New insights into the nanostructure of innovative thin film solar cells gained by positron annihilation spectroscopy

On the effect of atomic layer deposited Al2O3 on the environmental degradation of hybrid perovskite probed by positron annihilation spectroscopy

“…48 Another study by Eijt et al applied DB-PAS to monitor the ambient stability of CsPbBr 3 -based perovskite for 5 months in the dark, in which no significant changes in the open volumes were observed. 49 This was in accordance with the well-known fact that CsPbBr 3 perovskite is comparatively more stable than the conventional CH 3 NH 3 PbI 3 perovskite in ambient conditions, primarily because of the absence of the CH 3 NH 3 + component in its lattice structure. 50 In the present work, we use DB-PAS to gain insights into the behavior of the structural degradation of CH 3 NH 3 PbI 3Àx Cl x perovskite films under exposure to ambient air (relative humidity of 40 to 55%) at room temperature, in particular in view of the evolution of structural defects (open volumes) and chemical changes in the perovskite films.…”