scholarly journals Γ valley transition metal dichalcogenide moiré bands

2021 ◽  
Vol 118 (10) ◽  
pp. e2021826118
Author(s):  
Mattia Angeli ◽  
Allan H. MacDonald
Keyword(s):  
Transition Metal ◽  
Large Scale ◽  
Continuum Theory ◽  
Lattice Relaxation ◽  
Effective Theory ◽  
Honeycomb Lattice ◽  
Transition Metal Dichalcogenide ◽  
Group Vi ◽  
Valence Bands ◽  
Structure Calculations

The valence band maxima of most group VI transition metal dichalcogenide thin films remain at the Γ point all of the way from bulk to bilayer. In this paper, we develop a continuum theory of the moiré minibands that are formed in the valence bands of Γ-valley homobilayers by a small relative twist. Our effective theory is benchmarked against large-scale ab initio electronic structure calculations that account for lattice relaxation. As a consequence of an emergent D6 symmetry, we find that low-energy Γ-valley moiré holes differ qualitatively from their K-valley counterparts addressed previously; in energetic order, the first three bands realize 1) a single-orbital model on a honeycomb lattice, 2) a two-orbital model on a honeycomb lattice, and 3) a single-orbital model on a kagome lattice.

A comprehensive study on carrier mobility and artificial photosynthetic properties in group VI B transition metal dichalcogenide monolayers

2018 ◽  
Vol 6 (18) ◽  
pp. 8693-8704 ◽  
Author(s):  
Ashima Rawat ◽  
Nityasagar Jena ◽  
Dimple Dimple ◽  
Abir De Sarkar
Keyword(s):  
Transition Metal ◽  
Carrier Mobility ◽  
Artificial Photosynthesis ◽  
Transition Metal Dichalcogenide ◽  
Group Vi ◽  
Artificial Photosynthetic ◽  
Photosynthetic Properties ◽  
Comprehensive Study

Artificial photosynthesis in group VI B transition metal dichalcogenide monolayers.

Chalcogen-vacancy group VI transition metal dichalcogenide nanosheets for electrochemical and photoelectrochemical hydrogen evolution

2021 ◽  
Vol 9 (1) ◽  
pp. 101-109
Author(s):  
In Hye Kwak ◽  
Ik Seon Kwon ◽  
Jong Hyun Lee ◽  
Young Rok Lim ◽  
Jeunghee Park
Keyword(s):  
Transition Metal ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Photoelectrochemical Cells ◽  
Transition Metal Dichalcogenide ◽  
Group Vi ◽  
Catalytic Hydrogen ◽  
Catalytic Hydrogen Evolution

Chalcogen vacancies of MoS2, MoSe2, WS2, and WSe2 nanosheets enhanced the catalytic hydrogen evolution reaction in solar photoelectrochemical cells.

Homoepitaxial Growth of Large-Scale Highly Organized Transition Metal Dichalcogenide Patterns

2017 ◽  
Vol 30 (4) ◽  
pp. 1704674 ◽  
Author(s):  
Jianyi Chen ◽  
Xiaoxu Zhao ◽  
Gustavo Grinblat ◽  
Zhongxin Chen ◽  
Sherman J. R. Tan ◽  
...  
Keyword(s):  
Transition Metal ◽  
Large Scale ◽  
Transition Metal Dichalcogenide ◽  
Homoepitaxial Growth

scholarly journals Narrow Excitonic Lines and Large-Scale Homogeneity of Transition-Metal Dichalcogenide Monolayers Grown by Molecular Beam Epitaxy on Hexagonal Boron Nitride

Nano Letters ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 3058-3066 ◽  
Author(s):  
Wojciech Pacuski ◽  
Magdalena Grzeszczyk ◽  
Karol Nogajewski ◽  
Aleksander Bogucki ◽  
Kacper Oreszczuk ◽  
...  
Keyword(s):  
Molecular Beam Epitaxy ◽  
Transition Metal ◽  
Boron Nitride ◽  
Large Scale ◽  
Molecular Beam ◽  
Hexagonal Boron Nitride ◽  
Transition Metal Dichalcogenide

Recent Trends and Developments in Transition Metal Dichalcogenide Photoelectrodes for Solar-to-Hydrogen Conversion

2018 ◽  
Vol 15 (4) ◽  
Author(s):  
S. V. Prabhakar Vattikuti
Keyword(s):  
Transition Metal ◽  
Water Splitting ◽  
Large Scale ◽  
Carrier Transport ◽  
Fossil Fuels ◽  
Chemical Species ◽  
Research Area ◽  
Absorption Capacity ◽  
Transition Metal Dichalcogenide ◽  
Pec Water Splitting

The design of efficient devices for the photoelectrochemical (PEC) water splitting for solar-to-hydrogen (STH) processes has gained much attention because of the fossil fuels crisis. In PEC water splitting, solar energy is converted to a chemical fuel for storage. From the viewpoint of economics and large-scale application, semiconductor photoelectrodes with high stability and efficiency are required. However, although numerous materials have been discovered, challenges remain for their commercialization. Among the enormous number of investigated materials, layered transition metal dichalcogenide (TMD)-based photoelectrodes show attractive performance in PEC devices owing to their suitable narrow bandgaps, high absorption capacity, and fast carrier transport properties. A comprehensive review of TMDs photoelectrodes for STH processes would help advance research in this expanding research area. This review covers the physicochemical features and latest progress in various layered-structure TMD-based photoelectrodes, especially MoS2, as well as various approaches to improve the PEC performance and stability by coupling with active carbon materials, including graphene, CNTs, and conductive carbon. Finally, we discuss the prospects and potential applications for STH processes. This review paper gives insights into the fundamental concepts and the role of active chemical species during the STH conversion processes and their influence in enhancing PEC water splitting performance.

Scalable synthesis of high-quality transition metal dichalcogenide nanosheets and their application as sodium-ion battery anodes

2016 ◽  
Vol 4 (44) ◽  
pp. 17370-17380 ◽  
Author(s):  
Jingwen Zhou ◽  
Jian Qin ◽  
Lichao Guo ◽  
Naiqin Zhao ◽  
Chunsheng Shi ◽  
...  
Keyword(s):  
Transition Metal ◽  
Crystalline Structure ◽  
Large Scale ◽  
Sodium Ion ◽  
Sodium Ion Battery ◽  
Transition Metal Dichalcogenide ◽  
High Quality ◽  
Single Crystalline ◽  
Scalable Synthesis

High-quality 2D WS2, MoS2, MoSe2 and WSe2 nanosheets with a single-crystalline structure have been synthesized on a large scale by a NaCl template-assisted strategy.

scholarly journals Physics of excitons and their transport in two dimensional transition metal dichalcogenide semiconductors

RSC Advances ◽  
2019 ◽  
Vol 9 (44) ◽  
pp. 25439-25461 ◽  
Author(s):  
Bhaskar Kaviraj ◽  
Dhirendra Sahoo
Keyword(s):  
Transition Metal ◽  
Band Gaps ◽  
Transition Metal Dichalcogenide ◽  
Two Dimensional ◽  
Group Vi ◽  
Strong Light ◽  
Matter Coupling ◽  
Infrared Spectral ◽  
Direct Band

Two-dimensional (2D) group-VI transition metal dichalcogenide (TMD) semiconductors, such as MoS2, MoSe2, WS2 and others manifest strong light matter coupling and exhibit direct band gaps which lie in the visible and infrared spectral regimes.

Highly conductive group VI transition metal dichalcogenide films by solution-processed deposition

2007 ◽  
Vol 22 (5) ◽  
pp. 1390-1395 ◽  
Author(s):  
Wooseok Ki ◽  
Xiaoying Huang ◽  
Jing Li ◽  
David L. Young ◽  
Yong Zhang
Keyword(s):  
Thin Films ◽  
Transition Metal ◽  
Room Temperature ◽  
Inert Atmosphere ◽  
Transition Metal Dichalcogenide ◽  
Group Vi ◽  
Solution Processed ◽  
Temperature Conductivity ◽  
Structure Transition ◽  
Room Temperature Conductivity

A new soluble synthetic route was developed to fabricate thin films of layered structure transition metal dichalcogendies, MoS2 and WS2. High-quality thin films of the dichalcogenides were prepared using new soluble precursors, (CH3NH3)2MS4 (M = Mo, W). The precursors were dissolved in organic solvents and spun onto substrates via both single- and multistep spin coating procedures. The thin films were formed by the thermal decomposition of the coatings under inert atmosphere. Structural, electrical, optical absorption, thermal, and transport properties of the thin films were characterized. Surface morphology of the films was analyzed by atomic force microscopy and scanning electron microscopy. Highly conductive and textured n-type MoS2 films were obtained. The measured room temperature conductivity ∼50 Ω−1 cm−1 is substantially higher than the previously reported values. The n-type WS2 films were prepared for the first time using solution-processed deposition. WS2 displays a conductivity of ∼6.7 Ω−1 cm−1 at room temperature.

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