Date of Award
Doctor of Philosophy
Chemical and Biological Engineering
Matthew G. Panthani
This dissertation is a broad overview of research in the field of lead-free perovskite
inspired materials. While lead halide perovskites have promising properties, we sought to
investigate non-toxic alternatives – typically ones containing bismuth halides. We looked
into the flexibility of this element to be produced on different length scales, fabricating films
from bulk material, synthesizing nanocrystals, and growing crystals of 2D layered double
perovskites. We discovered that due to complexation with a solvent, bismuth iodide films can
be morphology controlled through use of solvent additives. During our synthesis of Cs3Bi2X9
nanocrystals, we found that BiX3 precursors possessed photoluminescence and that treatment
of these seeds was crucial to the end product of the reaction. We investigate layered double
perovskites containing bismuth and found that these materials have a structural transition and
a thermochromic behavior. Further, we determine that these double perovskites can be
processed into nanocrystals through sonication. Finally, we investigated the aforementioned
Bi seeds to determine methods of controlling the morphology and processability of the seeds,
finding that changing an alkylammonium ligand helps direct some amount of self-assembly.
We conclude that bismuth based materials have many interesting properties that encourage
future investigation into bismuth halides.
Rainie Dean Nelson
Nelson, Rainie Dean, "Solution phase synthesis of lead-free perovskite and perovskite-inspired materials" (2019). Graduate Theses and Dissertations. 17526.