The field of organometal halide perovskites has exploded within the past few years as 20 percent energy conversion rates have been achieved with organolead halide perovskites among top performing semiconductors in photovoltaic devices. For this study, colloidal methylammonium lead iodide (CH3NH3PbI3) perovskites were synthesized and doped with antimony utilizing a one-step precursor solution deposition method in which doped perovskites were precipitated from polar precursor solutions using nonpolar solvents. Bulk crystals were then synthesized and compared to the colloidal nanocrystals. The morphology and properties of nanosized (~50nm) crystals were tested with the addition of n-octylammonium iodide in the precursor solution used to terminate crystal growth at the desired size. The results of the experiment were tested using x-ray diffraction (XRD), transmission emission microscopy (TEM), diffuse reflectance, and photoluminescence. The doped nanoparticles produced an increase in photoluminescence (Pl) over the bulk materials. This method also prevents the binding of long-chain organic ligands to the crystal surface that inhibit surface charge transport. These materials could prove useful in light emitting diodes (LEDs) and photo-electronic devices.

Antimony doped organo-lead halide perovskite nanocrystals

251st National Meeting (2016)

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