On the Optimization of Neutron-Reflectometry Experiments on Thin Films of Hybrid Perovskites for Photovoltaics

Hybrid perovskite materials based on metal-organic structures attract considerable attention because they achieve a relatively high conversion of solar radiation into photocurrent while being relatively simple to produce. This study presents a model analysis of the possibility for the experimental detection and characterization of a lead-halide layer that forms at the internal interface during the degradation of a hybrid perovskite photovoltaic film, using in situ neutron reflectometry. By comparing calculated specular-reflection curves, we identify the relationships between the parameters of the system's components that allow us, despite generally minor changes in the curves, to trace to a certain extent the evolution of the mentioned layer.