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The Soft Matter Physics Group at University of Potsdam

Photo: Jona Kurpiers
White light generation in our transient absorption setup

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.


The Soft Matter Physics group got recognized by the Perovskite-Info weekly newsletter with their recent achievement of record Voc in Sr-containing quadruple cation perovskite pin devices!

Former PwM member Steve Albrecht receives the Karl-Scheel-Preis. Congratulations to Steve!

Steve is currently the head of a Young Investigator Group at the HZB, and he has recently been appointed as W1-Professor at the TU Berlin. His focus of research is perovskite-based tandem solar cells, and we are conducting a successful collaboration with him on highly efficient perovskite solar cells.

Recent Publications

The involvement of charge-transfer (CT) states in the photogeneration and recombination of charge carriers has been an important focus of study within the organic photovoltaic community. In this work, we investigate the molecular factors determining the mechanism of photocurrent generation in low-donor-content organic solar cells, where the active layer is composed of vacuum-deposited C60 and small amounts of organic donor molecules. Read more here!

The incorporation of even small amounts of strontium (Sr) into lead-based quadruple cation hybrid perovskite solar cells results in a systematic increase of the open circuit voltage (Voc) in pin-type perovskite solar cells. Read more here!

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