Hydration and dehydration of photovoltaic methylammonium lead iodide
Methylammonium lead iodide (MAPI) perovskite has generated frenzied interest in the field of alternative photovoltaics as a promising material for achieving the paradigm of the technology: simplicity of processing combined with outstanding optoelectronic properties. MAPI is sensitive to moisture, which may have both detrimental and beneficial effects depending on the context. We have recently studied this hydration behavior using powder X-ray diffraction and observed the formation of the monohydrate phase CH3NH3PbI3•H2O but much of the process occurring takes place at the grain boundaries inside the bulk and film materials and is not observed via X-ray diffraction methods . This experiment will study the key phases found and produced in the MAPI-water reaction, initially as the bulk material (to fully elucidate structures including H-positions and bonding) and then to investigate the hydration/ dehydration of these materials both as bulk phases and then in situ as typical PV films. Crystallographic experiments will employ D20 in higher resolution mode and in situ experiments will use high flux mode to milligram quantities of these heavy metal iodide phases on thin film plates.
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WELLER Mark T.; Thomas C. Hansen; HENRY Paul; MARSHALL Kayleigh and Oliver Jacob Weber. (2015). Hydration and dehydration of photovoltaic methylammonium lead iodide. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-567
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