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Related Concept Videos

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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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

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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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Schottky Barrier Diode01:27

Schottky Barrier Diode

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Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
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Entropy01:18

Entropy

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The first law of thermodynamics is quantitatively formulated via an equation relating the internal energy of a system, the heat exchanged by it, and the work done on it. A quantitative formulation of the second law of thermodynamics leads to defining a state function, the entropy.
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P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Related Experiment Video

Updated: Nov 4, 2025

Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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Published on: August 30, 2024

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Entropy engineering promotes thermoelectric performance in p-type chalcogenides.

Binbin Jiang1, Yong Yu1, Hongyi Chen2

  • 1Shenzhen Key Laboratory of Thermoelectric Materials, Department of Physics, Southern University of Science and Technology, Shenzhen, China.

Nature Communications
|May 29, 2021
PubMed
Summary

High-entropy alloys enhance thermoelectric performance in p-type chalcogenides through band convergence and hierarchical structures. This leads to improved Seebeck coefficients, lower thermal conductivity, and higher conversion efficiency for practical thermoelectric applications.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Thermoelectrics

Background:

  • Thermoelectric materials convert heat to electricity, but their efficiency is often limited.
  • P-type chalcogenides are promising thermoelectric materials, but require further optimization.
  • Improving thermoelectric performance is crucial for energy harvesting and waste heat recovery.

Purpose of the Study:

  • To enhance the thermoelectric properties of p-type chalcogenides.
  • To investigate the role of band convergence and hierarchical structures in improving performance.
  • To develop an entropy-based strategy for creating advanced thermoelectric materials.

Main Methods:

  • Alloying with Cadmium (Cd) to induce band convergence.
  • Entropy engineering to create a high-entropy-stabilized matrix with hierarchical structures.
  • Characterization of thermoelectric properties, including Seebeck coefficient and thermal conductivity.
  • Fabrication and testing of segmented thermoelectric modules.

Main Results:

  • Achieved band convergence by reducing light and heavy band energy offsets through Cd alloying.
  • Engineered all-scale hierarchical structures via entropy engineering, leading to phonon scattering and reduced lattice thermal conductivity.
  • Obtained a peak thermoelectric figure of merit (zT) of 2.0 at 900 K for p-type chalcogenides.
  • Demonstrated a high experimental conversion efficiency of 12% at a temperature difference (ΔT) of 506 K in fabricated modules.

Conclusions:

  • The combination of band convergence and hierarchical structures significantly improves thermoelectric performance.
  • An entropy strategy is effective for creating hierarchical structures in high-entropy matrices.
  • This approach offers a pathway for the practical application of low-cost thermoelectric materials.