The Perovskite Group
The Perovskite Group is an interdisciplinary Subgroup at the Chair of Soft Matter Optoelectronic. A major interest of our work is to understand how changes in the conformation or structure of organic or hybrid semiconductors affect their optical properties. With these findings, we address technical and application-oriented questions of these semiconductor materials, focusing on their film formation process to advance their successful processing in an industrial context.
Understanding structure-function relationship in halide perovskites
A main question that we address is how changes in the structure of halide perovskites, be it the crystal structure, material composition, or surface morphology impact their electronic structure, especially their optical properties. Due to their soft nature, halide perovskites are prone to changes in their structure, which naturally occur during their crystal growth and film formation, or which we induce, for example by changing the temperature or by applying pressure. We use various absorption and photoluminescence measurement techniques, including steady-state, time-resolved, or in situ during film formation, to understand the fundamental correlation between their structure and their optoelectronic properties.
Innovative processing strategies for halide perovskites
The currently most important processing routes for the film formation of halide perovskites suffer from high complexity, as the material synthesis and layer formation are inseparably linked. We thus aim for new processing strategies which can overcome this existing issue. To decouple the perovskite synthesis from its film formation, we use readily prepared perovskite powders and process them solvent-free via novel spray coating approaches (in close collaboration with the Department of Functional Materials, University of Bayreuth) and/or via pressure treatment. With these strategies, we want to advance the processing of halide perovskites also in an industrial context, allowing for efficient perovskite-based devices such as next-generation solar cells or X-Ray detectors.