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Related Experiment Video

Updated: Aug 21, 2025

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

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Innovative ceramic-matrix composite substrates with tunable electrical conductivity for high-power applications.

Driss Kenfaui1,2, Zarel Valdez-Nava1, Lionel Laudebat1,3

  • 1LAPLACE, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France.

Science and Technology of Advanced Materials
|November 17, 2022
PubMed
Summary

Researchers developed a novel ceramic substrate for wide band gap semiconductor power modules. This new material reduces electrical stress at critical points, improving device lifespan and breakdown voltage by 15%.

Keywords:
Power modulebreakdown voltageceramic-matrix composite substrateelectrical conductivity anisotropygraphenespark plasma sintering

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Semiconductor Physics

Background:

  • Wide band gap semiconductors offer higher voltage operation than silicon.
  • The insulating system in these devices experiences high electric fields at the triple point, reducing lifespan.
  • Mitigating electrical stress at this interface is crucial for reliable power electronics.

Purpose of the Study:

  • To introduce a novel concept for mitigating electrical stress in wide band gap semiconductor power modules.
  • To develop a new substrate material with locally modified properties.
  • To enhance the lifespan and breakdown voltage of power electronic devices.

Main Methods:

  • Numerical simulations to predict stress reduction potential (up to 50%).
  • Fabrication of an Aluminum Nitride (AlN)-based ceramic substrate (material A) with integrated nanocomposite.
  • Spark plasma sintering of AlN with Y2O3 and CaF2 for low electrical conductivity and high thermal conductivity.
  • Incorporation of graphene nanoplatelets (GNP) to create a nanocomposite with controlled electrical conductivity anisotropy (ratio of 10^6).
  • Development of a reproducible process for integrating the nanocomposite into the AlN substrate.
  • Electrical contact establishment, encapsulation, and breakdown voltage testing.

Main Results:

  • The novel substrate effectively mitigated electrical stress by reducing its intensity and shifting it from the triple point.
  • An improvement in breakdown voltage (VB) by 15% was achieved compared to traditional substrates.
  • The developed nanocomposite exhibited significant electrical conductivity anisotropy.
  • The fabrication process demonstrated high reproducibility.

Conclusions:

  • The developed multifunctional ceramic-matrix composite substrate shows significant potential for power electronics.
  • This approach successfully reduces electrical stress at critical interfaces in wide band gap semiconductor devices.
  • The findings pave the way for more robust and higher-performance power electronic components.