Predicting two-dimensional topological phases in Janus materials by substitutional doping in transition metal dichalcogenide monolayers

Maghirang, Aniceto B.; Huang, Zhi-Quan; Villaos, Rovi Angelo B.; Hsu, Chia-Hsiu; Feng, Liang-Ying; Florido, Emmanuel A.; Lin, Hsin; Bansil, Arun; Chuang, Feng‐Chuan

doi:10.1038/s41699-019-0118-2

Cited by 57 publications

(34 citation statements)

References 76 publications

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“…This section presents achievement of the large-area highquality TMDCs crystals readily available to be incorporated into practical industrial applications. Many of these methods investigate the growth or isolation of single TMDCs; however, further, development is needed to produce heterojunctions and Janus structures in large-scale as both of these two types of structures are of great interest for high-performance electronic and optical applications [88][89][90]. Enlarging the overlapping areas for these structures augments their performances by providing larger effective areas.…”

Section: Tmdcsmentioning

confidence: 99%

Two-Dimensional Materials in Large-Areas: Synthesis, Properties and Applications

et al. 2020

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HIGHLIGHTS • Two-dimensional materials including TMDCs, hBN, graphene, non-layered compounds, black phosphorous, Xenes and other emerging materials with large lateral dimensions exceeding a hundred micrometres are summarised detailing their synthetic strategies. • Crystal quality optimisations and defect engineering are discussed for large-area two-dimensional materials synthesis. • Electronics and optoelectronics applications enabled by large-area two-dimensional materials are explored. .

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Section: Tmdcsmentioning

confidence: 99%

Two-Dimensional Materials in Large-Areas: Synthesis, Properties and Applications

et al. 2020

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“…In addition to tuning the bandgap sizes, [ 18 ] alloying can tune the optical, electronic and thermal properties of Mo x W (1‐ x ) Se 2 [ 19 ] and MoS 2(1‐ x ) Se 2 x , [ 20,21 ] or the transformation between the Mott‐insulating and metallic phase in 1T‐TaS 2‐ x Se x . [ 22 ] Optimizing doping parameters, including doping concentrations, nature of dopants (e.g., metallic or nonmetallic, transition metals, chalcogen, halogen or pnictogen [ 23 ] ), and doping types (e.g., substitutional doping, interstitial, or physical adsorption) is essential to merit the positive effects on the performance efficiency, durability, and sensitivity of the 2D materials. [ 24 ] However, the options of substituents need to be carefully evaluated because they could impair the properties of 2D TMDs for practical applications by creating deep trap states or destabilizing the structures.…”

Section: Introductionmentioning

confidence: 99%

Controllable Thin‐Film Approaches for Doping and Alloying Transition Metal Dichalcogenides Monolayers

et al. 2021

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Two‐dimensional (2D) transition metal dichalcogenides (TMDs) exhibit exciting properties and versatile material chemistry that are promising for device miniaturization, energy, quantum information science, and optoelectronics. Their outstanding structural stability permits the introduction of various foreign dopants that can modulate their optical and electronic properties and induce phase transitions, thereby adding new functionalities such as magnetism, ferroelectricity, and quantum states. To accelerate their technological readiness, it is essential to develop controllable synthesis and processing techniques to precisely engineer the compositions and phases of 2D TMDs. While most reviews emphasize properties and applications of doped TMDs, here, recent progress on thin‐film synthesis and processing techniques that show excellent controllability for substitutional doping of 2D TMDs are reported. These techniques are categorized into bottom–up methods that grow doped samples on substrates directly and top–down methods that use energetic sources to implant dopants into existing 2D crystals. The doped and alloyed variants from Group VI TMDs will be at the center of technical discussions, as they are expected to play essential roles in next‐generation optoelectronic applications. Theoretical backgrounds based on first principles calculations will precede the technical discussions to help the reader understand each element's likelihood of substitutional doping and the expected impact on the material properties.

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“… 18 , 19 Theoretically, group-VI chalcogenide MXY monolayers, including MoSSe, WSSe, WSeTe, and WSTe monolayers, have been demonstrated to be stable by calculating the phonon dispersion and the molecular dynamics simulations. 20 , 21 Using many-body Green’s function perturbation theory, Li et al found that the Janus MoSSe monolayer showed strong excitonic effects, which can be applied in optoelectronic materials. 22 …”

Section: Introductionmentioning

confidence: 99%

Computational Study of Janus Transition Metal Dichalcogenide Monolayers for Acetone Gas Sensing

Yeh

2020

ACS Omega

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Recently, Janus two-dimensional (2D) transition metal dichalcogenides (TMDs) have been widely investigated and have provided exciting prospects in many fields such as photoelectric materials, photocatalysis, and gas sensors. In this study, we performed density functional theory (DFT) calculations to study the sensitivity of four volatile organic compounds (VOCs), including acetone, methanol, ethanol, and formyl aldehyde, over pristine 2D TMDs and 2D Janus TMD monolayers. We found that MoS 2 , Janus MoSSe, and Janus MoSTe demonstrated greater sensitivity toward acetone than other VOCs. Furthermore, the band gap values of the Janus MoSSe and Janus MoSTe monolayers dramatically changed after acetone adsorption on their sulfur layers, which was quite larger than the band gap change after acetone adsorption on the MoS 2 monolayer. This result also leads to the extremely large conductivity change of Janus MoSSe and Janus MoSTe after sensing acetone. Hence, Janus MoSSe and Janus MoSTe monolayers show much higher sensitivity toward acetone in comparison with the pristine MoS 2 monolayer. Finally, our finding indicates that Janus MoSSe and Janus MoSTe monolayers can be proposed as ultrahigh-sensitivity 2D TMD materials for acetone sensors.

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Predicting two-dimensional topological phases in Janus materials by substitutional doping in transition metal dichalcogenide monolayers

Cited by 57 publications

References 76 publications

Two-Dimensional Materials in Large-Areas: Synthesis, Properties and Applications

Two-Dimensional Materials in Large-Areas: Synthesis, Properties and Applications

Controllable Thin‐Film Approaches for Doping and Alloying Transition Metal Dichalcogenides Monolayers

Computational Study of Janus Transition Metal Dichalcogenide Monolayers for Acetone Gas Sensing

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