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The research of the “Soft Matter Physics” group is concerned with understanding the physical processes in soft matter semiconductors, including organic and more recently organo-metallic perovskite semiconductors, and at their interfaces with inorganic semiconductors and metals.
Our particular focus is on the nature and dynamics of excitations and charges in these systems, with the goal of improving their performance in electronic and optoelectronic applications. The group has therefore installed a variety of transient techniques, designed to follow the fate of these excitations in functional devices on all relevant time scales, from sub-picoseconds through steady state. The group is particularly known for our time-delayed collection field setup, which is unique with regard to temporal resolution and sensitivity, but we also make use of various all-optical techniques including steady state and time resolved fluorescence spectroscopy and femtosecond transient absorption. The results of these measurements serve as inputs for extensive drift-diffusion simulations, and for the development of analytical models to describe the function of entire devices.
With this knowledge at hand, materials and device structures are further optimized, with the prospect to push the optoelectronic performance parameters beyond current limits.