Institute of Solid State Physics

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Karin Zojer

Director of CD Laboratory for mass transport through paper

Institute for Solid State Physics
TU Graz
Petersgasse 16
8010 Graz
Tel. +43 316 873 8974
Fax. +43 316 873 8466

   Marie-Curie ITN: THINFACE
   Thermal behavior of OLEDs: A holistic approach
   FWF project: Understanding the transient characteristic of organic transistors
   Christian Doppler Laboratory for mass transport through paper

   513.805 Physik M
   PHT.313UF Modelling and Simulation of Semiconductors

People in the Zojer group
   Ekaterina Baikova
   Jan Peter Schanbacher
   Esther Schennach 

Bachelor projects
   Classification of image features using a trainable detection algorithm

   Tunneling Probability Increases with Distance in Junctions Comprising Self-assembled Monolayers of Oligothiophenes
   Embedded-dipole self-assembled monolayers tune contact resistances in p‐type and n‐type organic transistors
   Pit stop for paper bags
   Opening of the Christian Doppler Laboratory for mass transport through paper
   FWF Elise Richter Fellowship for Dr. Karin Zojer

Scope of the Karin Zojer group

The group of Karin Zojer, centered at the Institute of Solid State Physics, aims at establishing structure to transport-property relationships in disordered solids. The group engages in modeling and simulation of charge transport in organic electronic devices and, recently, mass transport through paper sheets. Starting out from “numerical experiments”, relying on our own, home-made, method implementations (Drift diffusion solver, KMC simulations), we analyze and extract structure-to-property relationships to identify limitations or realistic tuning handles.

Our research interests specifically include
  • hopping transport in disordered organic semiconductors
  • charge injection into disordered organic semiconductors
  • organic thin-film transistors
  • organic light emitting diodes
  • pore structure and pore network descriptors of paper
  • transport through paper
which we study (mostly) with these techniques:
  • Drift-diffusion-based device simulations (home-made code)
  • Kinetic Monte Carlo simulations (home-made code)
  • Image segmentation methods

Highlighted publications

Impact of thermal transport parameters on the operating temperature of organic light emitting diodes
Georgii Krikun, Karin Zojer
J. Appl. Phys. 125 (2019) 085501, DOI: 10.1063/1.5079531

Critical Evaluation of Organic Thin-Film Transistor Models
Markus Krammer, James W. Borchert, Andreas Petritz, Esther Karner-Petritz, Gerburg Schider, Barbara Stadlober, Hagen Klauk, Karin Zojer
Crystals 9 (2019) 85, DOI: 10.3390/cryst9020085 (OPEN)

Small contact resistance and high-frequency operation of flexible low-voltage inverted coplanar organic transistors
James W. Borchert, Boyu Peng, Florian Letzkus, J.N. Burghartz, Paddy K. L. Chan, Karin Zojer, Sabine Ludwigs, Hagen Klauk
Nat. Commun. 10 (2019) 1119, DOI: 10.1038/s41467-019-09119-8 (OPEN)

Embedded Dipole Self‐Assembled Monolayers for Contact Resistance Tuning in p‐Type and n‐Type Organic Thin Film Transistors and Flexible Electronic Circuits
Andreas Petritz, Markus Krammer, Eric Sauter, Michael Gärtner, Giulia Nascimbeni, Benedikt Schrode, Alexander Fian, Herbert Gold, Andreea Cojocaru, Esther Karner‐Petritz, Roland Resel, Andreas Terfort, Egbert Zojer, Michael Zharnikov, Karin Zojer, Barbara Stadlober
Adv. Funct. Mater. 28 (2018) 1804462, DOI: 10.1002/adfm.201804462 (OPEN)

Tunneling Probability Increases with Distance in Junctions Comprising Self-Assembled Monolayers of Oligothiophenes
Yanxi Zhang, Saurabh Soni , Theodorus L. Krijger, Pavlo Gordiichuk, Xinkai Qiu, Gang Ye, Harry T. Jonkman, Andreas Herrmann, Karin Zojer, Egbert Zojer, Ryan C. Chiechi
J. Am. Chem. Soc. 140 (2018) 15048, DOI: 10.1021/jacs.8b09793 (OPEN)

Area dependent behavior of bathocuproine (BCP) as cathode interfacial layers in organic photovoltaic cells
Bhushan R. Patil, Mehrad Ahmadpour, Golnaz Sherafatipour, Talha Qamar, Anton F. Fernandez, Karin Zojer, Horst-Günter Rubahn, Morten Madsen
Sci. Rep. 8 (2018) 12608, DOI: 10.1038/s41598-018-30826-7 (OPEN)

Pore space extraction and characterization of sack paper using μ-CT
Eduardo Machado Charry, Matthias Neumann, Jussi Lahti, Volker Schmidt, Karin Zojer
J. Microsc. 272 (2018) 35, DOI: 10.1111/jmi.12730 (OPEN)

Elementary steps in electrical doping of organic semiconductors
Max L. Tietze, Johannes Benduhn, Paul Pahner, Bernhard Nell, Martin Schwarze, Hans Kleemann, Markus Krammer, Karin Zojer, Koen Vandewal, and Karl Leo
Nat. Commun. 9 (2018) 1182, DOI: 10.1038/s41467-018-03302-z (OPEN)

Utilizing Schottky barriers to suppress short-channel effects in organic transistors
Anton F. Fernandez, Karin Zojer
Appl. Phys. Lett. 111 (2017) 173302 , DOI: 10.1063/1.4997405 (OPEN)

Switching from weakly to strongly limited injection in self-aligned, nano-patterned organic transistors
Karin Zojer, Thomas Rothländer, Johanna Kraxner, Roland Schmied, Ursula Palfinger, Harald Plank, Werner Grogger, Anja Haase, Herbert Gold, Barbara Stadlober
Sci. Rep. 6 (2016) 31387, DOI: 10.1038/srep31387 (OPEN)

Impact of the Capacitance of the Dielectric on the Contact Resistance of Organic Thin-Film Transistors
Karin Zojer, Egbert Zojer, Anton F. Fernandez, Manfred Gruber
Phys. Rev. Applied 4 (2015) 04400, DOI: 10.1103/PhysRevApplied.4.044002 (PDF)