Dr. Katharina Broch Profile

Dr. Katharina Broch

at Eberhard Karls Univ. Tübingen

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Author

Publications (3)

Proceedings Article | 26 August 2021 Presentation + Paper

Singlet fission in acene blends

Katharina Broch, Clemens Zeiser, Chad Cruz, Luca Moretti, Margherita Maiuri, Eric Chronister, David Reichman, Roel Tempelaar, Giulio Cerullo, Christopher Bardeen

Proceedings Volume 11799, 117990E (2021) https://doi.org/10.1117/12.2595841

KEYWORDS: Molecules, Chromophores, Absorption, Excitons, Solids, Molecular interactions, Spectroscopy, Solar cells, Picosecond phenomena, Photonic integrated circuits

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Proceedings Article | 2 November 2016 Presentation

Towards highly stable polymer electronics (Conference Presentation)

Mark Nikolka, Iyad Nasrallah, Katharina Broch, Aditya Sadhanala, Michael Hurhangee, Iain McCulloch, Henning Sirringhaus

Proceedings Volume 9943, 99430J (2016) https://doi.org/10.1117/12.2236467

KEYWORDS: Polymers, Organic light emitting diodes, Organic semiconductors, Polymer thin films, Electronics, Flexible displays, Organic electronics, Electronic circuits, Transistors, Amorphous silicon

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Proceedings Article | 23 September 2016 Paper

Thermoelectric transport properties of high mobility organic semiconductors

Deepak Venkateshvaran, Katharina Broch, Chris Warwick, Henning Sirringhaus

Proceedings Volume 9943, 99430U (2016) https://doi.org/10.1117/12.2235503

KEYWORDS: Organic semiconductors, Polymers, Thermoelectric materials, Temperature metrology, Molecules, Modulation, Doping, Semiconductors, Crystals, Physics

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Transport in organic semiconductors has traditionally been investigated using measurements of the temperature and gate voltage dependent mobility of charge carriers within the channel of organic field-effect transistors (OFETs). In such measurements, the behavior of charge carrier mobility with temperature and gate voltage, studied together with carrier activation energies, provide a metric to quantify the extent of disorder within these van der Waals bonded materials. In addition to the mobility and activation energy, another potent but often-overlooked transport coefficient useful in understanding disorder is the Seebeck coefficient (also known as thermoelectric power). Fundamentally, the Seebeck coefficient represents the entropy per charge carrier in the solid state, and thus proves powerful in distinguishing materials in which charge carriers move freely from those where a high degree of disorder causes the induced carriers to remain trapped. This paper briefly covers the recent highlights in the field of organic thermoelectrics, showing how significant strides have been made both from an applied standpoint as well as from a viewpoint of fundamental thermoelectric transport physics. It shall be illustrated how thermoelectric transport parameters in organic semiconductors can be tuned over a significant range, and how this tunability facilitates an enhanced performance for heat-to-electricity conversion as well as quantifies energetic disorder and the nature of the density of states (DOS). The work of the authors shall be spotlighted in this context, illustrating how Seebeck coefficient measurements in the polymer indacenodithiophene-co-benzothiadiazole (IDTBT) known for its ultra-low degree of torsion within the polymer backbone, has a trend consistent with low disorder. ¹ Finally, using examples of the small molecules C8-BTBT and C10-DNTT, it shall be discussed how the Seebeck coefficient can aid the estimation of the density and distribution of trap states within these materials. ^{2, 3}

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