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Related Concept Videos

Semiconductors01:22

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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Fermi Level Dynamics01:12

Fermi Level Dynamics

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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
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Carrier Generation and Recombination01:22

Carrier Generation and Recombination

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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
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Types of Semiconductors01:20

Types of Semiconductors

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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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Band Theory02:35

Band Theory

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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
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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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Subgap Absorption in Organic Semiconductors.

Nasim Zarrabi1, Oskar J Sandberg1, Paul Meredith1

  • 1Sustainable Advanced Materials (Ser-SAM), Department of Physics, Swansea University, Singleton Park, Swansea SA2 8PP, United Kingdom.

The Journal of Physical Chemistry Letters
|March 24, 2023
PubMed
Summary
This summary is machine-generated.

This study explores subgap states in organic semiconductors, detailing methods to identify their absorption features and parameterize them using spectral line shapes. It also examines their thermodynamic impact on device performance.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Organic Electronics

Background:

  • Organic semiconductors are crucial for light emission, photovoltaics, and optoelectronics.
  • Their properties are dictated by molecular disorder, leading to subgap states like tail states and traps.
  • These subgap states significantly influence device performance.

Purpose of the Study:

  • To review methods for determining absorption features of subgap states.
  • To explain the parametrization of subgap states via spectral line shapes.
  • To elucidate the thermodynamic role of subgap states in organic semiconductor devices.

Main Methods:

  • Summarizing techniques to identify subgap state absorption.
  • Explaining spectral line shape analysis for subgap state parametrization.
  • Thermodynamic analysis of subgap state influence on device metrics.

Main Results:

  • Established methods for characterizing subgap state absorption features.
  • Developed a framework for parametrizing subgap states based on spectral data.
  • Quantified the thermodynamic impact of subgap states on device performance.

Conclusions:

  • Subgap states are integral to understanding organic semiconductor behavior.
  • Accurate characterization and parametrization are key to optimizing devices.
  • Thermodynamic perspectives offer valuable insights into device efficiency and stability.