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Functional Materials

Prof. Peter Müller-Buschbaum

Research Field

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 judge from the knowledge of the microscopic dynamics and structure for explaining the functional characteristics of condensed matter.

Address/Contact

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

Members of the Research Group

Professor

Office

Scientists

Students

Other Staff

Teaching

Course with Participations of Group Members

Titel und Modulzuordnung
ArtSWSDozent(en)Termine
Nanostructured Soft Materials 1
eLearning-Kurs
Zuordnung zu Modulen:
VO 2 Müller-Buschbaum, P. einzelne oder verschobene Termine
Physics with Neutrons 1
eLearning-Kurs
Zuordnung zu Modulen:
VO 2 Petry, W.
Mitwirkende: Senyshyn, A.
einzelne oder verschobene Termine
Polymer Physics 1
eLearning-Kurs LV-Unterlagen
Zuordnung zu Modulen:
VO 2 Müller-Buschbaum, P.
Mitwirkende: Körstgens, V.
einzelne oder verschobene Termine
Seminar über Neutronen in Forschung und Industrie
aktuelle Informationen
Zuordnung zu Modulen:
PS 2 Märkisch, B. Morkel, C. Müller-Buschbaum, P.
Mitwirkende: Heiden-Hecht, T.Park, J.
einzelne oder verschobene Termine
Exercise to Nanostructured Soft Materials 1
Zuordnung zu Modulen:
UE 2 Le Dü, M. Vagias, A.
Leitung/Koordination: Müller-Buschbaum, P.
Termine in Gruppen
Exercise to Physics with Neutrons 1
Zuordnung zu Modulen:
UE 2 Senyshyn, A.
Leitung/Koordination: Petry, W.
Termine in Gruppen
Exercise to Polymer Physics 1
eLearning-Kurs LV-Unterlagen
Zuordnung zu Modulen:
UE 2 Tian, T. Xiao, T.
Leitung/Koordination: Müller-Buschbaum, P.
Termine in Gruppen
Aktuelle Probleme der organischen Photovoltaik
Zuordnung zu Modulen:
SE 2 Müller-Buschbaum, P. einzelne oder verschobene Termine
Dozentensprechstunde Polymerphysik 1
Zuordnung zu Modulen:
RE 2 Körstgens, V.
Leitung/Koordination: Müller-Buschbaum, P.
Termine in Gruppen
Edgar-Lüscher-Lehrerfortbildungs-Seminar "Physik von Klima und Wetter"
Diese Lehrveranstaltung ist keinem Modul zugeordnet.
WS 2 Müller-Buschbaum, P.
FOPRA-Versuch 42: Rasterkraftmikroskopie (AEP, KM)
aktuelle Informationen
Zuordnung zu Modulen:
PR 1 Apfelbeck, F.
Leitung/Koordination: Müller-Buschbaum, P.
FOPRA-Versuch 61: Neutronenstreuung am FRM II (AEP, BIO, KM, KTA)
aktuelle Informationen
Zuordnung zu Modulen:
PR 1 Georgii, R.
Leitung/Koordination: Müller-Buschbaum, P.
Führung durch die Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II) für Studierende der Physik
aktuelle Informationen
Zuordnung zu Modulen:
EX 0.1
Leitung/Koordination: Müller-Buschbaum, P.
Seminar: Polymere
Zuordnung zu Modulen:
SE 2 Müller-Buschbaum, P. Papadakis, C. einzelne oder verschobene Termine
Seminar über Struktur und Dynamik kondensierter Materie
Zuordnung zu Modulen:
SE 2 Müller-Buschbaum, P. Papadakis, C. einzelne oder verschobene Termine
Sprechstunde zu Nanostrukturierte, weiche Materialien 1
Zuordnung zu Modulen:
RE 2 Müller-Buschbaum, P. Termine in Gruppen

Offers for Theses in the Group

High efficiency next generation organic solar cells
Next generation organic solar cells are solar cells beyond the silicon type photovoltaic devices. Organic solar cells have reached efficiencies in the champion solar cells well above 18%. Key element of such solar cells is the highly designed active layer, which transfers light into separated charge carriers. Aim of this experimental project is the preparation and full characterization of an active layer for high performance organic photovoltaic devices to further understand the fundamental correlation between morphology and solar cell performance. In this work a novel efficiency record-setting system will be investigated regarding the influence of an additional third component, in our case, either solvent additive or polymer. The project will involve a literature review, sample preparation, photovoltaic device fabrication and photoluminescent measurements. The focus is the usage of advanced scattering techniques for the determination of structural length scales of the active layer in the solar cell.
suitable as
  • Master’s Thesis Applied and Engineering Physics
Supervisor: Peter Müller-Buschbaum
Lightweight Organic Solar Cells as Alternative to Nuclear Batteries for Deep Space Power Generation
The exploration of the outer solar system so far relied heavily on the use of scarce, highly radioactive plutonium stockpiles for power generation, as traditional solar cells have a too low power-to-mass ratio in low light environments to be suitable for those missions. Latest advances in organic solar cells now open up the possibility of utilising them on lightweight foils as photovoltaic solar sails for efficient power generation in low solar irradiation conditions. We have just recently successfully demonstrated the first power generation of organic solar cells on a suborbital space-mission, featuring our in-house developed "Organic and Hybrid Solar Cells In Space" (OHSCIS) experiment. While this demonstration still employed a more traditional, non weight-optimised solar cell design for more typical earth-bound applications, your task will now be to further optimise the design and material selection to reduce the mass of our organic solar cells for our next upcoming space-mission. The solar cells you build will then take part in this mission and be launched into space.
suitable as
  • Master’s Thesis Applied and Engineering Physics
Supervisor: Peter Müller-Buschbaum
Lithium-ion batteries with modified electrolyte for next generation batteries
Lithium-ion batteries are an indispensable energy supply in modern society. The ideal anode consists of lithium metal due to its high specific energy and low electrochemical potential. However, lithium-ion batteries with liquid electrolyte are prone to form lithium dendrites, which can lead to failure or even explosion of the battery. Therefore, polymer electrolytes are an attractive alternative to bypass these obstacles. However, polymer electrolytes suffer from high contact resistances and low ionic conductivities, which requires an elevated operating temperature. In this project, a hybrid electrolyte based on liquid electrolyte modified with polymer will be prepared. Then, CR2032 coin cell batteries will be fabricated and tested with standard cycling procedures. Besides electrochemical characterization techniques, complementary measurement like real space imaging techniques (scanning electron microscopy, SEM) and reciprocal space techniques (small angle x-ray scattering, SAXS) can be performed. Overall, this master thesis project involves literature review, sample preparation and data analysis.
suitable as
  • Master’s Thesis Applied and Engineering Physics
Supervisor: Peter Müller-Buschbaum
Low-temperature fabrication of titania films for hybrid solar cells on flexible substrates
Low-temperature (<150°C) route towards titania films offer promise for simple manufacturing, compatibility with flexible substrates, and titania-based solar cells. Herein, we use a specific titania precursor, ethylene glycol-modified titanate, to fabricate titania films as an electron-transporting layer. This experimental bachelor thesis aims at understanding the working principle of hybrid solar cells and the corresponding fabrication process. Different film characterization will be used such as SEM, GISAXS, XRD, UV-Vis, XPS, etc. The project will involve a literature review, sample preparation process, data analysis and result evaluation.
suitable as
  • Master’s Thesis Applied and Engineering Physics
Supervisor: Peter Müller-Buschbaum
Near-infrared Quantum Dot Solar Cells for Space Application

We’re looking for a master student to join the next flight project of NIR CQDs solar cells to space. The general idea about this research topic and your major tasks in this project are introduced as follow.

Quantum dots (QDs) are semiconductor nanocrystals with typical size of 2-10 nm. When the size of materials become very small in the range of nanometers, the optoelectronic properties or other properties are significantly different from their bulk counterparts. Notably, colloidal QDs’ unique advantages and properties have shown great promises as the light absorbers in solar cells, such as solution-processability and size tunability of bandgap, which enables the QD absorbers to harvest infrared low-energy photons of the solar spectrum beyond the absorption edge of silicon very efficiently. Therefore, as opposed to the costly and complicated fabrication process of conventional NIR solar cells, colloidal QDs based NIR solar cells have shown great promises. To date, great advances and improvements of the device performance, exceeding efficiencies of 10 % already, have been achieved by several fabrication strategies.

In a previous experiment, we launched organic and perovskite solar cells to space for the first time ever and studied how these devices operate in the space environment. For the second space flight, we want to test the operation of NIR colloidal QD solar cells in orbital altitudes for the first time. Here, your master thesis starts.

The first part of your project will be to learn how to fabricate NIR CQD solar cells and characterize them with different spectroscopic and morphologic analysis methods. You will find yourself in a team of motivated master students that are all working on the fabrication and optimization of their solar cell systems, where knowledge exchange and communication create a solid base for a productive and educational environment. Thus, you will learn a lot about solar cells and the principles behind many of their typical characterization methods. Based on your measurements of your solar cells, you will be guided to optimize the fabrication methods and solar cell layers to improve the device performance.

The second part of this project will be to study your solar cells before and after their space flight to learn how the solar cells behave after experiencing extreme conditions during the rocket flight and exotic space environment. Your novel results will be worth publishing in a scientific journal, giving you the possibility to become a co-author in this future work. We’re looking forward to meeting you and telling you more about this project!

suitable as
  • Master’s Thesis Applied and Engineering Physics
Supervisor: Peter Müller-Buschbaum
Printed perovskite solar cells
Organic-inorganic lead halide perovskite solar cells have recently achieved 25.5% efficiency owing to their tunable bandgap, high carrier mobility and long diffusion length. Nevertheless, most of the solar cells were fabricated based on the spin-coating method, which suffers from waste of material and missing scalability. In this regard, the printing technique, a simple and scalable method, is advantageous to realize a future commercial application of perovskite solar cells. In this project, we aim to fabricate perovskite solar cells by printing and have an overall understanding of the growth mechanism of the perovskite film during printing. We use imaging techniques (e.g. electron microscopy) and methods for structure and morphology determination, e.g. X-ray scattering.
suitable as
  • Master’s Thesis Applied and Engineering Physics
Supervisor: 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.
suitable as
  • Master’s Thesis Applied and Engineering Physics
Supervisor: Peter Müller-Buschbaum
Smart nano-sensors made of stimuli-responsive polymers in solution and in thin films
Whereas macroscopic sensors made of stimuli-responsive hydrogels are well established, in the nanoworld such sensors still face many challenges. Potential fields of application of such sensors extend from engineering to bioengineering and medicine, e.g. as nanosensors for the control of concentration of glucose for diabetes patients or as switchable surface in the frame of tissue engineering. In this experimental project smart hydrogels, made of stimuli-responsive hydrogels will be investigated. Hydrogel films with thicknesses of a few tens to some hundreds of nanometers and spontaneously deswell or swell due to external stimuli, like temperature or the concentrations of ions. The changes in thickness and in molecular interactions in swelling or collapsing hydrogels will be probed during the switching process by different lab-based techniques. A comprehensive understanding of the switching process can be achieved by complementary neutron scattering experiments at large scale facilities. The project will involve a literature review, preparation of hydrogels, as well as experimental investigations and interpretations of the repeated switching of the stimuli-responsive hydrogels.
suitable as
  • Master’s Thesis Applied and Engineering Physics
Supervisor: Peter Müller-Buschbaum
Synthesis and self-assembly of gold nanoparticles for optoelectronic devices
Gold nanoparticles (Au NPs) show peculiar optical and electrical properties compared with the macroscopic metal owing to the characteristic of a nanoscale. Recently many advantages were made in optoelectronic devices applications with broadening band and energy transfer. In this project, your work will focus on the Au NPs structure regulation, since the size, density, and morphology of the Au NPs will influence the crystallinity of the photoactive film and charge transportation of the device. Specifically, you can work on one of the following topics: a) Synthesis and investigate optical properties of different morphology of gold nanoparticles b) Self-assembly of monolayer Au NPs array for optoelectronic devices.
suitable as
  • Master’s Thesis Applied and Engineering Physics
Supervisor: Peter Müller-Buschbaum

Current and Finished Theses in the Group

Printing of Cesium Formamidinium Lead Iodide Perovskite Quantum Dot Thin Films for Photovoltaic Application
Abschlussarbeit im Masterstudiengang Physics (Applied and Engineering Physics)
Themensteller(in): Peter Müller-Buschbaum
Herstellung und Charakterisierung von halbleitenden Kohlenstoffnitrid-Dünnfilmen für Anwendung in der Perowskit-Photovoltaik
Abschlussarbeit im Masterstudiengang Physics (Applied and Engineering Physics)
Themensteller(in): Peter Müller-Buschbaum
Printed Two-Dimensional Perovskite Thin Films
Abschlussarbeit im Bachelorstudiengang Physik
Themensteller(in): Peter Müller-Buschbaum
Hot Slot Die Coating for Organic Solar Cells Using the Halogen-free Solvent 1,2,4-Trimethylbenzene
Abschlussarbeit im Bachelorstudiengang Physik
Themensteller(in): Peter Müller-Buschbaum
Near-infrared Quantum Dot Solar Cells for Space Application
Abschlussarbeit im Masterstudiengang Physics (Applied and Engineering Physics)
Themensteller(in): Peter Müller-Buschbaum
Novel Dry Electrode for Detecting Electroencephalography
Abschlussarbeit im Masterstudiengang Biomedical Engineering and Medical Physics
Themensteller(in): Peter Müller-Buschbaum
Polarized Neutron Scattering on the Magnetization Reversible of the Multiferroic Spinel CoCr2O4
Abschlussarbeit im Masterstudiengang Physics (Applied and Engineering Physics)
Themensteller(in): Winfried Petry
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