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Monday, August 11 • 14:00 - 16:00
Organic Semiconductors

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14:00-14:15
Oral: Lixia Zhang
Magnetic Field Effect on Polaron Detrapping in Organic Semiconductor Devices
Co-authors: Ya Yi, Chi Mei Chow, Baikui Li, Hongtao He, Kok Wai Cheah, Jiannong Wang

14:15-14:30
Oral: Feilong Liu
Analytical Theory of Magneto-Electroluminescence in Organic Heterojunction Light-Emitting Devices
Co-authors: Scott Crooker, Paul Ruden, Darryl Smith

14:30-15:00
Invited: Clara Santato

Towards Electrolyte Gated Organic Light Emitting Transistors: Sub-1 V Polymer Transistors with High-Surface Area Carbon Gate Electrodes

Organic Thin Film Transistors (OTFTs) are key elements for low-cost flexible electronics. The replacement of conventional gate dielectrics (e.g. SiO2) with electrolytes as the gating medium is an effective approach to induce high charge carrier densities in the transistor channel upon application of relatively low electric biases, in the order of 1.5 - 4 V [1]. Further lowering of the operating voltage of electrolyte-gated transistors is possible by incorporating in the device structure low-cost, high-surface area carbon gate electrodes.

We report on electrolyte-gated transistors based on light-emitting thin films of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) as the organic semiconductor, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [EMIm][TFSI] as the ionic liquid gating medium, and high-surface area carbon gate electrodes operating at voltages lower than 1 V [2].

Electrochemical impedance spectroscopy and cyclic voltammetry measurements show the electrochemical stability of the high-surface area carbon gate electrode during transistor operation. Such stability dispenses the use of reference electrodes, permits to monitor the electrical potential in the transistor channel, and ensures the compatibility of the applied voltages with the electrochemical stability window of the electrolyte. These results, together with the stability of the photoluminescence signal observed from the polymer film upon application of an electrical bias to the gate electrode, are encouraging findings en route towards electrolyte gated light-emitting transistors.

[1] a) S. H. Kim, K. Hong, Wei Xie, K. Hyung Lee, S. Zhang, T. P. Lodge, C. D. Frisbie 25, 1822-1846, 2013. b) G. Tarabella, F. M. Mohammadi, N. Coppedé, F. Barbero, S. Iannotta, C. Santato and F. Cicoira, Chemical Science, 4, 1395-1409, 2013.
[2] M. Lazzari, C. Arbizzani, F. Soavi, M. Mastragostino, Supercapacitors, Wiley, 2013.

Co-authors: Jonathan Sayago, Xiang Meng, Fabio Cicoira, Francesca Soavi

15:00-15:15
Oral: Stefan Engelbrecht
Hole Transport in Pentacene Thin Films Probed by Terahertz Spectroscopy
Co-authors: Markus Prinz, Thomas Arend, Roland Kersting

15:15-15:30
Oral: Scott Crooker
Magnetic Field Effects in Organic Semiconductor LEDs: Revealing Spin Interactions Between Carriers & Nuclei
Co-authors: Megan Kelley, Nick Martinez, Wanyi Nie, Aditya Mohite, Darryl Smith, Sergei Treitak, Feilong Liu, Paul Ruden

15:30-15:45
Oral: Alexandr Fonari
The Impact of Exact Exchange Energy in Describing the Charge-Transport Properties in Organic Charge-Transfer Semiconductors 
Co-authors: Christopher Sutton, Jean-Luc Bredas, Veaceslav Coropceanu

15:45-16:00
Oral: Kurt Hingerl
Spectroscopic Ellipsometry - An Insight in the Optical Properties of Pristine/Do 
Co-authors: Jacek Gasiorowski 

Session Chairs
NM

Noa Marom

Assistant Professor, Tulane University
Noa Marom received her Ph.D. in 2010 from the Weizmann Institute of Science in her home country of Israel. She was awarded the Shimon Reich Memorial Prize of Excellence for her thesis on describing the electronic structure of organic semiconductors from first principles. She then pursued postdoctoral research at the Institute for Computational Engineering and Sciences (ICES) at the University of Texas at Austin. In 2013 she joined the Physics and... Read More →

Speakers
CS

Clara Santato

École Polytechnique de Montréal
Clara Santato (Ph.D. in Chemistry, University of Geneva) is tenured professor at the Department of Engineering Physics of Ecole Polytechnique in Montreal (EPM). Prior to her appointment, she worked as permanent research scientist for the National Research Council of Italy. She has been visiting scientist at the National Renewable Energy Laboratory and at Purdue University. Her research background is in Organic Electronics (design, fabrication... Read More →


Monday August 11, 2014 14:00 - 16:00
Room 19B

Attendees (4)