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Miniaturization of a Thermoelectric Device Capable of Powering IoT Products

Semiconductor microfabrication technology enables voltage output greater than 0.5 V

by National Institute for Materials Science
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Using a semiconductor microfabrication technology, a research team consisting of National Institute for Materials Science (NIMS), AIST, and the University of Tsukuba has succeeded in developing a thermoelectric device consisting of an array of π junctions, each composed of two types of thermoelectric layers connected by a metal electrode layer. This device demonstrated the ability to generate voltages greater than 0.5 V, meeting a criterion for certain IoT (internet of things) device operations.

Thermoelectric conversion modules designed to IoT and other electronic devices need to be integrated into these devices. Most previously developed versions of these modules were made of bulk materials, which are incompatible with miniaturization and integration. The output voltages of thermoelectric conversion modules and devices generally decrease as their sizes diminish. An approach to overcoming this miniaturization-related issue is to create an array of π junctions in a thermoelectric device. This research team created a thermoelectric device using a semiconductor microfabrication technology that can be used to produce micro-scale π junctions with a high degree of precision.

This research team fabricated an in-plane thermoelectric device consisting of a dense array of π junctions, each composed of a p-type Mg2Sn0.8Ge0.2 thin film with high thermoelectric generation efficiency and low electrical resistance, an n-type bismuth layer, which can be produced at room temperature. Despite its small size, this device, equipped with an array of 36 tiny π junctions, was able to generate voltages greater than 0.5 V, satisfying a criterion for certain IoT device operations.

The technique used in this research to create smaller, more compact thermoelectric devices may be used to develop new IoT and other electronic products integrated with thermoelectric devices.

- This press release was originally published on the National Institute for Materials Science website