Karlsruhe Institute of Technology (LTI)

Doctoral Researchers:

• Sebastian Stolz, Dr. -Ing. [Merk KGaA]
• Ralph Eckstein, Dr.-Ing.    [Dentsply Sirona]
• Florian Mathies, Dr.-Ing.   [Helmholtz-Zentrum Berlin]

Posdoctoral Researchers:

• Anthony Morfa, Dr.          [The University of Sydney]

1. Adv. Optical. Mater. doi: adom20.1701108 (2018)
   “Fully Digitally Printed Image Sensor Based on Organic Photodiodes”
   R. Eckstein, N. Strobel, U. Lemmer, G. Hernandez-Sosa
2. IEEE Sensors Journal 18, 494 (2018)
   “SnO₂ Nanowire-Based Aerosol Jet Printed Electronic Nose as Fire Detector”
   M. Adib, R. Eckstein, G. Hernandez-Sosa, M. Sommer, U. Lemmer
3. Adv. Funct. Mater., 1705795 (2018)
   “Fully Printed Light-emitting Electrochemical Cells Utilizing Biocompatible Materials”
   J. Zimmermann, L. Porcarelli, T. Rödlmeier, A. Sanchez-Sanchez, D. Mecerreyes, G. Hernandez-Sosa
4. Opt. Express 26, A144-A152 (2018)
   “Inkjet Printed Perovskite Distributed Feedback Lasers”
   F. Mathies, P. Brenner, G. Hernandez-Sosa, I. Howard, U. W. Paetzold and U. Lemmer
5. Adv. Electron. Mater., 1700345 (2017)
   “Semiconductor : Insulator Blends for Speed Enhancement in Organic Photodiodes”
   N. Strobel, R. Eckstein, J. Lehr, U. Lemmer, G. Hernandez-Sosa
6. Chem. Mater., 29, 10150 (2017)
   “Controlled Molecular Orientation of Inkjet Printed Semiconducting Polymer Fibers by Crystallization Templating”
   T. Rödlmeier, S. Beck, M. Held, T. Marzsalek, C. Müller, R. Eckstein, A. J. Morfa, W. Pisula, R. Lovrincic, J. Zaumseil, A. Pucci, U. Lemmer, G. Hernandez-Sosa
7. Adv. Mater. Technol., 1700236 (2017)
   “Digital Aerosol Jet Printing for the Fabrication of Terahertz Metamaterials”
   D. Jahn, R. Eckstein, L. M. Schneider, N. Born, G. Hernandez-Sosa, J. C. Balzer, I. Al-Naib, U. Lemmer, and M. Koch
8. Chem. Mater., 29, 9154 (2017)
   “Sulfone-Based Deep Blue TADF Emitters: Solution-Processed OLEDs with High Efficiency and Brightness”
   N. Jürgensen, A. Kretzschmar, S. Höfle, J. Freudenberg, U. H. F. Bunz, G. Hernandez-Sosa
9. Sensors, 17, 2401 (2017)
   “Lab-on-chip surface-enhanced Raman analysis by aerosol jet printing and roll-to-roll hot embossing”  A. Habermehl, N. Strobel, R. Eckstein, N. Bolse, A. Mertens, G. Hernandez-Sosa, C. Eschenbaum, U. Lemmer
10. ACS Omega, 2, 6500 (2017)
    "Reliability of Aerosol Jet Printed Fluorescence Quenching Sensor Arrays for the Identification and Quantification of Explosive Vapors"
    N. Bolse, R. Eckstein, A. Habermehl, G. Hernandez-Sosa, C. Eschenbaum, U. Lemmer
    

11. Applied Optics, 56, 7774 (2017)
    Electrical and optical properties of reduced graphene oxide thin film deposited onto polyethylene terephthalate by spin coating technique
    H. A. Rivera Tito, A. Habermehl, C. Müller, S. Beck, C. Romero Nieto, G. Hernandez-Sosa, M. E. Quintana Caceda
12. Light-Emitting Electrochemical Cells: Concepts, Advances, and Challenges (Ed. R. Costa) Springer (2017)
    Morphology Engineering and Industrial Relevant Device Processing of Light-Emitting Electrochemical Cells
    G. Hernandez-Sosa, A. J. Morfa, N. Jürgensen, S. Tekoglu, J. Zimmermann
13. Applied Optics, 56,  6476 (2017)
    Simple light-emitting electrochemical cell using reduced graphene oxide and a ruthenium (II) complex
    H. A. Rivera Tito, J. Zimmermann, N. Jürgensen, G. Hernandez-Sosa, and M. E. Quintana Caceda  
14. ACS Omega Accepted (2017)
    Reliability of Aerosol Jet Printed Fluorescence Quenching Sensor Arrays for the Identification and Quantification of Explosive Vapors
    N. Bolse, R. Eckstein, A. Habermehl, G. Hernandez-Sosa, C. Eschenbaum, U. Lemmer
15. Organic Electronics 50, 384 (2017)
    Electron Injection and Interfacial Trap Passivation in Solution-Processed Organic Light-Emitting Diodes by a Poly(Sulfobetaine Methacrylate) Interlayer
    M. Ruscello, S. Stolz, D. L. Gonzalez Arellano, F. Ullrich, S. Hillebrandt, E. Mankel, T. Emrick, A. Pucci, W. Kowalsky, A. L. Briseno, G. Hernandez-Sosa
16. Optics Express 25 (15), 18092 (2017)
    Multispectral Electroluminescence Enhancement of (6,5) Single-Walled Carbon Nanotubes Coupled to Periodic Nanodisk Arrays
    Y. Zakharko, M. Held, A. Graf, T. Rödlmeier, R. Eckstein, G. Hernandez-Sosa, B. Hähnlein, J. Pezoldt, J. Zaumseil
17. ACS Sustainable Chem. Eng. 5, 5368 (2017)
    Solution-Processed Bio-OLEDs with a Vitamin-Derived Riboflavin Tetrabutyrate Emission Layer
    Nils Jürgensen, Maximilian Ackermann, Tomasz Marszalek, Johannes Zimmermann, Anthony J. Morfa, Wojciech Pisula, Uwe H. F. Bunz, Felix Hinkel, and Gerardo Hernandez-Sosa
18. Advanced Materials Technologies, vol. 2, no. 2, Feb. 2017.
    Slot Die Coated and Flexo Printed Highly Efficient SMOLEDs
    Sebastian M. Raupp, Dominik Daume, Serpil Tekoglu, Lisa Merklein, Uli Lemmer, Gerardo Hernandez-Sosa, Hans Martin Sauer, Edgar Dörsam, Philip Scharfer, and Wilhelm Schabel 
19. ACS Applied Materials & Interfaces, vol. 9, no. 3, pp. 2776-2785, Jan. 2017.
    Degradation Mechanisms in Organic Light-Emitting Diodes with Polyethylenimine as a Solution-Processed Electron Injection Layer
    Sebastian Stolz, Yingjie Zhang, Uli Lemmer, Gerardo Hernandez-Sosa, and Hany Aziz
20.  Journal of Materials Chemistry C, vol. 4, no. 47 pp. 11150-11156, Nov. 2016.
    One-step additive crosslinking of conjugated polyelectrolyte interlayers: Improved lifetime and performance of solution-processed OLEDs
    Sebastian Stolz, Martin Petzoldt, Naresh Notadiya, Tobias Rödlmeier, Ralph Eckstein, Jan Freudenberg, Uwe H. F. Bunz, Uli Lemmer, Eric Mankel, Manuel Hamburger, and Gerardo Hernandez-Sosa 
21. Scientific Reports 6, Article number: 36643, Nov. 2016.
    Biodegradable Polycaprolactone as Ion Solvating Polymer for Solution-Processed Light-Emitting Electrochemical Cells
    Nils Jürgensen, Johannes Zimmermann, Anthony John Morfa, and Gerardo Hernandez-Sosa 
22. ACS Sustainable Chemistry & Engineering, 4 (12), pp 7050–7055 Sep. 2016.
    Poly(lactic-co-glycolic acid) (PLGA) as Ion-Conducting Polymer for Biodegradable Light-Emitting Electrochemical Cells
    Johannes Zimmermann, Nils Jürgensen, Anthony J. Morfa, Bohui Wang, Serpil Tekoglu, and Gerardo Hernandez-Sosa
23. Cellulose, vol. 23, no. 110, pp. 1-9, 2016.
    Comparison of biodegradable substrates for printed organic electronic devices
    Anthony J. Morfa, Tobias Rödlmeier, Nils Jürgensen, Sebastian Stolz, and Gerardo Hernandez-Sosa 
24. Advanced Materials, vol. 28, no. 35, pp. 7708-7715, Sep. 2016.
    Digitally Printed Dewetting Patterns for Self-Organized Microelectronics
    Ralph Eckstein, Milan Alt, Tobias Rödlmeier, Philip Scharfer, Uli Lemmer, and Gerardo Hernandez-Sosa 
25. ACS Applied Materials & Interfaces, vol. 8, no. 20, pp. 12959–12967, May 2016.
    High-Performance Electron Injection Layers with a Wide Processing Window from an Amidoamine-Functionalized Polyfluorene
    Sebastian Stolz, Martin Petzoldt, Sebastian Dück, Michael Sendner, Uwe H. F. Bunz, Uli Lemmer, Manuel Hamburger, and Gerardo Hernandez-Sosa
26. Advanced Functional Materials, vol. 26, no. 18, pp. 3172-3178, May 2016.
    The Swiss-Army-Knife Self-Assembled Monolayer: Improving Electron Injection, Stability, and Wettability of Metal Electrodes with a One-Minute Process
    Milan Alt, Malte Jesper, Janusz Schinke, Sabina Hillebrandt, Patrick Reiser, Tobias Rödlmeier, Iva Angelova, Kaja Deing, Tobias Glaser, Eric Mankel, Wolfram Jaegermann, Annemarie Pucci, Uli Lemmer1, U. H. F. Bunz, W. Kowalsky, G. Hernandez-Sosa, R. Lovrinčić, and M. Hamburger
27. Macromolecules, vol. 49, no. 8, pp. 2957–2961, Apr. 2016.
    Photo-Cross-Linkable Polyfluorene–Triarylamine (PF–PTAA) Copolymer Based on the [2 + 2] Cycloaddition Reaction and Its Use as Hole-Transport Layer in OLEDs
    Markus Bender, Korwin M. Schelkle, Nils Jürgensen, Stefanie Schmid, Gerardo Hernandez-Sosa, and Uwe H. F. Bunz 
28. Applied Physics A, vol. 122, no. 3, pp. 1-7, Mar. 2016.
    Adjustable passivation of SiO₂ trap states in OFETs by an ultrathin CVD deposited polymer coating
    Milan Alt, Christian Melzer, Florian Mathies, Kaja Deing, Gerardo Hernandez-Sosa, and Uli Lemmer 
29. ACS Applied Materials & Interfaces, vol. 8, no. 11, pp. 7320–7325, Feb. 2016.
    Emissive Polyelectrolytes as Interlayer for Color-tuning and Electron Injection in Solution-processed Light-emitting Devices
    Serpil Tekoglu, Martin Petzoldt, Sebastian Stolz, Uwe H.F. Bunz, Uli Lemmer, Manuel Hamburger, and Gerardo Hernandez-Sosa 
30. ACS Applied Materials & Interfaces, vol. 8, no. 7, pp. 4940-4945, Feb 2016.
    Naphthalene tetracarboxy-diimide based n-type polymers with removable solubility via thermally cleavable side chains
    Sabina Hillebrandt, Torben Adermann, Milan Alt, Janusz Schinke, Tobias Glaser, Eric Mankel, Gerardo Hernandez-Sosa, Wolfram Jaegermann, Uli Lemmer, Annemarie Pucci, Wolfgang Kowalsky, Klaus Müllen, Robert Lovrinčić, and Manuel Hamburger 
31. Organic Electronics, vol. 28, pp. 118-122, Jan. 2016.
    Fabrication of polymer solar cells from organic nanoparticle dispersions by doctor blading or ink-jet printing
    Sivaramakrishnan Sankaran, Konstantin Glaser, Stefan Gärtner, Tobias Rödlmeier, Kai Sudau, Gerardo Hernandez-Sosa, and Alexander Colsmann 
32. Langmuir, vol. 31, no. 37, pp. 10303-10309, Sep. 2015.
    Dipolar SAMs Reduce Charge Carrier Injection Barriers in n-Channel Organic Field Effect Transistor
    Malte Jesper, Milan Alt, Janusz Schinke, Sabina Hillebrandt, Iva Angelova, Valentina Rohnacher, Annemarie Pucci, Uli Lemmer, Wolfram Jaegermann, Wolfgang Kowalsky, Tobias Glaser, Eric Mankel, Robert Lovrinčić, Florian Golling, Manuel Hamburger, and Uwe H. F. Bunz 
33. Advanced Electronic Materials, vol. 1, no. 8, p 1500101, Aug. 2015.
    Aerosol-Jet Printed Flexible Organic Photodiodes: Semi-Transparent, Color Neutral, and Highly Efficient
    Ralph Eckstein, Tobias Roedlmeier, Tobias Glaser, Sebastian Valouch, Ralf Mauer, Uli Lemmer, and Gerardo Hernandez-Sosa 
34. Physica Status Solidi B, vol. 252, no. 6, pp. 1272-1279, Jun. 2015.
    Impedance spectroscopy: A method for determining the degree of intermixing in stacks of organic semiconductors
    Robert Tone, Nils Bornemann, Norman Mechau, and Edgar Dörsam 
    

35. The Journal of Organic Chemistry, vol. 80, no. 1, pp. 582-589, Jan. 2015.
    Soluble Diazaiptycenes: Materials for Solution-Processed Organic Electronics
    Philipp Biegger, Sebastian Stolz, Sebastian N. Intorp, Yexiang Zhang, Jens U. Engelhart, Frank Rominger, Kenneth I. Hardcastle, Uli Lemmer, Xuhong Qian, Manuel Hamburger, and Uwe H. F. Bunz 
36. ACS Applied Materials & Interfaces, vol. 6, no. 22, pp. 20234-20241, Nov. 2014.
    Processing Follows Function: Pushing the Formation of Self-Assembled Monolayers to High-Throughput Compatible Time Scales
    Milan Alt, Janusz Schinke, Sabina Hillebrandt, Marc Hänsel, Gerardo Hernandez-Sosa, Norman Mechau, Tobias Glaser, Eric Mankel, Manuel Hamburger, Kaja Deing, Wolfram Jaegermann, Annemarie Pucci, Wolfgang Kowalsky, Uli Lemmer, and Robert Lovrincic 
37. Review of Scientific Instruments, vol. 85, no. 10, p. 103103, Oct. 2014.
    Motionless system to measure relative angular emission intensity of decaying or modulated light emitting diodes
    Michal Radziwon, Gerardo Hernandez-Sosa, Christoph Lackner, Helmut Sitter, Clemens Simbrunner 
38. Organic Electronics, vol. 15, no. 9, pp. 2135-2140, Sep. 2014.
    Aerosol jet printed top grids for organic optoelectronic devices
    Ralph Eckstein, Gerardo Hernandez-Sosa, Uli Lemmer, and Norman Mechau 
39. Langmuir, vol. 31, no. 37, pp. 10303–10309, Sep. 2015.
    Dipolar SAMs Reduce Charge Carrier Injection Barriers in n-Channel Organic Field Effect Transistors
    Malte Jesper, Milan Alt, Janusz Schinke, Sabina Hillebrandt, Iva Angelova,  Valentina Rohnacher, Annemarie Pucci, Uli Lemmer, Wolfram Jaegermann, Wolfgang Kowalsky, Tobias Glaser, Eric Mankel, Robert Lovrincic, Florian Golling, Manuel Hamburger, Uwe H. F. Bunz 
40. Organic Electronics, vol. 15, no. 9, pp. 2135-2140, Sep. 2014.
    Aerosol jet printed top grids for organic optoelectronic devices
    Ralph Eckstein, Gerardo Hernandez-Sosa, Uli Lemmer, and Norman Mechau 
41. Journal of Materials Chemistry C 2, pp. 7934-7942, Aug. 2014.
    Impact of processing on the chemical and electronic properties of phenyl-C-₆₁-butyric acid methyl ester
    J. Maibach, T. Adermann, T. Glaser, Ralph Eckstein, Eric Mankel, Annemarie Pucci, Klaus Müllen, Uli Lemmer, Manuel Hamburger, T. Mayer, and Wolfram Jaegermann
    

42. ACS Macro Letters, vol. 3, no. 8, pp. 788-790, Aug. 2014.
    Printing PPEs: Fundamental Structure–Property Relationships
    Fabian Markl, Ingo Braun, Emanuel Smarsly, Uli Lemmer, Norman Mechau, Gerardo Hernandez-Sosa, and Uwe H. F. Bunz 
43. ACS Applied Materials & Interfaces, vol. 6, no. 9, pp. 6616–22, May 2014.
    Investigation of Solution-Processed Ultrathin Electron Injection Layers for Organic Light-Emitting Diodes
    Sebastian Stolz, Michael Scherer, Eric Mankel, Robert Lovrinčić, Janusz Schinke, Wolfgang Kowalsky, Wolfram Jaegermann, Uli Lemmer, Norman Mechau, and Gerardo Hernandez-Sosa 
44. Advanced Materials, vol. 26, no. 20, pp. 3235–3240, May 2014.
    The Compromises of Printing Organic Electronics: A Case Study of Gravure-Printed Light-Emitting Electrochemical Cells
    Gerardo Hernandez-Sosa, Serpil Tekoglu, Sebastian Stolz, Ralph Eckstein, Claudia Teusch, Jannik Trapp, Uni Lemmer, Manuel Hamburger, and Norman Mechau 
45. Organic Electronics, vol. 15, no. 3, pp. 829–834, Mar. 2014.
    Modelling and simulation of gate leakage currents of solution-processed OTFT
    Stefan Hengen, Milan Alt, Gerardo Hernandez-Sosa, Jürgen Giehl, Uli Lemmer, and Norman Mechau 
46. Organic Electronics, vol. 14, no. 12, pp. 3493–3499, Dec. 2013.
    Gravure printed flexible small-molecule organic light emitting diodes
    Serpil Tekoglu, Gerardo Hernandez-Sosa, Edgar Kluge, Uli Lemmer, and Norman Mechau 
47. Organic Electronics, vol. 14, no. 9, pp. 2223–2227, Sep. 2013.
    The role of the polymer solid electrolyte molecular weight in light-emitting electrochemical cells
    Gerardo Hernandez-Sosa, Ralph Eckstein, Serpil Tekoglu, Tobias Becker, Florian Mathies, Uli Lemmer, and Norman Mechau
48. Advanced Functional Materials, vol. 23, no. 25, pp. 3164–3171, Jul. 2013.
    Rheological and drying considerations for uniformly gravure-printed layers: towards large-area flexible organic light-emitting diodes
    Gerardo Hernandez-Sosa, Nils Bornemann, Ingo Ringle, Michaela Agari, Edgar Doersam, Norman Mechau, and Uli Lemmer 
49. Applied Physics Express, vol. 5, no. 7, p. 72101, Jul. 2012.
    Ink-Jet-Printed Organic Semiconductor Distributed Feedback Laser
    Xin Liu, Sönke Klinkhammer, Kai Sudau, Norman Mechau, Christoph Vannahme, Johannes Kaschke, Timo Mappes, Martin Wegener, and Uli Lemmer