Extraordinary Temperature Dependent Second Harmonic Generation in Atomically Thin Layers of Transition‐Metal Dichalcogenides

Khan, Amir; Liu, Boqing; Zhang, Linglong; Zhu, Yi; He, Xin; Zhang, Lijun; Lü, Tie-Yu; Lu, Yuerui

doi:10.1002/adom.202000441

Cited by 35 publications

(34 citation statements)

References 71 publications

(76 reference statements)

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“…[ 24,25 ] In particular, the past decade has shown tremendous success in expanding the 2D materials family, and demonstrating their potential nanotechnological applications. Indeed, fundamental characteristics of many 2D materials have shown promising optical, [ 26,27 ] electrical, [ 28,29 ] optoelectronic, [ 11,30 ] magnetic, [ 31,32 ] mechatronic, and optomechatronic properties, [ 33 ] at the 1D/2D quantum limit. The electron confinement in ultrathin 2D nanomaterials makes them appealing candidates for fundamental condensed matter investigations and for electronic device applications.…”

Section: Introductionmentioning

confidence: 99%

Retracted: Emerging 2D MXene/Organic Heterostructures for Future Nanodevices

Neupane

Yildirim

Zhang

et al. 2020

Adv Funct Materials

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MXenes are a rapidly growing family of 2D materials. Their unique combination of metallic conductivity, hydrophilicity, and highly charged surfaces endow them with excellent electrochemical performance. Appropriate surface functional groups determine their semiconducting properties. The wide selection of various MXene structures and surface functional groups enable tunable work functions and bandgaps, making them prime candidates for many optoelectronic applications. In addition, the discovery of 2D organic semiconductors having single molecular thickness has also greatly attracted research attention due to their optical, electronic, optoelectronic, and mechatronic properties. Moreover, the formation of MXenes/organic 2D heterostructures enables many interesting phenomena in the 2D quantum limit to be observed. This review aims to increase motivation toward the investigation of newly emerging MXenes, 2D organic materials, and their combinational heterostructures. It overviews recent progress in the fundamental investigations of the optical, electronic, and optoelectronic properties in isolated 2D MXenes and organic materials; then, highlights the major importance of 2D MXene/organic heterostructures for applications in exciton-polariton lasers, light emitting devices, wearable electronics, and spintronic devices. The review aims outlines a future roadmap for 2D MXenes, organic materials, and their heterostructures for advanced nanotechnology applications.

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Section: Introductionmentioning

confidence: 99%

Retracted: Emerging 2D MXene/Organic Heterostructures for Future Nanodevices

Neupane

Yildirim

Zhang

et al. 2020

Adv Funct Materials

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“…For example, T of approximately 3 min was required until the ablation at F = 28 mJ/cm 2 . The gradual increase in the SHG signal reflects the increase in the lattice temperature because it is known that SHG increases with temperature [41]. The rapid SHG imaging can be used to visualize laser-induced ablation in situ under illumination by a strong femtosecond laser.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

High-Speed Imaging of Second-Harmonic Generation in MoS2 Bilayer under Femtosecond Laser Ablation

et al. 2021

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We report an in situ characterization of transition-metal dichalcogenide (TMD) monolayers and twisted bilayers using a high-speed second-harmonic generation (SHG) imaging technique. High-frequency laser modulation and galvano scanning in the SHG imaging enabled a rapid identification of the crystallinity in the TMD, including the orientation and homogeneity with a speed of 1 frame/s. For a twisted bilayer MoS2, we studied the SHG peak intensity and angles as a function of the twist angle under a strong interlayer coupling. In addition, rapid SHG imaging can be used to visualize laser-induced ablation of monolayer and bilayer MoS2 in situ under illumination by a strong femtosecond laser. Importantly, we observed a characteristic threshold behavior; the ablation process occurred for a very short time duration once the preheating condition was reached. We investigated the laser thinning of the bilayer MoS2 with different twist angles. When the twist angle was 0°, the SHG decreased by approximately one-fourth of the initial intensity when one layer was removed. Conversely, when the twist angle was approximately 60° (the SHG intensity was suppressed), the SHG increased abruptly close to that of the nearby monolayer when one layer was removed. Precise layer-by-layer control was possible because of the unique threshold behavior of the laser-induced ablation.

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“…[58] In the past decade, a majority of 2D ultrathin materials involving transition metal dichalcogenides (TMDs, e.g., MoS 2 , MoSe 2 , WSe 2 , WS 2 , TiS 2 , TaS 2 , etc. ), [49,[59][60][61] BN, [21][22][23][24][25][26]35,[62][63][64][65][66][67][68][69][70][71] BP, [72][73][74][75][76][77][78][79][80][81][82][83][84] 2D organic crystals (e.g., 2D small molecular and polymers), [85][86][87][88][89][90][91][92][93][94][95] 2D perovskites, [96][97][98][99]…”

Section: Ambient-pressure Structure and Propertiesmentioning

confidence: 99%

2D Materials and Heterostructures at Extreme Pressure

et al. 2020

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2D materials possess wide-tuning properties ranging from semiconducting and metallization to superconducting, etc., which are determined by their structure, empowering them to be appealing in optoelectronic and photovoltaic applications. Pressure is an effective and clean tool that allows modifications of the electronic structure, crystal structure, morphologies, and compositions of 2D materials through van der Waals (vdW) interaction engineering. This enables an insightful understanding of the variable vdW interaction induced structural changes, structure-property relations as well as contributes to the versatile implications of 2D materials. Here, the recent progress of high-pressure research toward 2D materials and heterostructures, involving graphene, boron nitride, transition metal dichalcogenides, 2D perovskites, black phosphorene, MXene, and covalent-organic frameworks, using diamond anvil cell is summarized. A detailed analysis of pressurized structure, phonon dynamics, superconducting, metallization, doping together with optical property is performed. Further, the pressure-induced optimized properties and potential applications as well as the vision of engineering the vdW interactions in heterostructures are highlighted. Finally, conclusions and outlook are presented on the way forward.

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Extraordinary Temperature Dependent Second Harmonic Generation in Atomically Thin Layers of Transition‐Metal Dichalcogenides

Cited by 35 publications

References 71 publications

Retracted: Emerging 2D MXene/Organic Heterostructures for Future Nanodevices

Retracted: Emerging 2D MXene/Organic Heterostructures for Future Nanodevices

High-Speed Imaging of Second-Harmonic Generation in MoS2 Bilayer under Femtosecond Laser Ablation

2D Materials and Heterostructures at Extreme Pressure

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