We are an interdisciplinary group of scanning force microscopy (SFM) enthusiasts, constantly exploring the limits of this fascinating microscopy method. The goal is to understand the underlying physics of nanoscale systems. One focus is on novel photovoltaic materials and devices (so-called perovskite solar cells). Here we developed new methods to study the potential distribution across the different layers of a operating solar cell device. Furthermore, we were the first to report the existence of ferro-elastic domains in perovskite films.