Related Experiment Video
Updated: Aug 6, 2026
08:50
Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
Published on: November 28, 2017
CVD Grown Hybrid MoSe2-WSe2 Lateral/Vertical Heterostructures With Strong Interlayer Exciton Emission
Md Tarik Hossain1, Sai Shradha2, Axel Printschler1
1Institute of Physical Chemistry, Friedrich Schiller University Jena, Jena, Germany.
Advanced Materials (Deerfield Beach, Fla.)
|July 25, 2026
Summary
We developed a new method to create lateral heterostructures (LHSs) from 2D transition metal dichalcogenides (TMDs). This scalable technique enables tunable domain sizes and demonstrates strong interlayer exciton emission for advanced quantum material applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- 2D transition metal dichalcogenides (TMDs) enable novel photonic and electronic phenomena at interfaces.
- Controlled engineering of lateral heterostructures (LHSs) and their integration into vertical van der Waals heterostructures is challenging.
Purpose of the Study:
- To present a facile synthesis route for MoSe2/WSe2 lateral and hybrid heterostructures.
- To demonstrate control over heterostructure type and lateral domain size.
- To investigate the optical properties of the synthesized heterostructures.
Main Methods:
- Synthesis of lateral (HS I) and hybrid lateral/vertical (HS II) heterostructures using liquid precursors and chemical vapor deposition (CVD).
- Characterization via Raman and photoluminescence (PL) spectroscopy, optical microscopy, atomic force microscopy (AFM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM).
Main Results:
- Tunable heterostructure type and lateral dimensions achieved by adjusting growth parameters.
- Strong interlayer exciton (IE) emission observed in the MoSe2/WSe2 region of HS II.
- IE emission dominates at 4 K and persists up to room temperature (RT), indicating high optical quality.
Conclusions:
- The developed CVD approach offers a scalable route for engineering MoSe2/WSe2 heterostructures.
- The synthesized heterostructures exhibit excellent optical properties, particularly strong interlayer exciton emission.
- These materials are promising for fundamental studies and device applications in 2D quantum materials.
Related Concept Videos
01:26Photochemical Electrocyclic Reactions: Stereochemistry
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
03:24Hybridization of Atomic Orbitals I
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
01:16Structure of Conjugated Dienes
Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
03:35Hybridization of Atomic Orbitals II
sp3d and sp3d 2 Hybridization
02:37Disubstituted Cyclohexanes: cis-trans Isomerism
Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers have the substituents on the same side of the ring, whereas the trans isomers have the substituents on the opposite sides. These stereoisomers exhibit different physical properties and cannot be interconverted without breaking the carbon-carbon bonds.
In cyclohexane, the substituents can occupy different positions generating distinct isomers.
In cyclohexane, the substituents can occupy different positions generating distinct isomers.
01:14π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as annulenes. In...