Hauptmenü
  • Autor
    • Aristidou, Nicholas
    • Sanchez-Molina, Irene
    • Chotchuangchutchaval, Thana
    • Brown, Michael
    • Martinez, Luis
    • Rath, Thomas
    • Haque, Saif A.
  • TitelThe Role of Oxygen in the Degradation of Methylammonium Lead Trihalide Perovskite Photoactive Layers
  • Datei
  • DOI10.1002/anie.201503153
  • Erschienen inAngewandte Chemie
  • Band54
  • Erscheinungsjahr2015
  • Heft28
  • Seiten8208-8212
  • ZugriffsrechteCC-BY
  • Download Statistik111
  • Peer ReviewNein
  • AbstractIn this paper we report on the influence of light and oxygen on the stability of \(CH_3NH_3PbI_3\) perovskite-based photoactive layers. When exposed to both light and dry air the \(mp-Al_2O_3/CH_3NH_3PbI_3\) photoactive layers rapidly decompose yielding methylamine, \(PbI_2\), and \(I_2\) as products. We show that this degradation is initiated by the reaction of superoxide \((O_2^−)\) with the methylammonium moiety of the perovskite absorber. Fluorescent molecular probe studies indicate that the \(O_2^−\) species is generated by the reaction of photoexcited electrons in the perovskite and molecular oxygen. We show that the yield of \(O_2^−\) generation is significantly reduced when the \(mp-Al_2O_3\) film is replaced with an \(mp-TiO_2\) electron extraction and transport layer. The present findings suggest that replacing the methylammonium component in \(CH_3NH_3PbI_3\) to a species without acid protons could improve tolerance to oxygen and enhance stability.