Master Chemie

This course offers an introduction to the fundamentals of energy conversion processes, as well as material systems and devices used for different energy conversion applications with a focus on solar energy conversion, in particular, using semiconductors for photovoltaic applications.

Electron microscopy can provide a comprehensive characterization of solid samples, including morphology, structure, composition and even electronic properties, with a resolution down to the atomic level. This overview lecture covers the major techniques of electron microscopy as well as associated spectroscopy methods. In addition, ion microscopy for imaging and material manipulation is introduced. Based on electron-sample interactions, basic optics and instrumental aspects, various imaging and spectroscopy methods are discussed with respect to properties such as resolution, sensitivity and limits.The lecture can be either given in English or German, depending on the choice of the students.

This course presents selected physical properties of solids as independent units in a series of lectures. Using experimental and simulated examples, the lectures aim to convey a clear understanding of the central solid state aspects, and weekly alternates with computer exercises (Matlab, Octave, Python) under tight supervision, leading to an in-depth understanding. The content starts with kinematic near- and far-field diffraction (Fresnel,Fraunhofer) at atoms, molecules, nanoparticles and infinite solids. Electronic properties, such as the emergence of a band structure, are presented within the framework of 1D and 2D model systems. This is followed by a wave-optical treatment of of imaging in a light- and electron microscope which is exemplified using meta-materials and crystalline solids. Finally the course deals with phase retrieval based on pure diffraction experiments (Ptychography), as is widely used in, e.g., X-ray scattering, and introduces approaches to simulate multiple scattering (multislice) with low implementation effort.

This course offers an introduction to electronic processes in organic and hybrid organic-inorganic materials, nowadays used in many optoelectronic devices such as light-emitting diodes (LEDs), photovoltaic (PV) cells, and photodetectors. First, the theoretical basics of electronic transitions and excited state dynamics are discussed, specifically: emission spectra of single molecules, molecular aggregates, and bulk samples as well as concepts of energy transfer, charge transport, and photophysical processes in conjugated polymers and organic and hybrid photovoltaic devices. Furthermore, the course offers an introduction to the most common steady-state and time-resolved (transient) all-optical and electro-optical spectroscopy techniques and analysis and interpretation of experimental data from different spectroscopy techniques. Finally, modeling of excited state dynamics using different software tools, for instance multivariate curve resolution analysis of complex spectroscopic data consisting of several components are discussed.