Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
Efficient and stable perovskite solar cells rely on the use of water-soluble Pb2+ species potentially challenging the technologies’ commercialisation. In this study, the environmental fate of perovskite-based Pb2+ species is evaluated in soil-water microcosm experiments, simulating worst-case leaching from the solar cells under various biogeochemical conditions. The rapid and efficient removal of Pb2+ from the aqueous phase is demonstrated by inductively coupled plasma mass spectrometry. Sequential soil extraction results reveal that a substantial amount of Pb2+ is naturally immobilised, while a minor proportion of Pb2+ may become available again in the long term, when oxygen is depleted. X-ray absorption spectroscopy results reveal that the sorption of Pb2+ on mineral phases (such as birnessite-type MnO2) represents the most likely sequestration mechanism. The obtained results suggest that the availability of leached Pb2+ from perovskite solar cells is naturally limited in soils and that its adverse effects on soil biota are probably negligible in oxic soils.
This project has received funding from the European Union’s Horizon 2020 framework program for research and innovation under grant agreement no 763977 of the PerTPV project.
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