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Apl. Prof. Dr. rer. nat. Peter Müller-Buschbaum

Photo von Prof. Dr. rer. nat. Peter Müller-Buschbaum.
Telefon
+49 89 289-12451
+49 89 289-12458
+49 89 289-12459
+49 89 289-12460
Raum
PH: 3278
E-Mail
muellerb@ph.tum.de
Links
Homepage
Visitenkarte in TUMonline
Arbeitsgruppen
Funktionelle Materialien
Fakultät für Physik
Funktion
Außerplanmäßiger Professor am Physik-Department

Lehrveranstaltungen und Termine

Titel und Modulzuordnung
ArtSWSDozent(en)Termine
Experimentalphysik 1 (MSE)
Zuordnung zu Modulen:
VO 2 Müller-Buschbaum, P. Mi, 15:00–16:30, MW 2001
Nanostructured Soft Materials 1
Zuordnung zu Modulen:
VO 2 Müller-Buschbaum, P. Di, 15:00–16:30, PH 3734
Polymer Physics 1
Zuordnung zu Modulen:
VO 2 Müller-Buschbaum, P. Di, 10:00–12:00, PH II 127
Studentenseminar: Grundlegende Phänomene der Physik der weichen Materie
Zuordnung zu Modulen:
HS 2 Müller-Buschbaum, P. Mo, 13:00–14:30, PH 3734
Exercise to Nanostructured Soft Materials 1
Zuordnung zu Modulen:
UE 2
Leitung/Koordination: Müller-Buschbaum, P.
Termine in Gruppen
Exercise to Polymer Physics 1
Zuordnung zu Modulen:
UE 2
Leitung/Koordination: Müller-Buschbaum, P.
Termine in Gruppen
Übung zu Experimentalphysik 1 (MSE)
Zuordnung zu Modulen:
UE 2
Leitung/Koordination: Müller-Buschbaum, P.
Termine in Gruppen
Aktuelle Probleme der organischen Photovoltaik
Zuordnung zu Modulen:
SE 2 Müller-Buschbaum, P. Mo, 10:00–11:30, PH 3734
Mo, 10:00–11:30, PH 3734
Dozentensprechstunde Polymerphysik 1
Zuordnung zu Modulen:
KO 2 Müller-Buschbaum, P. Di, 17:00–18:30, PH 3278
Edgar-Lüscher-Lehrerfortbildungs-Seminar "Moderne Materialien"
Diese Lehrveranstaltung ist keinem Modul zugeordnet.
WS 2 Müller-Buschbaum, P. Mi, 08:00–20:00
FOPRA-Versuch 42: Rasterkraftmikroskopie
Zuordnung zu Modulen:
PR 1 Müller-Buschbaum, P.
Mitwirkende: Widmann, T.
Seminar: Polymere
Zuordnung zu Modulen:
SE 2 Müller-Buschbaum, P. Papadakis, C. Mi, 13:00–15:00, PH 3734
Seminar über Struktur und Dynamik kondensierter Materie
Zuordnung zu Modulen:
SE 2 Müller-Buschbaum, P. Papadakis, C. Di, 13:15–15:00, PH 3734
Sprechstunde zu Nanostrukturierte, weiche Materialien
Zuordnung zu Modulen:
KO 2 Müller-Buschbaum, P. Di, 18:30–20:00, PH 3278
Sprechstunde zur Experimentalphysik für MSE
Zuordnung zu Modulen:
KO 2 Müller-Buschbaum, P. Mi, 17:00–18:30, PH 3278

Ausgeschriebene Angebote für Abschlussarbeiten

Analysis of metal nanostructure evolution on polymer surfaces

Via sputter deposition thin metal films have been deposited on top of conductive polymer surfaces. Such metal layers are typically used for contacts in organic electronics. During the sputter deposition the growth of the metal film was followed with in-situ scattering. In this project the student will analyze the in-situ scattering data with existing model software. Data will be fitted and from these fit characteristic structure parameters will be determined. From the temporal evolution of such structure parameters the scaling laws of metal growth on polymer can be deduced. The project will involve a literature review, fitting of the existing data with model software and discussion of structure parameters.

geeignet als
  • Bachelorarbeit Physik
Themensteller(in): Peter Müller-Buschbaum
Block copolymer membranes for lithium ion microbatteries

Lithium ion microbattery is the type of battery where all components (electrodes, membrane, and packaging) are in the thin film format. The need for such types of batteries is to provide light-weight and shape flexible solid-state energy sources for some miniature medical devices, such as implantable pumps, biosensors, and wireless capsule endoscopes. Membrane based on mixing both lithium slat and polyelectrolyte block copolymers will be prepared and investigated using small-angle X-ray scattering and impedance spectroscopy. The effect of a third component such as inorganic SiO2 nanoparticles on the morphology and conductivity of the prepared thin film membranes will be studied. The best performing membrane will be assembled between two electrodes to probe the performance of a complete assembly of a solid-state lithium battery. The project will involve a literature review, sample preparation, x-ray scattering and impedance spectroscopy.

geeignet als
  • Bachelorarbeit Physik
Themensteller(in): Peter Müller-Buschbaum
Conductive paper

In the field of solar cells and energy-storage new materials and solution processing technologies emerge which allow the fabrication of thin and flexible devices. The chosen substrate materials will have a major influence on the performance and the overall mechanical properties of these devices. Light-weight paper-based materials have the potential to be a low-cost solution in many different applications. In this project, we will prepare electrical conductive paper as a composite material based on varying amounts of nanostructured cellulose and conducting polymers by spray deposition methods. The sheet resistance of the achieved films and the relation to the morphology of films will be investigated.  Key aspect of the work will be the structural evolution of the films during the deposition process investigated with in situ x-ray scattering techniques.

geeignet als
  • Bachelorarbeit Physik
Themensteller(in): Peter Müller-Buschbaum
Development of a flexible sample environment for neutron scattering on multi-stimuli responsive hydrogel thin films

Since several decades, multi-stimuli responsive hydrogels are attracting the scientific focus, based on their versatile applicability in the fields of sensoric, drug delivery or nano-switches. When changing an external stimulus such as pH, temperature, pressure or light illumination specific dynamic processes are taking place inside the hydrogel network. Thus, these polymers are an interesting foundation for new research fields such as green architecture or soft robotics. In order to apply responsive hydrogels in the aforementioned technical fields, the mechanisms behind these dynamic processes are an object of current research.

Neutron scattering is a powerful and suitable measurement technique for studying dynamic activities inside a hydrogel. Information about thickness, material composition and roughness can be obtained, even during dynamic processes.

The task is to develope a setup for grazing incidence small angle neutron scattering (GISANS) and as such development is required onthe final design and layout of the measurement setup,a quick and reliable sample change system,the electronical circuit and connections to the measurement chamber,a remote-control of all elements andthe read-out system.

First measurements with the constructed sample environment will be performed at neutron scattering instruments at the MLZ.

geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Peter Müller-Buschbaum
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. 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
Themensteller(in): Peter Müller-Buschbaum
High efficiency next generation solar cells

Next generation solar cells are solar cells beyond the silicon type photovoltaic devices. Organic solar cells have reached efficiencies in the champion solar cells well above 10%. 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.

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

Perovskite solar cells have dramatically progressed within the last 2 years. Meanwhile championship perovskite solar cells have demonstrated efficiencies above 22%. However, despite the very promising device efficiencies, most fundamental aspects of this class of solar cells are still not well understood. The relation between inner solar cell morphology and efficiency is not for example unclear. Aim is to probe the morphology of differently prepared and aged perovskite solar cells with scattering techniques and establish a structure-function relationship. The project will involve a literature review, sample preparation and measurements of the structure and device characteristics.

geeignet als
  • Bachelorarbeit Physik
Themensteller(in): Peter Müller-Buschbaum
Hybrid thermoelectric materials based on a polymer-nanoparticle composite

This experimental work comprises the fabrication and analysis of thermoelectric hybrid thin-films. We use the conducting polymer blend PEDOT:PSS, which exhibits high electrical conductivities after treatment with high-boiling point solvents. We aim for an improvement of the thermoelectric capabilities of the film, by combining the polymer with inorganic nanoparticles using standard thin-film fabrication techniques. Samples with different parameters will be prepared and analyzed regarding their electrical and thermal transport properties. The project will involve a literature review, sample preparation, measurements and data interpretation.

geeignet als
  • Bachelorarbeit Physik
Themensteller(in): Peter Müller-Buschbaum
Interfaces between polymer electrolyte, electrodes and metal current collectors of thin film lithium-ion batteries

Our world without lithium ion batteries (LIBs) is hardly imaginable. They are used in nearly every electronic mobile device like laptops, cellphones, cars and medical power implants. But their potential for developing safer and more powerful batteries is not exploited yet since the major LIB production uses technologies commercialized in 1991. Aiming for novel thin film LIBs from solution based processing using polymer electrolytes and sophisticated hybrid electrodes can be the key to new, fast chargeable, high energy and power density LIBs.

Using diblock copolymers like polystyrene-block-polyethylene oxide (PS-b-PEO) with a mechanically and thermally stable PS block and a soft, lithium-ion conducting PEO block enables the fabrication of solid state polymer thin film lithium-ion batteries and even the application of metallic lithium as anode. To increase charge and discharge rates of Li-ion batteries – one of the main drawback of batteries compared to e.g. fossil fuels – these thin film batteries are a promising approach.

The task will be the fabrication of lab scale thin film Li-ion batteries via spin-coating, the morphological investigation of the functional polymer based layers of the battery and their interfaces as well as the revelation of their conductivity and influence on the batteries’ performance. Therefor advanced scattering techniques like grazing incidence small angle X-ray scattering (GISAXS) and X-ray reflectometry (XRR), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and battery cycling.

geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Peter Müller-Buschbaum
Looking into the soft behavior of hybrid crystalline perovskite thin film

Solar cells based on organometallic lead halide perovskites have established themselves as a promising alternatives to commercial thin film solar cells. Photovoltaic conversion efficiencies have seen an increase from first reports of 3.8% to certified efficiencies of over 22% in less than a decade since the inception of the field. The crystallographic versatility of the material allows the possibility of extensive chemical tuning, which manifests in the material as a spectra of properties that may be obtained. This entices research on hybrid perovskite structures combining different organic and inorganic groups into a crystalline framework. Recent evidence indicates that the class of perovskite materials display characteristics which are suggestive of ‘soft matter’ like behavior. Ideal candidates would be helping demonstrate this claim through experimental work. The opportunity to be carrying out work in sophisticated environments, such as working in glovebox or carrying out state-of-the-art experiments at synchrotron sources are feasible. Other characterization techniques would be utilized for relevant archetypal measurements.

The project falls within a rapidly progressing field with great potential for industrialization. Inspired, promising candidates with good academic background and research experience may apply in order to acquire experience on relevant materials, electronic devices made thereof and characterization techniques for holistic knowledge within the booming field.


geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Peter Müller-Buschbaum
Novel heavy element-based molecular materials for hybrid solar cells

Hybrid solar cells are attractive alternatives to standard silicon solar cells, however, efficiencies cannot compete so far. Therefore, we investigate novel organic materials with respect to their suitability in hybrid photovoltaic applications. The advantage of these molecules is the presence of a heavy atom combined with a conjugated backbone. An increase in solar cell efficiency has been observed. In the framework of the thesis the novel heavy element-based molecular material will be characterized via optical microscopy, profilometry and light absorption to learn about film homogeneity, film thickness and the absorption ability being the essential first step for solar cells. Different processing will be tested to improve properties. The project will involve a literature review, sample preparation, measurements and data interpretation.

geeignet als
  • Bachelorarbeit Physik
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
Role of molecular interactions for stimuli-responsive polymers of potential use in soft robotics

Multi-stimuli-responsive polymers have a wide-spread application potential as thin films and switchable coatings, for instance in soft robotics and microfluidic systems. This experimental bachelor thesis aims at the basic understanding of the underlying switching behavior, leading to immense changes of volume and elastic properties. The role of competing molecular interactions for the immense changes in volume are studied for a novel type of multi-stimuli-responsive polymers using Fourier transform infrared spectroscopy. The project will involve a literature review, sample preparation and cyclic switching of the films.

geeignet als
  • Bachelorarbeit Physik
Themensteller(in): Peter Müller-Buschbaum
Smart nano-sensors made of stimuli-responsive nanogels

Stimuli-responsive nanogels have wide-spread applications as nano-sensors, for instance as environmentally responsive coatings and in drug delivery systems. This experimental bachelor thesis aims at the understanding of the underlying switching mechanism of the nano-sensors, based on immense changes in volume and in interactions. Therefore the role of the expansion behavior and of the molecular interactions of a novel type of stimuli-responsive nanogels is studied. The project will involve a literature review, sample preparation and measurements of the molecular changes.

geeignet als
  • Bachelorarbeit Physik
Themensteller(in): 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.


geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Peter Müller-Buschbaum
Structural analysis of hybrid polymer–solid thin films

Nanostructured polymer–solid hybrid thin films have gained a lot of attention during the last decade owing to the broad spectrum of technological applications such as solar cell, Li-ion battery, OLEDs and sensors. The structure of metal nanoparticles-polymer hybrid thin film is successfully probed with advanced grazing-incidence small-angle X-ray technique (GISAXS). In-situ GISAXS study of metal deposition on nanostructured polymer templates is performed at large-scale facility DESY, in Hamburg. In a millisecond time-resolved experiment, large amount of data is generated that enables a real-time monitoring of the growth kinetics of metal nanoparticles on the polymer surfaces. To characterize the structure of these polymer-solid hybrid materials, analysis models needs to be developed for interpreting the resulting GISAXS patterns. Software packages, useful for data analysis for advanced grazing-incidence techniques, are currently available. Structural information on the hybrid films, including the metal particle size, size distribution, positional distribution factor, and particle mobility on the sample surface can be obtained, by applying these analysis models to fit the experimental GISAXS data. The work will answer open questions on how the high-ordered arrays of solid materials forms on polymer surfaces, starting from microscopic (atomistic) up to mesoscopic (aggregate) level.

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