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Related Concept Videos

Semiconductors01:22

Semiconductors

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...
Theory of Metallic Conduction01:17

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Semiconducting layered technetium dichalcogenides: insights from first-principles.

Philippe F Weck1, Eunja Kim, Kenneth R Czerwinski

  • 1Sandia National Laboratories, Albuquerque, NM 87185, USA. pfweck@sandia.gov.

Dalton Transactions (Cambridge, England : 2003)
|September 14, 2013
PubMed
Summary

This study details the atomic structures and semiconductor properties of technetium dichalcogenides (TcS2, TcSe2, TcTe2). New insights reveal their electronic and thermal characteristics, crucial for materials science applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Layered transition metal dichalcogenides (TMDs) are of significant interest due to their unique electronic and optical properties.
  • Technetium dichalcogenides (TcS2, TcSe2, TcTe2) represent an underexplored class of TMDs with potential applications.

Purpose of the Study:

  • To investigate the structural, electronic, and thermal properties of layered technetium dichalcogenides (TcS2, TcSe2, TcTe2).
  • To provide atomic-level structural data for TcSe2 and TcTe2, reported for the first time.
  • To clarify the structural relationship of TcTe2 with other known TMDs.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed to determine equilibrium structures and electronic properties.
  • Density Functional Perturbation Theory (DFPT) was used to calculate phonon frequencies for thermal property prediction.
  • Structural comparisons were made with existing experimental data and related materials.

Main Results:

  • The equilibrium structures of TcSe2 and TcTe2 were determined, revealing distorted Cd(OH)2-type unit cells.
  • Calculations indicated that stoichiometric TcTe2 is not isomorphous to the β-MoTe2 phase, contrary to previous findings.
  • All three compounds (TcS2, TcSe2, TcTe2) were identified as semiconductors with band gaps of 0.9 eV, 0.8 eV, and 0.3 eV, respectively.

Conclusions:

  • The study provides the first atomic-level structural and electronic property data for TcSe2 and TcTe2.
  • The findings challenge previous structural assignments for TcTe2 based on X-ray diffraction.
  • Predicted semiconductor band gaps and thermal properties offer insights for potential technological applications of these technetium dichalcogenides.