Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
It has been proposed that halide defect states determine the photoinduced ionic dynamics of metal-halide perovskites, including molecular iodine formation and removal, and consequent perovskite degradation.[1–3] Conversely, it has been suggested that the volatility of methylammonium (MA) is the primary component compromising MA-based perovskite devices.[4] In this study, we investigate the effect of photoinduced ion migration from metal halide perovskites upon commonly used electron and hole transport layer (ETL/HTL) materials and the perovskite itself. By placing the separate perovskite and TL films together under illumination, we allow species to photomigrate from the perovskite to the TL films, whilst still able to independently probe the films. Through optical, vibrational, chemical and electrical measurements, we propose a degradation pathway and identify the most critical ionic species upon perovskite device stability.
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 764787.
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