Influence of Oxygen Ion Migration from Substrates on Photochemical Degradation of CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> Hybrid Perovskite
Ivan S. Zhidkov,
Azat F. Akbulatov,
Liana N. Inasaridze,
Andrey I. Kukharenko,
Lyubov A. Frolova,
Seif O. Cholakh,
Chu-Chen Chueh,
Pavel A. Troshin,
Ernst Z. Kurmaev
Affiliations
Ivan S. Zhidkov
Institute of Physics and Technology, Ural Federal University, Mira St. 19, 620002 Yekaterinburg, Russia
Azat F. Akbulatov
Institute for Problems of Chemical Physics, The Russian Academy of Sciences (IPCP RAS), Semenov Prospect 1, 141432 Chernogolovka, Russia
Liana N. Inasaridze
Institute for Problems of Chemical Physics, The Russian Academy of Sciences (IPCP RAS), Semenov Prospect 1, 141432 Chernogolovka, Russia
Andrey I. Kukharenko
Institute of Physics and Technology, Ural Federal University, Mira St. 19, 620002 Yekaterinburg, Russia
Lyubov A. Frolova
Institute for Problems of Chemical Physics, The Russian Academy of Sciences (IPCP RAS), Semenov Prospect 1, 141432 Chernogolovka, Russia
Seif O. Cholakh
Institute of Physics and Technology, Ural Federal University, Mira St. 19, 620002 Yekaterinburg, Russia
Chu-Chen Chueh
Advanced Research Center for Green Materials Science and Technology, Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
Pavel A. Troshin
Institute for Problems of Chemical Physics, The Russian Academy of Sciences (IPCP RAS), Semenov Prospect 1, 141432 Chernogolovka, Russia
Ernst Z. Kurmaev
Institute of Physics and Technology, Ural Federal University, Mira St. 19, 620002 Yekaterinburg, Russia
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, indium tin oxide (ITO), and TiO2) aged under different light-soaking conditions at room temperature are presented. The results reveal that the photochemical stability of MAPbI3 depends on the type of substrate and gradually decreases when glass is replaced by ITO and TiO2. Also, the degradation upon exposure to visible light is accompanied by the formation of MAI, PbI2, and Pb0 products as shown by XPS core levels spectra. According to XPS O 1s and VB spectra measurements, this degradation process is superimposed on the partial oxidation of lead atoms in ITO/MAPbI3 and TiO2/MAPbI3, for which Pb–O bonds are formed due to the diffusion of the oxygen ions from the substrates. This unexpected interaction leads to additional photochemical degradation.
