Tohoku University Technology: Mg2Si thermoelectric conversion film with reduced thermal conductivity while keeping electrical conductivity: T20-338
Mg2Si film with high porosity and uniform vacancies
The development of thermoelectric conversion technology to extract electricity from waste heat is being actively pursued. Mg2Si is a thermoelectric conversion material suitable for the use of industrial waste heat since the thermoelectric conversion efficiency achieves its maximum value at around 300ºC environment. However, the heat is often leaked due to its high thermal conductivity so the conversion efficiency is not as high as expected (cf. right formula). There is a report that the thermal conductivity was decreased by compacting Mg2Si powder into pellet and making it porous, but since the electrical conductivity was also reduced due the grain boundary, the conversion efficiency was not increased. This invention is about a Mg2Si porous film that solves the above issue.
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The revenue generated from technology transfer is reinvested as new research funding for universities and researchers, and is utilized to create further research outcomes. To ensure the smooth operation of this cycle, known as the "Intellectual Creation Cycle," we will vigorously promote technology transfer. The types of seeds we handle include patents, know-how, databases, and programs. We have established a collaborative framework by signing basic technology transfer agreements with the following universities (as of June 1, 2025): Tohoku University, Hirosaki University, Iwate University, Akita University, Fukushima University, Yamagata University, Tohoku Gakuin University, Iwate Medical University, Fukushima Medical University, Aizu University, Miyagi University, Hokkaido University, Muroran Institute of Technology, and Showa Medical University.
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