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Related Concept Videos

Semiconductors01:22

Semiconductors

There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Energy Bands in Solids01:01

Energy Bands in Solids

Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states that no two...
Types of Semiconductors01:20

Types of Semiconductors

Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...

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Updated: Jun 28, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
08:04

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

Published on: May 27, 2020

Interface Excitons in van der Waals Sandwich Heterostructures.

Chao Zhang1,2, Yuting Li3, Wenwei Chen4

  • 1School of Optoelectronic Science and Engineering and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China.

ACS Nano
|June 26, 2026
PubMed
Summary
This summary is machine-generated.

Polarity engineering in van der Waals heterostructures enables precise control over interface excitons (IFXs). This strategy offers a robust route for designing advanced optoelectronic devices by tuning exciton properties.

Keywords:
Stark effectindium selenideinterface excitonpolarity engineeringsandwich heterostructuretransition metal dichalcogenide

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Last Updated: Jun 28, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
08:04

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Published on: May 27, 2020

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
13:56

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
09:25

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Published on: July 5, 2019

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Exciton engineering in van der Waals heterostructures (vdWHs) is crucial for advanced optoelectronics.
  • Current methods often require precise stacking and are sensitive to moiré potentials.

Purpose of the Study:

  • To demonstrate a polarity-engineering strategy for controlling excitonic properties in vdWHs.
  • To investigate interface excitons (IFXs) in a γ-InSe/transition metal dichalcogenide/γ-InSe sandwich heterostructure.

Main Methods:

  • Fabrication of a sandwich heterostructure using γ-InSe and transition metal dichalcogenides.
  • First-principles calculations and Kelvin probe force microscopy to analyze interfacial charge transfer.
  • Transient spectroscopy to study exciton dynamics and relaxation.

Main Results:

  • Demonstrated IFXs with a linear Stark effect and an ultrasmall dipole moment (0.15 e·nm).
  • Revealed asymmetric interfacial charge transfer driven by γ-InSe's inherent polarity.
  • Observed nonmonotonic relaxation dynamics and signal reversal in transient spectroscopy, indicating pre-existing interfacial charge states.

Conclusions:

  • Polarity engineering offers a versatile and robust method to tune exciton dipole moments, interlayer coupling, and relaxation dynamics in vdWHs.
  • This approach provides new design strategies for next-generation excitonic and optoelectronic devices.