Synthesis and Temperature-Dependent Optical Properties of CsPbX3 (X=C1, Br, I) Nanoctystals: Towards Water Soluble Perovskite Nanocrystals
Sherwood, Caleb C.
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Lead-halide based perovskites and perovskite nanocomposites have witnessed exponential growth in research attention largely because of their promising applications in solar cells, light emitting diodes and biological imaging. All inorganic CsPbX3nanocrystals show luminescence in the visible region ranging from 420-700 nm, based on the composition and temperature of the synthesis of the halide. To develop robust perovskite nanocomposites for applications in optoelectronic processes, several fundamental questions must be understood, such as the influence of temperature and passivation on the optical properties. This study is aimed at understanding the influence of temperature and photo-passivation on the optical properties of perovskite nanocrystals, as well as to develop strategies to synthesize perovskite nanocrystals that maintain their optical properties and are soluble in water. To achieve the objectives, CsPbX3 (X = Cb, CbBr, ClBr2,Bn, Bnh Brh, I3) were synthesized using a hot injection method. Optical absorption and steady-state PL measurements were used to identify perovskite nanocomposites. Temperature dependent studies shows that inhomegeneities in nanocrystals are more pronounced at higher temperatures. Photo-passivation experiments suggest that the initial photopassivation reduced the non-radiative deactivation. While the PL intensity of CsPbBn NC decreased with increased time when they are in the presence of block copolymers. In addition, synthesis of CsPbBr3 nanocrystals were carried out while adding block copolymers during the synthesis that yielded CsPbBr3 nanocrystals that are soluble in polar solvents without significant changes in PL properties.