Uli Lemmer

Karlsruhe Institute of Technology (KIT), Germany
Presenter Bio

Uli Lemmer received the Diploma degree in Physics from RWTH Aachen University in 1990 and a Ph.D. from the University of Marburg in 1995. From 1995 to 1996, he held a postdoctoral position with the University of California at Santa Barbara. He was heading the Organic Optoelectronics group at the University of Munich from 1996 to 2002. In 2002 he was appointed a full Professor for Electrical Engineering and Information Technology and Director of the Light Technology Institute, Karlsruhe Institute of Technology (KIT). He is the coordinator of the Karlsruhe School of Optics & Photonics (KSOP) (founded in 2006). He is furthermore heading the device physics competence center within the InnovationLab in Heidelberg since 2011. Since 2013 he is also a co-director of the Institute of Microstructure Technology at KIT.  His research interests are in the field of optoelectronics and the technology and the applications of printable organic and inorganic semiconductors. He has published more than 400 journal papers. He has also contributed to more than 15 patents and patent applications as a co-inventor.

Abstract: Printed thermoelectric generators for energy harvesting
Thermoelectric generators (TEGs) convert heat to electricity without any movable parts. Such devices can play an important role in powering wearables, autonomous sensor nodes, and the Internet-of-Things (IoT). Conjugated polymers and printable inorganic nanomaterials offer the unique advantage of being processable with printing technologies. This opens a pathway for the fabrication of powerful thermoelectric generators with unprecedented low costs for mass applications. We have developed printable organic and inorganic materials for printing processes on ultrathin plastic foils. The latter class of materials has proven to exhibit high figures of merit and good processability [1]. The TEGs are then subsequently fabricated by an automated folding process that allows the ability to adapt the geometry of the devices so that the desired thermal impedance is matched. Using this approach in combination with designed low power electronics forms the basis for several wireless sensor nodes. The talk will introduce the working mechanisms, the choice of the materials, the design considerations, and the system integration [2].   References: [1] Md Mofasser Mallick, Leonard Franke, Andres Georg Rösch, and Uli Lemmer, Shape-Versatile 3D Thermoelectric Generators by Additive Manufacturing, ACS Energy Lett. 6, 85 (2021). https://doi.org/10.1021/acsenergylett.0c02159 [2] Andres Georg Rösch, André Gall, Silas Aslan, Matthias Hecht, Leonard Franke, Md. Mofasser Mallick, Lara Penth, Daniel Bahro, Daniel Friderich and Uli Lemmer, Fully printed origami thermoelectric generators for energy-harvesting, npj Flex. Electron. 5, 1 (2021). https://doi.org/10.1038/s41528-020-00098-1

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