The research and development of Lead Halide perovskite solar cells are one of the most rapidly growing research areas. Since the discovery of these organic-inorganic metal halide perovskite solar cells in 2009, the devices have shown great promise, with efficiency up to over 23% in 2017. One of the main issues still to be solved is the degradation of the devices. To do this further research is being carried out to understand the mechanisms behind inorganic-organic hybrid solar cells. This proposal aims to study the hybrid material formamidinium lead iodide (NH2-CH2=NH2PbI3) (FALI) using muons to understand the relaxation within two different forms as a function of temperature. This will help with the further development of these solar cells.