Investigation of CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> Degradation Rates and Mechanisms in Controlled Humidity Environments Using <i>in Situ</i> Techniques
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Abstract
Perovskite solar cells have rapidly advanced to the forefront of solution-processable photovoltaic devices, but the CH3NH3PbI3 semiconductor decomposes rapidly in moist air, limiting their commercial utility. In this work, we report a quantitative and systematic investigation of perovskite degradation processes. By carefully controlling the relative humidity of an environmental chamber and using in situ absorption spectroscopy and in situ grazing incidence X-ray diffraction to monitor phase changes in perovskite degradation process, we demonstrate the formation of a hydrated intermediate containing isolated PbI6(4-) octahedra as the first step of the degradation mechanism. We also show that the identity of the hole transport layer can have a dramatic impact on the stability of the underlying perovskite film, suggesting a route toward perovskite solar cells with long device lifetimes and a resistance to humidity.
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The record
- Venue
- ACS Nano
- Topic
- Perovskite Materials and Applications
- Field
- Engineering
- Canadian institutions
- University of Saskatchewan
- Funders
- Natural Sciences and Engineering Research Council of CanadaCanada Research Chairs
- Keywords
- Perovskite (structure)Materials scienceRelative humidityDegradation (telecommunications)HumiditySemiconductorSolar cellIn situPhotovoltaic systemChemical engineeringX-ray absorption spectroscopyAbsorption spectroscopyOptoelectronicsOpticsChemistryElectronic engineering
- Has abstract in OpenAlex
- yes