Funktionelle Materialien

Prof. Winfried Petry

Forschungsgebiet

We examine the physical fundamentals of material properties using scattering methods (neutrons-, x-ray and dynamic light scattering). The general goal of our research is to jugde from the knowledge of the microscopic dynamics and structure for explaining the functional characteristics of condensed matter.

Adresse/Kontakt

James-Franck-Str. 1/I
85748 Garching b. München
+49 89 289 12452
Fax: +49 89 289 12473

Mitarbeiterinnen und Mitarbeiter der Arbeitsgruppe

Professorinnen und Professoren

Mitarbeiterinnen und Mitarbeiter

Lehrangebot der Arbeitsgruppe

Lehrveranstaltungen mit Beteiligung der Arbeitsgruppe

Ausgeschriebene Angebote für Abschlussarbeiten an der Arbeitsgruppe

Fabrication and investigation of enhanced organic light emitting diode devices (OLEDs)

Organic light emitting diodes (OLEDs) have received high attention in research and industry due to their broad range of potential applications. With their small film thickness, easy processibility and high image quality, they are already used in flat panel displays and lighting elements.  However, their efficiency and lifetime could still be increased. For this purpose, the properties of the materials used in OLED devices need to be better understood.

This experimental work comprises the fabrication and analysis of additional layers applied for enhancing the performance of OLEDs. Special attention is set to the application of a rough, mesoporous and transparent metal oxide film, which serves as a scattering layer to increase the photon extraction and thereby the efficiency. In an OLED device, it shares an interface with the semitransparent, conducting polymer electrode needed to introduce charge carriers into the photoactive material.  The structure of the scattering layer as well as this interface are of particular interest, as they have a pronounced influence on the performance of the OLED. Characterization techniques include electron and atomic force microscopy, electronic measurements and spectroscopic methods of OLED devices and their components. The light scattering ability of the applied metal oxide interlayer is particularly investigated using angle dependent transmission spectroscopy.


geeignet als
  • Bachelorarbeit Physik
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Peter Müller-Buschbaum
Novel dry electrode of detecting electroencephalography

Novel dry electrode of detecting electroencephalography (EEG) has been widely studied to replace the conventional wet electrode and to be applied for long-time monitoring. To maintain a good contact between dry electrode and skin, a morphology investigation at skin/electrode interface will be investigated to induce the surface structure such as nano spatulaes inspired by gecko. Through modifying the nanostructure, surface adhesion will be greatly changed and hence influence signal quality. The goal of this study is to develop a novel dry electrode for EEG detection for more precision in signal, more user-friendly, and more resistant against artefacts. This topic will be focused on materials engineering and nanotechnology, in combination with neuroscience and biotechnology. Skills in nanotechnology such SEM, FIB, Ebeam lithography, EDX, etc will be acquired during this thesis. The final result will be applied on clinical trail for enhancing sleep quality. You will be worked in a joint program between TUM and Rythm at Paris (www.rythm.co), and you will be based in Munich with regular visits to Paris.

geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Peter Müller-Buschbaum
Novel nanostructured thermoelectric hybrid materials
In this project, we aim to fabricate and investigate novel organic-inorganic hybrid materials for thermoelectric applications. The goal is to realize efficient low temperature (T < 100°C) thermoelectric thin films and coatings which can contribute for example to energy efficient buildings. By combining nanostructured inorganic materials with conducting polymers a novel approach for this class of materials shall be realized. Possible inorganic nanomaterial components include Silicon nanocrystals (either undoped, n-type or p-type doped) as well as other nanoparticles. Different polymer materials such as the polymer blends of conjugated polymers, which can be tuned in conductivity and in its nanostructure, shall be used as the organic partner in our hybrid approach.
geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Peter Müller-Buschbaum
Novel pathways to hybrid solar cells

Hybrid solar cells combine an inorganic and an organic component into a photovoltaic cell. They combine the advantages of inorganic materials (e.g. metal oxides: TiO2 or ZnO) such as high charge carrier mobility and very high stability with those of organic materials (e.g. conducting polymers: P3HT) such as cost-effectiveness and flexibility. In comparison with standard silicon solar cells, the hybrid solar cells can be easily manufactured and can allow for alternative processing techniques as for example spray-coating and printing. In contrast to dye sensitized solar cells (DSSCs), hybrid solar cell devices contain no dye as active components and consequently problems such as photo-bleaching are mitigated. Moreover, all materials in the hybrid solar cells are solid and thus no sealing to protect against leakage of aggressive solvents such as in DSSCs is required. Regarding application, the hybrid solar cells are more environmentally friendly. Compared to organic solar cells, which are composed purely out of organic components, hybrid solar cells are expected to have higher lifetime stability. In particular, a degradation of the morphology, which is one pathway in organic solar cell degradation, cannot happen in the hybrid solar cells. The inorganic component acts as a corset to the morphology and prevents structural changes. Despite all these advantages of hybrid solar cells, so far most research on alternative solar cells beyond the silicon solar cells, has been focused on DSSCs and organic solar cells. hybrid solar cells have gained much less attention and therefore have a high undiscovered potential, which will be investigated in the present thesis based on novel pathways.

geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Peter Müller-Buschbaum
Pressure sensitive adhesives applied to fibers

In this experimental project, the student will investigate the debonding mechanisms of pressure sensitive adhesives applied to fiber surfaces. With pressure sensitive adhesives of adjusted viscoelasticity non-permanent bonds are formed. The debonding mechanism of planar surfaces attached to arrangements of fibers will be investigated with a tailor-made instrument combining mechanical and optical measurements. The project will involve a literature review, sample preparation and characterization of surface attached fibers.

geeignet als
  • Bachelorarbeit Physik
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Peter Müller-Buschbaum
Printed polymer-based thin film batteries

Materials for high energy density, solid-state batteries have been tremendously explored in the last decade. In particular, lithium-ion technology has attracted major interest. Among the many different types of batteries, the so-called polymer-based thin film batteries are very attractive as they can be incorporated into thin film devices. An inherent important part of such thin film lithium ion batteries is the membrane and solid-state polymer electrolyte membranes have attracted high attention in this respect. Lithium ions’ incorporation into solid-state polymer electrolyte membranes had shown a significant effect on both, the structure and properties, of the membranes in either the bulk or film format. The morphological reorganization and the thermodynamic properties of the solid-state polymer electrolyte membrane upon adding lithium salts and small molecules are the subjects of the experimental investigation. The polymer membranes will be prepared with printing. The structure and crystallinity of the lithium-doped membranes at different temperatures will be investigated with small/wide-angle X-ray scattering (SAXS/WAXS). The effects of morphology on the ionic conductivity of these ion-conducting membranes will be investigated using impedance spectroscopy. Aim of the present study is to increase conductivity with the help of small molecule additives, which can further improve the membrane morphology beyond the possibilities of the standard approach. Such high conductivity will be very beneficial for further downsizing of polymer-based thin film batteries.

geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Peter Müller-Buschbaum

Abgeschlossene und laufende Abschlussarbeiten an der Arbeitsgruppe

Calculations of Hotchannelfactors for the FRMII using CFD
Abschlussarbeit im Masterstudiengang Physics (Applied and Engineering Physics)
Themensteller(in): Winfried Petry
Perovskite solar cells
Abschlussarbeit im Masterstudiengang Physics (Applied and Engineering Physics)
Themensteller(in): Peter Müller-Buschbaum
Perovskite solar cells
Abschlussarbeit im Masterstudiengang Physics (Applied and Engineering Physics)
Themensteller(in): Peter Müller-Buschbaum
Investigation of an n-type Polymer for Thermoelectric Applications
Abschlussarbeit im Masterstudiengang Physik (Physik der kondensierten Materie)
Themensteller(in): Peter Müller-Buschbaum

Kondensierte Materie

Wenn Atome sich zusammen tun, wird es interessant: Grundlagenforschung an Festkörperelementen, Nanostrukturen und neuen Materialien mit überraschenden Eigenschaften treffen auf innovative Anwendungen.