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Related Concept Videos

Fermi Level Dynamics01:12

Fermi Level Dynamics

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...
Carrier Generation and Recombination01:22

Carrier Generation and Recombination

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...
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...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
Schottky Barrier Diode01:27

Schottky Barrier Diode

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...
Fermi Level01:18

Fermi Level

The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...

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Updated: May 19, 2026

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
06:57

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Germanium Vacancy Release and Atomic Off-Centering Engineering for Advanced GeTe Thermoelectrics.

Wen Zhang1, Kai Zhao2, Saichao Cao3

  • 1Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian, China.

Angewandte Chemie (International Ed. in English)
|May 18, 2026
PubMed
Summary

This study enhances germanium telluride (GeTe) thermoelectrics by engineering Ge vacancies and atomic structures. Alloying with CdTe and ZnTe significantly boosts thermoelectric performance and hardness.

Keywords:
Ge vacanciesatomic off‐centeringmechanical hardnessthermoelectric performance

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Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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Fabrication of Bi2Te3 and Sb2Te3 Thermoelectric Thin Films using Radio Frequency Magnetron Sputtering Technique

Published on: May 17, 2024

Area of Science:

  • Materials Science
  • Solid State Physics
  • Nanotechnology

Background:

  • Germanium telluride (GeTe) is a promising thermoelectric material for medium temperatures.
  • High carrier concentrations due to Ge vacancies limit GeTe performance.
  • Current methods to reduce vacancies compromise phonon scattering.

Purpose of the Study:

  • To improve GeTe thermoelectric performance by engineering Ge vacancies and atomic off-centering.
  • To investigate the effects of CdTe and ZnTe alloying on GeTe structure and properties.
  • To achieve high dimensionless figure of merit (zT) and mechanical hardness.

Main Methods:

  • Alloying GeTe with CdTe and ZnTe to create vacancy clusters and hierarchical precipitates.
  • Inducing local off-centering of Ge atoms for enhanced phonon coupling and lattice strain.
  • Analyzing band structure modifications including bandgap widening and impurity bands.

Main Results:

  • Achieved peak dimensionless figure of merit (zT) values of ~2.2 and ~2.1 at 723 K for CdTe and ZnTe alloys, respectively.
  • Obtained average zT values of ~1.4 and ~1.2 over 323-723 K.
  • Demonstrated Vickers hardness exceeding 235 HV, indicating enhanced mechanical properties.
  • Successfully reduced thermal conductivity through local structural engineering.

Conclusions:

  • Ge vacancy release and atomic off-centering engineering are effective strategies for high-performance GeTe thermoelectrics.
  • CdTe/ZnTe alloying offers a pathway to simultaneously enhance thermoelectric efficiency and mechanical stability.
  • This local structural strategy presents a promising approach for advancing thermoelectric materials.