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

Photo von Prof. Dr. rer. nat. Peter Müller-Buschbaum.
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+49 89 289-12451
+49 89 289-12458
+49 89 289-12459
+49 89 289-12460
+49 89 289-14704
Raum
PH: 3278
E-Mail
muellerb@ph.tum.de
Links
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Arbeitsgruppe
Funktionelle Materialien
Funktionen
  • Leiter Heinz Maier-Leibnitz Zentrum
  • Lehrstuhl für Funktionelle Materialien
  • Leiter Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II)

Lehrveranstaltungen und Termine

Titel und Modulzuordnung
ArtSWSDozent(en)Termine
Experimentalphysik 2 (MSE)
Zuordnung zu Modulen:
VO 3 Müller-Buschbaum, P. Di, 12:00–14:00, MW 2001
Do, 10:00–11:00, Interims I 102
Mess- und Sensortechnologie (MS&E)
Zuordnung zu Modulen:
VO 2 Große, C. Müller-Buschbaum, P. Mi, 10:00–12:00, PH II 227
Do, 14:00–15:30
sowie einzelne oder verschobene Termine
Nanostructured Soft Materials – advanced topics
Zuordnung zu Modulen:
VO 2 Müller-Buschbaum, P. Di, 15:00–16:30, PH 3734
Funktionelle weiche Materialien
Zuordnung zu Modulen:
PS 2 Müller-Buschbaum, P. Papadakis, C. Di, 08:30–10:00, PH 3734
Physik der weichen Materie
Zuordnung zu Modulen:
HS 2 Müller-Buschbaum, P. Papadakis, C. Mo, 13:00–14:30, PH 3734
Seminar über Neutronen in Forschung und Industrie
Zuordnung zu Modulen:
PS 2 Böni, P. Morkel, C. Müller-Buschbaum, P.
Mitwirkende: Koutsioumpas, A.Skoulatos, M.
Mo, 14:30–16:00, PH HS3
sowie einzelne oder verschobene Termine
Exercise to Nanostructured Soft Materials 2
Zuordnung zu Modulen:
UE 2
Leitung/Koordination: Müller-Buschbaum, P.
Übung zu Experimentalphysik 2 (MSE)
Zuordnung zu Modulen:
UE 1 Körstgens, V.
Leitung/Koordination: Müller-Buschbaum, P.
Termine in Gruppen
Übung zu Mess- und Sensortechnologie (MS&E)
Zuordnung zu Modulen:
UE 1
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
Edgar-Lüscher-Lehrerfortbildungs-Seminar "Große Instrumente für große Fragestellungen"
Diese Lehrveranstaltung ist keinem Modul zugeordnet.
WS 2 Müller-Buschbaum, P. Petry, W. Fr, 08:00–20:00
FOPRA-Versuch 42: Rasterkraftmikroskopie
Zuordnung zu Modulen:
PR 1 Müller-Buschbaum, P.
Mitwirkende: Widmann, T.
Mentorenprogramm im Bachelorstudiengang Physik (Professor[inn]en K–Z)
Zuordnung zu Modulen:
KO 0.2 Kaiser, N. Kienberger, R. Knap, M. Krischer, K. Märkisch, B. … (insgesamt 25)
Leitung/Koordination: Höffer von Loewenfeld, P.
Seminar: Polymere
Zuordnung zu Modulen:
SE 2 Müller-Buschbaum, P. Papadakis, C. Di, 13:00–15:00, PH 3734
Seminar über Struktur und Dynamik kondensierter Materie
Zuordnung zu Modulen:
SE 2 Müller-Buschbaum, P. Papadakis, C. Mi, 13:00–15:00, PH 3734
Sommerschule Funktionelle Materialien
Zuordnung zu Modulen:
WS 1 Müller-Buschbaum, P. Mi, 08:00–20:00
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. Di, 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
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Peter Müller-Buschbaum
Biopolymer templated hierarchical structures for hybrid solar cells

Hybrid solar cells have promising potential for playing a major role in renewable energy transition. They provide the possibility of flexible and light weighted photovoltaic in a large scale roll-to-roll fabrication, by combining the advantages of organic and inorganic semiconductors. For improved device performance, the morphological structure of the system has a crucial influence. This experimental bachelor thesis aims for a novel approach in templating desired hierarchical structure of the inorganic part, using environmentally friendly, non-toxic biopolymers such as proteins. Thin films of protein/semiconductor composites will be fabricated by spray coating for further structural investigations with the help of scanning electron and atomic force microscopy. Besides the laboratory work, the project also involves a literature review.

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
Co-nonsolvency – mixed solvents miss solubility

Thin films of copolymers comprised of a hydrophobic and a thermo-responsive block can act as materials for nanosensors and actuators. When exposed to vapors of water and volatile organic solvents, the films exhibit swelling behaviors that strongly depend on the composition of the surrounding atmosphere. This bachelor thesis will cover the fundamentals of responsive polymers, block copolymer assembly and the co-nonsolvency effect. The experimental part will revolve around thin film preparation, analysis and swelling in mixed vapor chambers. Morphological changes, as well as the development of thickness and refractive index will be investigated via scanning probe microscopy and spectral reflectance techniques. The project will include a brief literature review.

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
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 organic solar cells

Organic solar cells have gained significant improvements via novel organic synthesis methods and optimized fabrication routes, especially with respect to their potential roll-to-roll processing for large-area device manufacturing. Printing technique, such as slot-die printing, allows for up-scaling to industrial-oriented scale which is not the case for laboratory deposition techniques like spin coating. This experimental bachelor thesis aims at understanding organic solar cell working principle and the corresponding fabrication process of solar cell via advanced slot-die printing technique. Besides, the relationship between its efficiency and morphology will be investigated by different measuring technique, such as AFM and small angle x-ray scattering. The project will involve a literature review, sample preparation process, data analysis and result exhibition.

geeignet als
  • Bachelorarbeit Physik
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
In-situ Dynamic Light Scattering at a Neutron Spin Echo Spectrometer

The neutron spin echo spectrometer at the MLZ sees more and more proposals with biological samples. These samples have increased requirements with respect to temperature stability and aggregation state control. To meet these requirements a new sample environment has been developed which includes an in-situ dynamic light scattering set-up and a fine temperature control. This set-up should be characterized with respect to its temperature stability and accuracy using test samples based on poly-L-aminoacids of different chain lengths. These test samples should be characterized with light scattering and light absorption techniques with respect to their suitablity as poly-electrolyte samples for Spin-Echo-Spectroscopy. The stiffness of the poly-electrolyte depending on the charge state of the amino-acid side chain is in the special focus of this study.

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 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 thermoelectric materials for energy savings

Thermoelectric (TE) materials can be used in TE generators to convert a temperature gradient directly into electrical energy. Therefore they are of great interest in terms of waste heat recovery or the use of solar thermal energy. To be qualified as good TE materials, polymers should have a high Seebeck coefficient S and electrical conductivity σ. In this bachelor thesis polymer films will be post-treated with different methods in order to increase S and σ, leading to a novel efficient TE generator. This project will involve a literature review, polymer film preparation/treatment and TE measurements of the fabricated films.

geeignet als
  • Bachelorarbeit Physik
Themensteller(in): Peter Müller-Buschbaum
Printed organic solar cells

Organic photovoltaics are a promising alternative to conventional silicon solar cells as they offer several potential advantages e.g. low weight, high mechanical flexibility and low-cost production. The chemical structure of the polymer donor and the non-fullerene acceptor molecule as well as their ratio have an impact on the structure and performance of an organic solar cell. Printing of active layers with a slot-die-coating technique enables up-scaling of organic solar cells devices. This experimental bachelor thesis aims at the basic understanding of the printing process and the properties of the active material as well as the construction of an organic solar cell. Active layers are printed with different donor:acceptor ratios and post-characterized by methods such as UV/Vis spectroscopy, optical microscopy and scanning electron microscopy. The project will involve a literature review, sample preparation and post-characterization of the films.

geeignet als
  • Bachelorarbeit Physik
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
Self organization routes for nanostructuring hybrid perovskites toward high efficiency photovoltaics

Nanostructuring of thin films has been utilized as a method for light trapping and enhancing the optical path-length of photons within the absorbing material. Structured surfaces utilize geometries to enforce such routes which are commonly attained by energy, cost-extensive techniques such as lithography, plasmon resonance. Hybrid perovskites are solution processable materials that exhibit efficiencies competitive with the state-of-the-art silicon solar cells, at significantly lower costs. The precursors exhibit colloidal nature which makes it possible to tune thin film morphologies by controlling the chemical nature of these precursors by harnessing self-assembly behaviour in drying colloidal dispersions.

Mixed hybrid perovskite thin films will be prepared from colloidal solutions. The solution will be characterized by SAXS, DLS, UV-Vis. Interaction of the solution with substrates will be studied by means of contact angle measurements. Thin films prepared from colloidal dispersions will be characterized by XRD, SEM, AFM, UV-Vis. Solar cells will be prepared and characterized for their photovoltaic response.

geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
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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