<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Exploration of Properties, Stability and\r\nReproducibility of Perovskite Solar Cells"^^ . "The first part of this thesis was aimed at understanding the role of microstructure in\r\nthe material degradation rate of polycrystalline methylammonium lead iodide perovskite\r\n(MAPbI3) films under controlled exposure to oxygen and simulated sunlight. It was ascertained\r\nthat MAPbI3 films consisting of small and irregularly ordered crystal grains degrade\r\nmuch more rapidly when compared to films consisting of large, regularly ordered\r\ngrains. Microstructural analysis revealed that the degradation rate varies widely across a\r\nfilm and commences at the grain boundaries, which suggests that degradation in MAPbI3\r\nfilms stems from a spatially varying density of defects. The second part of this thesis aimed\r\nat understanding reproducibility issues by exploring the effect of fractional variations in\r\nthe precursor solution stoichiometry, which is used for MAPbI3 film fabrication. Despite\r\nonly minor changes in microstructure, such variations showed a strong effect on the surface\r\ncomposition and energetics of MAPbI3 films, as well as the photovoltaic parameters and\r\nstability of solar cell devices. Steady-state and time-resolved photoluminescence measurements under various atmospheres revealed strong heterogeneities in the material properties depending on the exact stoichiometry. Taken together, these results reveal the low tolerance\r\nof perovskite materials towards oxygen exposure, as well as towards small variations in precursor stoichiometry, and partly explain the discrepancies and irreproducibility commonly encountered in perovskite research."^^ . "2019" . . . . . . . "Paul"^^ . "Faßl"^^ . "Paul Faßl"^^ . . . . . . "Exploration of Properties, Stability and\r\nReproducibility of Perovskite Solar Cells (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Exploration of Properties, Stability and\r\nReproducibility of Perovskite Solar Cells (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Exploration of Properties, Stability and\r\nReproducibility of Perovskite Solar Cells (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Exploration of Properties, Stability and\r\nReproducibility of Perovskite Solar Cells (Other)"^^ . . . . . . "small.jpg"^^ . . . "Exploration of Properties, Stability and\r\nReproducibility of Perovskite Solar Cells (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Exploration of Properties, Stability and\r\nReproducibility of Perovskite Solar Cells (PDF)"^^ . . . "Dissertation2018_PaulFassl.pdf"^^ . . "HTML Summary of #25787 \n\nExploration of Properties, Stability and \nReproducibility of Perovskite Solar Cells\n\n" . "text/html" . . . "530 Physik"@de . "530 Physics"@en . .