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Christian Westermeier

Dr. Christian Westermeier

Ph.D. Student

Contact

Ludwig-Maximilians-Universität
Department für Physik - Lehrstuhl Prof. Rädler
Ludwig-Maximilians-Universität
Geschwister-Scholl-Platz 1
80539 München
Germany

Room: Altbau Physik, NZ 033
Phone: +49-(0)89-2180-1453
Fax: +49-(0)89-2180-3182

Work group

Nickel Group

Research Project

Organic thin films of small aromatic molecules exhibit semiconductor properties which make them promising candidates for innovative electronic devices, such as organic field-effect transistors (OFET), photovoltaics (OPV) or light emitting diodes (OLED). We employ thermal deposition techniques in ultra high vacuum, the most controlled way of producing thin films. The morphology of these thin films such as grain orientation, grain size distribution and dislocation densities are supposed to influence the electronic properties substantially. Thus, a main focus of our work is to correlate structural aspects with electronic transport properties.

The primary objective of my PhD project is local characterization of micro- and nanostructured p- and n-conducting organic layers by imaging with a focused laser beam. For this purpose, we use local illumination by laser scanning techniques with submicron resolution to measure the spatially resolved photoresponse, reflection, luminescence and micro-Raman scattering. These local investigations are performed on thin films and heterojunctions arising from self organization of laterally processed organic materials in a field-effect transistor geometry. The gained results help to understand the crucial relation between the real structure and optoelectronic properties of organic thin films and their emerging interfaces.

Research Homepage Nickel Group

Curriculum Vitae

since 2010
Research Associate and Doctoral Candidate at Ludwig-Maximilians-Universität München
Field of Research: Organic Thin Films for Application in Electronics
Fellow of the International Doctorate Program “NanoBioTechnology” (IDK-NBT),
Scholarship of the Elite Network of Bavaria

09/2013 – 12/2013
Visiting Reseacher at University of California, San Diego (UCSD), USA,
group of Prof. D. Basov, Basov Infrared Laboratory

08/2011 – 09/2011
Visiting Reseacher at Bristol Centre for Functional Nanomaterials (BCFN),
group of Prof. H. Hoerber, University of Bristol (UK)

07/2009 – 07/2010
Diploma Thesis at the Ludwig-Maximilians-Universität München
chair of Prof. J. O. Rädler, Experimental Physics - Soft Condensed Matter,
group of PD Dr. B. Nickel, Organic Electronics

10/2007 – 07/2010
Study of Physics, focal Biophysics at Ludwig-Maximilians-Universität München

09/2006 – 04/2007
Erasmus scholarship, exchange student at University of Surrey, Guildford (UK)

10/2004 – 09/2007
Study of Physics (Vordiplom 08/2006) at Ruhr-Universität Bochum

10/2003 – 09/2004
Medical studies at Ruhr-Universität Bochum

06/2003
Abitur at Geschwister-Scholl-Gymnasium, Wetter (Ruhr)

Publications

nat_comm_133pxSub-micron phase coexistence in small-molecule organic thin films revealed by infrared nano-imaging
Christian Westermeier, Adrian Cernescu, Sergiu Amarie, Clemens Liewald, Fritz Keilmann, Bert Nickel
Nature Communications 5, Article Number 4101, doi: 10.1038/ncomms5101 (2014) get article



* press release (in English): "Organic semiconductors: Nano-imaging probes molecular disorder", 13-06-2014
* press release (in German): "Organische Halbleiter: Nano-Lichtquelle enthüllt Molekülordnung", 12-06-2014

 

photorsponse_133pxMapping of Trap Densities and Hotspots in Pentacene Thin-Film Transistors by Frequency-Resolved Scanning Photoresponse Microscopy
Christian Westermeier, Matthias Fiebig, Bert Nickel
Advanced Materials 25, 5719-5724, doi: 10.1002/adma.201300958 (2013) get article




* press release (in English): "Organic electronics: Imaging defects in solar cells", 27-06-2013
* press release (in German): "Organische Elektronik: Solarzellen unter der Lupe", 27-06-2013

* This paper has been highlighted in the July-August 2013 issue of the Journal of Materials Today:
New mapping approach identifies defects in solar cells

Laurie Donaldson
Materials Today 16, 260-261, doi:10.1016/j.mattod.2013.07.015 (2013) get article

* This paper has been featured on the cover of the October 25, 2013 issue of Advanced Materials:
adma_trap_cover_133pxThin Films: Mapping of Trap Densities and Hotspots in Pentacene Thin-Film Transistors by Frequency-Resolved Scanning Photoresponse Microscopy (Adv. Mater. 40/2013)
Christian Westermeier, Matthias Fiebig, Bert Nickel
Advanced Materials 25, 5677-5677, doi: 10.1002/adma.201370251 (2013) get cover