- 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
- Download Statistik1162
- 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.
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