Direct and Post-Synthetic Modifications of Organic and Inorganic Halide Perovskites
Open Access
- Author:
- Geiger, Melanie Lian
- Area of Honors:
- Chemistry
- Degree:
- Bachelor of Arts
- Document Type:
- Thesis
- Thesis Supervisors:
- Raymond Edward Schaak, Thesis Supervisor
Raymond Lee Funk, Thesis Honors Advisor - Keywords:
- nanosynthesis
perovskites
halide perovskites
nanoparticle
cation exchange
anion exchange
nanocube - Abstract:
- Halide perovskites have emerged as a new family of light absorbing materials thought to have great potential in photovoltaics and other semiconductor devices, with methyl ammonium lead iodide (MAPbI3) being the most heavily discussed perovskite in literature. Because MAPbI3is so commonly researched, thisthesis focuses on expanding the perovskite family and building new capabilities into existing systems. Like most perovskites, MAPbI3is highly unstable upon exposure to moisture and air, so synthesizingnew perovskite compounds with improved stability and propertiesby performing both direct and post-synthetic transformations to pre-existing structures is a main objective for this research project. During the first half of the project, large perovskite structures including layered fluorophenylammonium methylammonium lead iodide ((FPEA)2PbI4, (FPEA)2(MA)Pb2I7, (FPEA)(MA)Pb3I10) andbutylamine methylammonium lead iodide ((BA)2(MA)2Pb3I10) were successfully synthesized from literature examples.1,2The layered perovskites werethen altered by incorporating pyridine and methylacrylamideto improve the compounds’stability. Later, research became focused on nanoparticle perovskite synthesis, and CsPbBr3and CsPbCl3were successfully synthesized according to literature examples.3Attempts at metal growth on these existing cesium compoundswerethenperformed using platinum, gold, and palladiumnanoparticles. The perovskites were also explored for useincation exchange reactions and further attempts at metal growth usingmetal chloride salts including Au+3, Cu+1, Cu+2, and Ni+2.