Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
In this poster we report on the influence of light and oxygen on the stability of CH3NH3PbI3 perovskite based photoactive layers. [1] When exposed to both light and dry air the mp-Al2O3/CH3NH3PbI3 photoactive layers 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 pervoskite 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 a mp-TiO2 electron. 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.
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