Regensburg 2019 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 12: Diamond II (joint session KFM/HL)

KFM 12.5: Vortrag

Mittwoch, 3. April 2019, 11:10–11:30, PHY 5.0.20

Thermoelectric generator made of tailored carbon allotropes — •Rudolf Borchardt, Timo Fromm, and Stefan Rosiwal — Chair of Materials Science and Engineering for Metals, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany

A thermoelectric generator (TEG) can be used to recover energy by the conversion of waste heat into electricity. Therefore such generators use thermoelectric materials that directly generate electrical power from a temperature difference, without any moving parts. However common thermoelectric materials suffer from rarity, are toxic or are not temperature stable for a long time. Our aim is to develop new thermoelectric materials with good availability base on carbon allotropes. Here we show a TEG made out of three different kinds of carbon allotropes: micro crystalline diamond for fast thermal transport, as well as p-type nano crystalline diamond and n-type graphene nanowalls as the active materials for the energy conversion. The materials were produced as freestanding foils by chemical vapor deposition (CVD), and laser cut pieces of the foils were brazed with an active silver-titanium solder to fabricate the TEG. This TEG was tested up to a temperature difference of 200 K, resulting in an open circuit voltage of over 120 mV and an output power of 118 µW.