| Summary: | 碩士 === 國立臺灣師範大學 === 化學系 === 105 === Perovskite nanocrystals have a good application in solar cells and light-emitting diodes because of their optical properties such as high absorption coefficient, bipolar, direct energy gap and so on, so they become one of the most popular luminescent materials , But because of its low stability in the atmosphere, resulting in its practical application of the difficulties. This study is mainly for the stability of this material. This kind of material in the atmosphere due to the intrusion of water and oxygen to its crystal disintegration, but its own high optical activity crystal phase at room temperature also, will spontaneous conversion Non-optically active crystal phase, so that it lost the value of application. In this study, the use of ligand replacement, the original oleic acid as the main ligand of the perovskite nanocrystals, replaced by small molecules of hexamethyldisilane, improved its stability in the atmosphere, from Visible light absorption spectroscopy, X-ray diffraction spectroscopy, transmission electron microscopy, fluorescence emission spectroscopy, etc. The observed optical properties of perovskite nanocrystals with hexamethyldisilane as ligand Which is more stable than the perovskite nanocrystals with oleic acid as ligand, which indicates that this method enhances the stability of the optically active cubic crystal phase of perovskite nanocrystals in the atmosphere to optimize its application.
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