Conveners
Engineering: Photovoltaics and Radiation Sensors
- Martin Meven (RWTH Aachen University, Institute of Crystallography - Outstation at MLZ)
Lead halide perovskites have shown excellent optoelectronic properties, yet they are sensitive and unstable under humidity. Herein, we did an in-situ humidity X-ray scattering study to unravel the intermediate and final degradation phases of cesium-formamindinium lead halide perovskites. It was observed that the origins of phase transitions in lead halide perovskites go beyond humidity: the...
Compound semiconductors with a high absorption coefficient are the most advanced and most efficient absorber materials in thin film photovoltaic (PV) technologies. Highly efficient devices are based on absorber layers from ternary or quaternary chalcogenides or hybrid halide perovskites. The crystal structures of these materials are based on corner sharing building blocks: tetrahedra...
Alternative photovoltaic absorbers often suffer from scarce and/or toxic components. Herein, we look at the model system Zn$_{1+x}$Ge$_{1-x}$(O$_x$N$_{1-x}$)$_2$, which we studied in detail using Neutron diffraction, chemical analyses and UV-VIS measurements. We show that two independent ways of cation disorder exist: one related to the chemical composition and one based on antisite defects....
Kesterite-type based thin film solar cell technologies are mainly based on polycrystalline absorber layers. A promising low cost alternative technology uses Cu$_{2}$ZnSn(S,Se)$_{4}$ (CZTSSe) monograins (single crystals of 50-100 μm size) fixed in a polymer matrix to form a flexible solar cell.
In this study we tackle the influence of grinding the monograins on the stoichiometry deviation, the...
