Projects per year
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.
Original language | English |
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Pages (from-to) | 8208-8212 |
Journal | Angewandte Chemie - International Edition |
Volume | 54 |
Issue number | 28 |
DOIs | |
Publication status | Published - 2015 |
Fields of Expertise
- Advanced Materials Science
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Dive into the research topics of 'The role of oxygen in the degradation of methylammonium lead trihalide perovskite photoactive layers'. Together they form a unique fingerprint.Projects
- 1 Finished
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FWF - ChemInTHS - Chemical Interface Tailoring in Hybrid Solar Sells
1/12/15 → 31/12/16
Project: Research project