Ligand-Free Nanocrystals of Highly Emissive Cs4PbBr6 Perovskite

Yuhai Zhang, Lutfan Sinatra, Erkki Alarousu, Jun Yin, Ahmed M. El-Zohry, Osman Bakr, Omar F. Mohammed

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

Although 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.
Original languageEnglish (US)
Pages (from-to)6493-6498
Number of pages6
JournalThe Journal of Physical Chemistry C
Volume122
Issue number11
DOIs
StatePublished - Feb 23 2018

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