Date of Award
Master of Science
Emily A. Smith
Photostability is important for current organometal halide perovskites being used as materials in light emitting devices, lasers, quantum dots and solar cells. Illumination from different sources such as the sun, lamps, and lasers can alter the physical and PL stability of nanocrystalline perovskites. This instability can be problematic for the use of perovskite quantum dots as molecular probes and lead to deterioration of perovskite-based solar cells. Here, different synthetic pathways are being analyzed using luminescence microscopy to determine the most stable method(s) for preparing physically and PL λmax stable MA lead halide perovskite nanocrystals. Dimensionality is controlled by capping with octylammonium ligands. Two different precursor ratios are evaluated to determine which provide the highest photostability. It is determined that the 1:1.5:1.5 PbX2:CH3NH3X:CH3(CH2)7X precursor ratio provides the most photo-stable MA lead halide perovskite nanocrystals.
Daniel J Freppon
Freppon, Daniel J., "Understanding the photophysical properties of methylammonium lead halide perovskites" (2019). Graduate Theses and Dissertations. 17014.