Prof. Dr Karl Leo

We are delighted to announce Prof. Dr Karl Leo as a keynote speaker for innoLAE 2019.


Novel high-performance organic transistor structures

Prof. Leo's keynote address will cover his work on novel, high-performance organic transistor structures, delivering high current densities and new record transit frequencies.

Organic field effect transistors (OFET) have so far not achieved major commercial impact, despite their many attractive properties such as low-cost, low-temperature processing, and flexibility. In this talk, I will discuss recent work which addresses some of the shortcomings of the OFET. One key approach is to introduce controlled electrical doping into OFET structures, allowing better injection and novel operation
principles such as inversion operation. Furthermore, I will discuss vertical transistor structures which have very short channel length without micropatterning. These structures allow much higher current densities than the lateral OFET despite rather simple processing technology. These devices are e.g. well suited to drive organic light emitting diodes (OLED), allowing all-organic flexible OLED displays. Recently,
we have achieved current densities as high as kA/cm^2 [1] and record frequencies above 40MHz [2].

[1] M. P. Klinger et al., Sci. Rep. 7, 4471 (2017)
[2] B. Boroujeni et al., Sci. Rep. 8, 7643 (2018)


Karl Leo obtained the Diplomphysiker degree from the University of Freiburg in 1985, working with Adolf Goetzberger at the Fraunhofer-Institut für Solare Energiesysteme. In 1988, he obtained the PhD degree from the University of Stuttgart for a PhD thesis performed at the Max-Planck-Institut für Festkörperforschung in Stuttgart under supervision of Hans Queisser. From 1989 to 1991, he was postdoc at AT&T Bell Laboratories in Holmdel, NJ, U.S.A. From 1991 to 1993, he was with the Rheinisch- Westfälische Technische Hochschule (RWTH) in Aachen, Germany. Since 1993, he is full professor of optoelectronics at the Technische Universität Dresden. His main interests are novel semiconductor systems like semiconducting organic thin films; with special emphasis to understand basics device principles and the optical response.

His work was recognized by a number of awards, including: Otto-Hahn-Medaille (1989), Bennigsen-Förder-Preis (1991), Leibniz-Award (2002), award of the Berlin- Brandenburg Academy (2002), Manfred-von-Ardenne-Preis (2006), Zukunftspreis of the German president (2011), Rudolf-Jäckel-Prize (2012), and a Dr. techn. h.c. of the University of Southern Denmark (2013). He is cofounder of several companies, including Novaled GmbH and Heliatek GmbH.

Nach dem Physikstudium an der Universität Freiburg promovierte Karl Leo 1988 an der Universität Stuttgart mit einer am Max-Planck-Institut für Festkörperforschung bei Hans Queisser ausgeführten Arbeit zur Ultrakurzzeit-Spektroskopie in Halbleitern. Von 1989 bis 1991 war er Postdoc bei den Bell Laboratories in Holmdel, NJ, U.S.A. und ab 1991 Oberassistent an der RWTH Aachen. Seit 1993 leitet er das Institut für Angewandte Photophysik der Technischen Universität Dresden. Sein aktuelles Arbeitsgebiet sind Organische Halbleiter, von den Grundlagen bis hin zu Anwendungen, z.B. als Organische Leuchtdioden (OLED) und Organische Solarzellen. Seine Arbeiten wurden mehrfach ausgezeichnet, u.a. mit dem Leibniz- Preis der Deutschen Forschungsgemeinschaft und dem Zukunftspreis des Deutschen Bundespräsidenten. Er ist Mitbegründer einiger Firmen, u.a. Novaled GmbH und Heliatek GmbH.


You can read more about Prof. Leo's background and award-winning work via his University webpage.

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