Soft Matter Physics and Optoelectronics Group at University of Potsdam

EXTRAORDINAIRE: Addressing the most pressing question of solar energy conversion with organic solar cells

- 2 Ph.D. Positions in Organic Photovoltaic Research.

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postdoctoral and PhD positions in the field of optoelectronics of disordered semiconductors (details enclosed).
 

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

The research of the “Soft Matter Physics and Optoelectronics” group is concerned with physical processes in soft matter semiconducting layers. Our systems of interest comprise traditional soft matter materials such as organic semiconductors, but also organo-metallic perovskite semiconductors and, most recently hybrid systems based on 2D TMDcs. Our particular focus is the understanding and advancement of these systems for specific optoelectronic applications, such as photovoltaic devices and photodetectors.

At the heard of our studies is the nature and dynamics of excitations and charges in these systems. 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, but also 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.

News

Graphical Abstract

Large-Grain Double Cation Perovskites with 18 μs Lifetime and High Luminescence

Emilio published his first paper as first author with the Potsdam-Pero Group. In this Article we discussed a high-quality double cation perovskite (MA0.07FA0.93PbI3) with low bandgap energy (1.54 eV). These films exhibit large grains (∼1 μm), high external photoluminescence quantum yields of 20%, and outstanding Shockley–Read–Hall carrier lifetimes of 18.2 μs without further passivation. This was translated into efficient pin-type cells (up to 22.5%) with improved stability under illumination.

 

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Nano-emitting Heterostructures Violate Optical Reciprocity and Enable Efficient

The latest paper from Dr. Caprioglio has been published in ACS Energy letters. Here, halide segregation in methylammonium-free wide bandgap perovskites by photoluminescence quantum yield (PLQY) and advanced electron microscopy techniques was investigated. Learn more by reading the paper by clicking at this link