only provide large strain but also promote interlayer charge transfer on the highfrequency dielectric response of TMDC monolayers with a strong excitonic effect.…”

Section: Resultsmentioning

confidence: 99%

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Spectroscopic Ellipsometry Investigation of Au‐Assisted Exfoliated Large‐Area Single‐Crystalline Monolayer MoS₂

Zou

Zhang

et al. 2021

Physica Rapid Research Ltrs

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The recent Au‐assisted mechanical exfoliation technique has enabled scalable fabrication of millimeter‐sized, high‐quality monolayer 2D crystals. Herein, spectroscopic ellipsometry characterization of as‐exfoliated single‐crystalline monolayer MoS2 is reported. By developing layer‐by‐layer ellipsometry measurements and analysis, the complex dielectric function of monolayer MoS2 is extracted. Compared with bulk MoS2, the A and B exciton peaks in the dielectric function spectrum nearly disappear in the 1L MoS2–Au hybrid system. The charge transfer at the 1L MoS2–Au interface is responsible for this observation and the conclusion is also supported by Raman, photoluminescence, and differential reflectance measurements. These results reveal the impact of the Au substrate on the dielectric response of 2D monolayers with strong excitonic effect and will deepen our understanding of the 1L MoS2–Au interaction.

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Section: Resultssupporting

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Spectroscopic Ellipsometry Investigation of Au‐Assisted Exfoliated Large‐Area Single‐Crystalline Monolayer MoS₂

Zou

Zhang

et al. 2021

Physica Rapid Research Ltrs

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“…Among the different strategies to strain engineer 2D materials, the application of uniaxial strain through bending flexible substrates with a bending jig apparatus is one of the most popular approaches. [1,11,12,[15][16][17][18] This method presents some issues when applied to 2D materials with in-plane anisotropic properties. Indeed, the effect of uniaxial strain along different crystal orientations is expected to modify the properties of these anisotropic 2Ds differently.…”

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confidence: 99%

Strongly Anisotropic Strain‐Tunability of Excitons in Exfoliated ZrSe₃

Sánchez-Santolino

Puebla

et al. 2021

Advanced Materials

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be adjusted by the end-user at will. Strain engineering in conventional 3D materials, in contrast, typically relies on forcing the epitaxial growth of a material onto a substrate with a given lattice parameter mismatch, providing a fixed strain that cannot be adjusted after growth. Among the different strategies to strain engineer 2D materials, the application of uniaxial strain through bending flexible substrates with a bending jig apparatus is one of the most popular approaches. [1,11,12,[15][16][17][18] This method presents some issues when applied to 2D materials with in-plane anisotropic properties. Indeed, the effect of uniaxial strain along different crystal orientations is expected to modify the properties of these anisotropic 2Ds differently. Despite the recent interest on these families of anisotropic 2D materials, [19][20][21][22][23][24][25][26] the number of reported research works focused on studying the effect of strain along different crystal directions is still very scarce and primarily focused on the investigation of strain tunable Raman modes in black phosphorus, PdSe 2 , or tellurium. [27][28][29][30][31] The group IV-V transition metal trichalcogenides (TMTCs) are a less-explored family of materials with quasi-1D electrical and optical properties stemming from a reduced in-plane structural symmetry. [24,[32][33][34] These materials have a general formula of MX 3 being M a transition metal atomThe effect of uniaxial strain on the band structure of ZrSe 3 , a semiconducting material with a marked in-plane structural anisotropy, is studied. By using a modified three-point bending test apparatus, thin ZrSe 3 flakes are subjected to uniaxial strain along different crystalline orientations monitoring the effect of strain on their optical properties through micro-reflectance spectroscopy. The obtained spectra show excitonic features that blueshift upon uniaxial tension. This shift is strongly dependent on the direction along which the strain is being applied. When the flakes are strained along the b-axis, the exciton peak shifts at ≈60-95 meV % −1 , while along the a-axis, the shift only reaches ≈0-15 meV % −1 . Ab initio calculations are conducted to study the influence of uniaxial strain, applied along different crystal directions, on the band structure and reflectance spectra of ZrSe 3 , exhibiting a remarkable agreement with the experimental results.

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“…Strain engineering offers another attractive strategy to tailor the physical properties of 2D materials. In an original research article, Andres Castellanos-Gomez from Consejo Superior de Investigaciones Científicas reports a systematic study on how uniaxial strain modifies the optical properties of single-, bi-and tri-layer TMDs [10]. Retaining the structural and electronic stability of 2D materials is essential for practical applications.…”

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confidence: 99%

The Nano Research Young Innovators (NR45) Awards in two-dimensional materials

Duan

Xiong

2021

Nano Res.

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Nano Research launched the Nano Research Young Innovator Awards (NR45) program in 2018 to feature young researchers under the age of 45 in various fields of nanoscience and nanotechnology, in recognition of their distinguished accomplishments and/or potential to make substantial contributions to their fields. The NR45 awardees were selected through a competitive process by an award committee from the journal's editorial board. The 2021 NR45 Awards focus on the topic area of two-dimensional (2D) materials, and highlight 35 innovators in cognitions of their extraordinary contributions to this rapidly expanding field. Congratulations to all the 35 outstanding young innovators!The discovery of graphene has ignited intensive interest in 2D materials. In general, there is a large family of layered materials, in which the atomic layers are weakly bonded together by van der Waals interactions. The 2D materials can be readily prepared from the corresponding layered crystals through a micromechanical exfoliation approach, which has fueled the rapid expansion of 2D material research. However, such mechanical exfoliation approach is intrinsically unsuitable for practical technologies and it is imperative to develop more scalable synthetic strategies to 2D materials over large area or in large quantity. This special issue starts with a comprehensive review by Bilu Liu from Tsinghua University on the mass production of 2D materials beyond graphene, including "top-down" exfoliation and "bottom-up" synthetic approaches [1]. Next, Guangyu Zhang from Institute of Physics, Chinese Academy of Science highlights specifically on the large area epitaxial growth of high-quality continuous monolayer MoS2 films [2]. Lei Fu from Wuhan University reviews a space-confined method for the growth of perovskite crystal film with controlled size, thickness, quality and structure [3]. Kai Xiao from Oak Ridge National Laboratory provides a focused review of controlled synthesis and processing of heterogeneities at multiple length scales and their impact on the macroscale properties and functionalities of 2D materials [4]. Litao Sun from Southeast University reviews the in-situ transmission electron microscopy (TEM) studies probing the nucleation and formation of 2D crystals [5]. Liying Jiao from Tsinghua University then presents a research article on fast growth of single crystalline WS2 monolayer domains [6], and Shuyun Zhou from Tsinghua University reports a large-scale growth of PtTe, PtTe2 and PSe2 thin film via straightforward selenization or tellurization of deposited Pt films [7].

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Strain engineering in single-, bi- and tri-layer MoS2, MoSe2, WS2 and WSe2

Cited by 78 publications

References 40 publications

Spectroscopic Ellipsometry Investigation of Au‐Assisted Exfoliated Large‐Area Single‐Crystalline Monolayer MoS₂

Spectroscopic Ellipsometry Investigation of Au‐Assisted Exfoliated Large‐Area Single‐Crystalline Monolayer MoS₂

Strongly Anisotropic Strain‐Tunability of Excitons in Exfoliated ZrSe₃

The Nano Research Young Innovators (NR45) Awards in two-dimensional materials

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Strain engineering in single-, bi- and tri-layer MoS2, MoSe2, WS2 and WSe2

Cited by 78 publications

References 40 publications

Spectroscopic Ellipsometry Investigation of Au‐Assisted Exfoliated Large‐Area Single‐Crystalline Monolayer MoS2

Spectroscopic Ellipsometry Investigation of Au‐Assisted Exfoliated Large‐Area Single‐Crystalline Monolayer MoS2

Strongly Anisotropic Strain‐Tunability of Excitons in Exfoliated ZrSe3

The Nano Research Young Innovators (NR45) Awards in two-dimensional materials

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Spectroscopic Ellipsometry Investigation of Au‐Assisted Exfoliated Large‐Area Single‐Crystalline Monolayer MoS₂

Spectroscopic Ellipsometry Investigation of Au‐Assisted Exfoliated Large‐Area Single‐Crystalline Monolayer MoS₂

Strongly Anisotropic Strain‐Tunability of Excitons in Exfoliated ZrSe₃