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Related Concept Videos

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.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Metal-Semiconductor Junctions01:24

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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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Electrochemical Systems01:24

Electrochemical Systems

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Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
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The Electrical Double Layer01:30

The Electrical Double Layer

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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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Charging Conductors By Induction

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The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange charges with any matter.
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Carrier Transport

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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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Large Seebeck effect by charge-mobility engineering.

Peijie Sun1, Beipei Wei1, Jiahao Zhang1

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

Nature Communications
|June 26, 2015
PubMed
Summary
This summary is machine-generated.

A new source for the Seebeck effect, based on charge-carrier relaxation and temperature-dependent mobility, has been identified. This discovery offers a novel approach for designing improved thermoelectric materials.

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Area of Science:

  • Solid-state physics
  • Materials science
  • Thermoelectricity

Background:

  • The Seebeck effect generates electric potential from temperature gradients in solids.
  • Current research focuses on optimizing electronic structure for better thermoelectric performance.
  • An energy-dependent density of states at the Fermi level typically dominates this effect.

Purpose of the Study:

  • To demonstrate an alternative source of the Seebeck effect.
  • To explore the role of charge-carrier relaxation and temperature-dependent mobility.
  • To provide a new avenue for designing advanced thermoelectric materials.

Main Methods:

  • Investigated the Seebeck effect in Ni-doped CoSb3.
  • Analyzed charge-carrier relaxation mechanisms.
  • Correlated mobility changes with Seebeck coefficient variations.

Main Results:

  • Identified charge-carrier relaxation as a significant source of the Seebeck effect.
  • Observed a marked change in mobility due to relaxation regime crossover in Ni-doped CoSb3.
  • Demonstrated that rapid temperature-induced mobility changes contribute to the Seebeck coefficient.

Conclusions:

  • Charge-carrier relaxation offers a new pathway to enhance the Seebeck effect.
  • This mechanism explains features in previously elusive thermoelectric materials.
  • The findings pave the way for novel thermoelectric material design strategies.