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Abstract
In this paper we report on the influence of light and oxygen on the stability of CH3NH3PbI3 perovskite-based photoactive layers. When exposed to both light and dry air the mp-Al2O3/CH3NH3PbI3 photoactive layers rapidly decompose yielding methylamine, PbI2, and I2 as products. We show that this degradation is initiated by the reaction of superoxide (O2−) with the methylammonium moiety of the perovskite absorber. Fluorescent molecular probe studies indicate that the O2− species is generated by the reaction of photoexcited electrons in the perovskite and molecular oxygen. We show that the yield of O2− generation is significantly reduced when the mp-Al2O3 film is replaced with an mp-TiO2 electron extraction and transport layer. The present findings suggest that replacing the methylammonium component in CH3NH3PbI3 to a species without acid protons could improve tolerance to oxygen and enhance stability.
Originalsprache | englisch |
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Seiten (von - bis) | 8208-8212 |
Fachzeitschrift | Angewandte Chemie - International Edition |
Jahrgang | 54 |
Ausgabenummer | 28 |
DOIs | |
Publikationsstatus | Veröffentlicht - 2015 |
Fields of Expertise
- Advanced Materials Science
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- 1 Abgeschlossen
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FWF - ChemInTHS - Chemische Grenzflächenmodifikation in Hybridsolarzellen
1/12/15 → 31/12/16
Projekt: Forschungsprojekt