Lead Halide Perovskites
Disorder in Lead Halide Perovskites
Contact: H. Grüninger
Hybrid lead halide perovskites are currently considered one of the most promising semiconductor materials for the next generation of solar cells. Due to their structural flexibility to incorporate mixtures of different organic and inorganic cations, and halides, a wide compositional range is accessible allowing for e.g. tuning of the band-gap energy. However, highly alloyed perovskite compositions introduce a high degree of disorder, statically and dynamically....more
In-situ halide (de-)mixing in hybrid perovskites
Contact: H. Grüninger
Mixed halide lead perovskites of the form MAPbI3-xBrx exhibit suitable band-gap energies for highly-efficient tandem solar cell applications. However, when exposed to light, mixed halide perovskites exhibit a severe demixing behavior of their ions, which leads to deterioration of the optoelectronic and device performance of the perovskite and corresponding solar cells, currently hindering their successful commercialization. This project thus aims to comprehensively understand the complex structural dynamics that occur during the (de)mixing of halide perovskites, to improve their phase stability, while preserving their excellent optoelectronic properties....more