Controlling homogenous spherulitic crystallization for high-efficiency planar perovskite solar cells fabricated under ambient high-humidity conditions

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dc.contributor.authorAngmo, Dechan
dc.contributor.authorPeng, Xiaojin
dc.contributor.authorSeeber, Aaron
dc.contributor.authorZuo, Chuantian
dc.contributor.authorGao, Mei
dc.contributor.authorHou, Qicheng
dc.contributor.authorYuan, Jian
dc.contributor.authorZhang, Qi
dc.contributor.authorCheng, Yi‐Bing
dc.contributor.authorVak, Doojin
dc.date.accessioned2020-01-14T19:26:01Z
dc.date.available2020-01-14T19:26:01Z
dc.date.issued2019-10-25
dc.description.abstractThe influence of precursor solution properties, fabrication environment, and antisolvent properties on the microstructural evolution of perovskite films is reported. First, the impact of fabrication environment on the morphology of methyl ammonium lead iodide (MAPbI3) perovskite films with various Lewis‐base additives is reported. Second, the influence of antisolvent properties on perovskite film microstructure is investigated using antisolvents ranging from nonpolar heptane to highly polar water. This study shows an ambient environment that accelerates crystal growth at the expense of nucleation and introduces anisotropies in crystal morphology. The use of antisolvents enhances nucleation but also influences ambient moisture interaction with the precursor solution, resulting in different crystal morphology (shape, size, dispersity) in different antisolvents. Crystal morphology, in turn, dictates film quality. A homogenous spherulitic crystallization results in pinhole‐free films with similar microstructure irrespective of processing environment. This study further demonstrates propyl acetate, an environmentally benign antisolvent, which can induce spherulitic crystallization under ambient environment (52% relative humidity, 25 °C). With this, planar perovskite solar cells with ≈17.78% stabilized power conversion efficiency are achieved. Finally, a simple precipitation test and in situ crystallization imaging under an optical microscope that can enable a facile a priori screening of antisolvents is shown.en_UK
dc.identifier.citationAngmo D, Peng X, Seeber A, et al., (2019) Controlling homogenous spherulitic crystallization for high-efficiency planar perovskite solar cells fabricated under ambient high-humidity conditions. Small, Volume 15, Issue 49, December 2019, Article number 1904422en_UK
dc.identifier.issn1613-6810
dc.identifier.urihttps://doi.org/10.1002/smll.201904422
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/14922
dc.language.isoenen_UK
dc.publisherWiley-VCH Verlagen_UK
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.subjectAmbienten_UK
dc.subjectCrystallizationen_UK
dc.subjectPerovskiteen_UK
dc.subjectSpheruliteen_UK
dc.subjectPlanaren_UK
dc.titleControlling homogenous spherulitic crystallization for high-efficiency planar perovskite solar cells fabricated under ambient high-humidity conditionsen_UK
dc.typeArticleen_UK

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