Reactive interfaces: perovskite degradation at metal-oxide interfaces probed by photoelectron spectroscopy

In optoelectronic devices, the function and performance depends crucially on the proper alignment of the energy level landscape throughout the device, allowing for efficient charge transport across the various interfaces. In perovskites it turned out that these interfaces can be rather complex. On the one hand, interface dipoles and band bending occur. But more importantly, the perovskite composition and formation can be significantly influenced by chemical reactions taking place at these interfaces. In this talk I will summarize our recent work on a variety of metal-oxides in which we use photoelectron spectroscopy to analyze which components are responsible for the strong interface chemistry. For this, we looked at a variety of different perovskites (i.e. organic vs. inorganic ones, I vs. Br, etc.) as well as the individual perovskite precursors. Overall, I will show how photoelectron spectroscopy measurements can help to probe and understand the processes going on at these vario