The realization of efficient tandem cells necessitates the combination of subcells with well adapted optical and optoelectronic properties. Even though high
efficiencies have now been realized with perovskite-based solar cells, we are far from a detailed understanding of how photovoltaic parameters are related to the chemical structure and
the morphology of the active material. Moreover, the picture on the charge carrier dynamics and the electron-photon coupling in these systems is far from being complete.
The aim of the thesis work is to perform an in-depth experimental investigation of the electron and photon dynamics in perovskite-based solar cells,
utilizing state of the art pump-probe techniques. These studies will yield valuable information about the mechanisms which dictate the efficiency of charge carrier generation and
extraction. With samples of well-defined composition and structure being supplied by the collaborators, we aim at establishing conclusive structure-property relationships. The outcome of
these studies will allow for a knowledge-guided fine-tuning of the photovoltaic properties of these cells.
The possible applicant should be familiar with solid state spectroscopy, including the physics of phonons and electrons in semiconducting materials.