Influence of Oxygen Ion Migration from Substrates on Photochemical Degradation of CH3NH3PbI3 Hybrid Perovskiteстатья
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Аннотация:Measurements of XPS survey, core levels (N 1s, O 1s, Pb 4f, I 3d), and valence band (VB)spectra of CH3NH3PbI3 (MAPbI3) hybrid perovskite prepared on different substrates (glass, indiumtin oxide (ITO), and TiO2) aged under different light-soaking conditions at room temperature arepresented. The results reveal that the photochemical stability of MAPbI3 depends on the type ofsubstrate and gradually decreases when glass is replaced by ITO and TiO2. Also, the degradationupon exposure to visible light is accompanied by the formation of MAI, PbI2, and Pb0 productsas shown by XPS core levels spectra. According to XPS O 1s and VB spectra measurements, thisdegradation process is superimposed on the partial oxidation of lead atoms in ITO/MAPbI3 andTiO2/MAPbI3, for which Pb–O bonds are formed due to the diffusion of the oxygen ions from thesubstrates. This unexpected interaction leads to additional photochemical degradation.