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Electron. Mater., Volume 6, Issue 3 (September 2025) – 2 articles

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17 pages, 2393 KiB  
Article
Impact of Cu-Site Dopants on Thermoelectric Power Factor for Famatinite (Cu3SbS4) Nanomaterials
by Jacob E. Daniel, Evan Watkins, Mitchel S. Jensen, Allen Benton III, Apparao Rao, Sriparna Bhattacharya and Mary E. Anderson
Electron. Mater. 2025, 6(3), 10; https://doi.org/10.3390/electronicmat6030010 - 6 Aug 2025
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Abstract
Famatinite (Cu3SbS4) is an earth-abundant, nontoxic material with potential for thermoelectric energy generation applications. Herein, rapid, energy-efficient, and facile one-pot modified polyol synthesis was utilized to produce gram-scale quantities of phase-pure famatinite (Cu2.7M0.3SbS4, [...] Read more.
Famatinite (Cu3SbS4) is an earth-abundant, nontoxic material with potential for thermoelectric energy generation applications. Herein, rapid, energy-efficient, and facile one-pot modified polyol synthesis was utilized to produce gram-scale quantities of phase-pure famatinite (Cu2.7M0.3SbS4, M = Cu, Zn, Mn) nanoparticles (diameter 20–30 nm) with controllable and stoichiometric incorporation of transition metal dopants on the Cu-site. To produce pellets for thermoelectric characterization, the densification process by spark plasma sintering was optimized for individual samples based on thermal stability determined using differential scanning calorimetry and thermogravimetric analysis. Electronic transport properties of undoped and doped famatinite nanoparticles were studied from 225–575 K, and the thermoelectric power factor was calculated. This is the first time electronic transport properties of famatinite doped with Zn or Mn have been studied. All famatinite samples had similar resistivities (>0.8 mΩ·m) in the measured temperature range. However, the Mn-doped famatinite nanomaterials exhibited a thermoelectric power factor of 10.3 mW·m−1·K−1 at 575 K, which represented a significant increase relative to the undoped nanomaterials and Zn-doped nanomaterials engendered by an elevated Seebeck coefficient of ~220 µV·K−1 at 575 K. Future investigations into optimizing the thermoelectric properties of Mn-doped famatinite nanomaterials are promising avenues of research for producing low-cost, environmentally friendly, high-performing thermoelectric materials. Full article
(This article belongs to the Special Issue Feature Papers of Electronic Materials—Third Edition)
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18 pages, 5529 KiB  
Article
Thermal Characterization Methods of Novel Substrate Materials Utilized in IGBT Modules
by János Hegedüs, Péter Gábor Szabó, László Pohl, Gusztáv Hantos, Gyula Lipák, Andrea Reolon and Ferenc Ender
Electron. Mater. 2025, 6(3), 9; https://doi.org/10.3390/electronicmat6030009 - 31 Jul 2025
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Abstract
In this article, thermal investigation methods for electrically insulating and thermally conductive substrate materials will be presented. The investigations were performed in their real-world application environment, i.e., in the form of IGBT (insulated gate bipolar transistor) module substrate plates. First, the overall thermal [...] Read more.
In this article, thermal investigation methods for electrically insulating and thermally conductive substrate materials will be presented. The investigations were performed in their real-world application environment, i.e., in the form of IGBT (insulated gate bipolar transistor) module substrate plates. First, the overall thermal resistance and thermal structure function of the system in a multivariable parameter space were revealed using CFD (computational fluid dynamics) simulations. Afterwards, thermal transient testing was performed on real samples, with the help of which the thermal resistance values of the modules were determined using the thermal dual interface test method. The presented tests are not intended to determine material parameters, but to rank different substrate materials based on their thermal performance. Full article
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