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Related Concept Videos

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Semiconductors

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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...
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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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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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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...
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Two-Dimensional (2D) NMR: Overview01:12

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Many-Body Complexes in 2D Semiconductors.

Jiajie Pei1, Jiong Yang2,3, Tanju Yildirim2,3

  • 1Collaborative Innovation Center for Optoelectronic Science and Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|August 22, 2018
PubMed
Summary

Two-dimensional (2D) semiconductors like transition metal dichalcogenides (TMDs) and black phosphorus (BP) are key for optoelectronics. Understanding their many-body complexes (excitons, trions) is crucial for device applications.

Keywords:
2D materialsbiexcitonsexcitonsoptoelectronic applicationstrions

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optoelectronics

Background:

  • Two-dimensional (2D) semiconductors, including transition metal dichalcogenides (TMDs) and black phosphorus (BP), possess intrinsic bandgaps and strong excitonic emissions.
  • These properties make them highly promising for advanced optoelectronic device applications.
  • Optoelectronic devices based on 2D semiconductors exhibit complex many-body interactions, such as excitons, trions, and biexcitons, which significantly influence their optical and electrical characteristics.

Purpose of the Study:

  • To provide a comprehensive summary of recent research on many-body complexes in 2D semiconductors.
  • To discuss the fundamental theory, experimental investigations, and property modulation of these complexes.
  • To explore the optoelectronic applications and future outlook of many-body complexes in 2D semiconducting materials.

Main Methods:

  • Review of fundamental theoretical frameworks governing many-body complexes in 2D materials.
  • Analysis of experimental techniques for characterizing excitons, trions, and biexcitons.
  • Investigation of methods for modulating the properties of these complexes via environmental stimuli.

Main Results:

  • Enhanced binding energies of many-body complexes due to reduced dielectric screening and increased Coulomb interactions in 2D systems.
  • The atomic thickness and large surface-to-volume ratio of 2D semiconductors enable modulation of their properties.
  • Characterization and manipulation of these complexes are now feasible, paving the way for novel applications.

Conclusions:

  • A thorough understanding of the formation mechanisms of many-body complexes is essential for realizing the full potential of 2D semiconductors in optoelectronics.
  • Continued research into the fundamental physics and experimental control of these complexes will drive innovation in the field.
  • Future work should focus on addressing current challenges and exploring new avenues for optoelectronic applications utilizing these unique quantum phenomena.