A5070101477- Perovskite Materials and Applications
- Solid-state spectroscopy and crystallography
- Advancements in Solid Oxide Fuel Cells
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
Chemnitz University of Technology
2021-2024
Compositional heterogeneity is commonly observed in mixed bromide/iodide perovskite photoabsorbers, typically with minimal effects on charge carrier recombination and photovoltaic performance. Consistently, it has so far received very limited attention bromide/chloride-mixed perovskites, which hold particular significance for blue light-emitting diodes. Here, we uncover that even a minor degree of localized halide leads to severe non-radiative losses bromide/chloride emitters, presenting...
Ion migration has been reported to be one of the main reasons for hysteresis in current–voltage (J–V) characteristics perovskite solar cells. We investigate interplay between ionic conduction and types by studying Cs0.05(FA0.83MA0.17)0.95Pb(I0.9Br0.1)3 triple-cation cells through a combination impedance spectroscopy (IS) sweep-rate-dependent J–V curves. By comparing polycrystalline devices single-crystal MAPbI3 devices, we separate two defects, β γ, both originating from long-range bulk....
The properties of charged point defects in semiconductors such as metal halide perovskites play a critical role the efficiency and stability solar cells. Still, formation migration enthalpies well entropies ionic have not yet been determined experimentally. Through impedance spectroscopy, along with quantification defect properties, we demonstrate an approach to obtain ion entropy changes different perovskite thin films. We investigate lead-based that contain cations (Cs, methylammonium...