Composition-Dependent Degradation of Hybrid and Inorganic Lead Perovskites in Ambient Conditions

Nel presente manoscritto viene investigata la stabilità di perovskiti ibride ed inorganiche a base MPbBr3, preparate per sintesi chimica. L'evoluzione composizionale e strutturale dei materiali sintetizzati è stata valutata mediante diffrazione X, microscopia elettronica ed a forza atomica ed XPS in funzione del tempo di esposizione in camera climatica a temperatura ed umidità controollata. In this paper, we investigated the stability of different bromine-based perovskites; hybrid, MAPbBr3 (MA: NH3CH3+) and inorganic, CsPbBr3 and RbPbBr3. The samples were prepared via single-step solution synthesis as thin films on Au/Pd coated glass substrates and the degradation process was carried out in a climatic chamber at 50 °C and 75 %RH humidity. The structural and chemical evolution of the perovskites were evaluated as function of the exposure time by means of AFM, and AR-XPS, while their optoelectronic properties were monitored by indirect bandgap measurement.