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Experimental Physics IV

  1. University
  2. Faculties
  3. Faculty of Mathematics, Natural Sciences, and Materials Engineering
  4. Institute of Physics
  5. Chairs, professors and groups
  6. Experimental Physics IV
  7. Workgroups
  8. Organic Semiconductors
  9. Positions for Theses

Positions for Theses

Theses in Organic Semiconductors

Topics for theses are available on request, see below for a current overview of possible topics.

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Please contact the theses supervisors given below or? Prof. Wolfgang Brütting

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All theses can be written in German or English.

Overview on Topics

Molecular orientation and SOP in organic thin films

? University of Augsburg

Controlling SOP in Organic Thin Films through Substrate Templating Effects

Introduction:?Due to their molecular nature, organic semiconductors are, unlike their inorganic counterparts, extended objects. This ultimately leads to a unique feature of organic semiconductors: molecular orientation in thin film. In other words: the orientation - alignment or "direction" - of each individual molecule in respect to the substrate largely influences light absorption and emission, in many ways. Additionally, in case of so-called polar moledules, which exhibit a permanent dipole moment on the molecule, the orientation also influences electrical parameters, such as charge transport and injection. Spontaneous Orientation Polarization (SOP) describes such an effect, where the permament dipole of the molecule is ordered in the finished thin film.
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Goal: Examine how substrate layer, softness, and morphology affect polar-molecule orientatioon by fabricating controlled substrates and probing them with Kelvin probe. You'll be preparing (mostly single layer) thin films on various substrates by vacuum deposition and measure the surface potential using our Kelvin Probe setup.
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Exciton-Polaron Quenching in TADF OLEDs

Goal: Investigation of exciton-polaron interactions in TADF-based OLEDs and their impact on non-radiative losses, emission efficiency, and efficiency roll-off under bias.

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Host Polarity and SOP Effects on Orientation and Emission in TADF Guest-Host Films and OLEDs

Goal: Fabricating TADF guest–host thin films and OLEDs with different polarity/SOP host materials to study their impact on emitter orientation and optical emission influenced by SOP

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Lead halide perovskite nanocrystals for LEDs

? University of Augsburg

Synthesis of colloidal?CsPbBr? Nanocrystal Solutions and Optical Characterization of Spin-Coated Films

Goal: Different batches of CsPbBr? nanocrystals with controlled sizes and/or surface ligands will be synthesized by systematically tuning the reaction parameters. Thin films of the synthesized nanocrystals will be prepared via spin-coating and characterized with respect to their morphology (using atomic force microscopy), refractive index (using ellipsometry) and emission orientation (using angular dependent photoluminescence).?
For a Master’s thesis, this work can be extended to include the synthesis of CsPb(Cl:Br)?, FAPbBr? or MAPbBr? nanocrystals (FA = formamidinium, MA = methylammonium), and/or the investigation of interactions between nanocrystal layers and topping layers composed of organic molecules.

Note: Individuals with chemistry background are highly appreciated.

Contact: Interested? :-) Just contact? Lea Kolb - German or English is fine.

Poster

Our last poster for the "Bachelor Boerse" with some pointers on possible topics. Click or Tap on the image to view the poster as PDF. ? University of Augsburg, Organic Electronics

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