El-Zohry, Ahmed M.
Mohammed, Omar F.
KAUST DepartmentChemical Science Program
Functional Nanomaterials Lab (FuNL)
KAUST Catalysis Center (KCC)
KAUST Solar Center (KSC)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
Online Publication Date2018-02-23
Print Publication Date2018-03-22
Permanent link to this recordhttp://hdl.handle.net/10754/627632
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AbstractAlthough ligands of long carbon chains are very crucial to form stable colloidal perovskite nanocrystals (NCs), they create a severe barrier for efficient charge injection or extraction in quantum-dot-based optoelectronics, such as light emitting diode or solar cell. Here, we report a new approach to preparing ligand-free perovskite NCs of CsPbBr, which retained high photoluminescence quantum yield (44%). Such an approach involves a polar solvent (acetonitrile) and two small molecules (ammonium acetate and cesium chloride), which replace the organic ligand and still protect the nanocrystals from dissolution. The successful removal of hydrophobic long ligands was evidenced by Fourier transform infrared spectroscopy, ζ potential analysis, and thermogravimetric analysis. Unlike conventional perovskite NCs that are extremely susceptible to polar solvents, the ligand-free CsPbBr NCs show robust resistance to polar solvents. Our ligand-free procedure opens many possibilities not only from a material hybridization perspective but also in optimizing charge injection and extraction in semiconductor quantum-dot-based optoelectronics applications.
CitationZhang Y, Sinatra L, Alarousu E, Yin J, El-Zohry AM, et al. (2018) Ligand-Free Nanocrystals of Highly Emissive Cs4PbBr6 Perovskite. The Journal of Physical Chemistry C 122: 6493–6498. Available: http://dx.doi.org/10.1021/acs.jpcc.8b01735.
SponsorsThis work was financially supported by King Abdullah University of Science and Technology (KAUST).
PublisherAmerican Chemical Society (ACS)