TY - JOUR
T1 - Ligand-Free Nanocrystals of Highly Emissive Cs4PbBr6 Perovskite
AU - Zhang, Yuhai
AU - Sinatra, Lutfan
AU - Alarousu, Erkki
AU - Yin, Jun
AU - El-Zohry, Ahmed M.
AU - Bakr, Osman
AU - Mohammed, Omar F.
N1 - KAUST Repository Item: Exported on 2020-04-23
Acknowledgements: This work was financially supported by King Abdullah University of Science and Technology (KAUST).
PY - 2018/2/23
Y1 - 2018/2/23
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/627632
UR - https://pubs.acs.org/doi/10.1021/acs.jpcc.8b01735
UR - http://www.scopus.com/inward/record.url?scp=85044456371&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.8b01735
DO - 10.1021/acs.jpcc.8b01735
M3 - Article
AN - SCOPUS:85044456371
VL - 122
SP - 6493
EP - 6498
JO - The Journal of Physical Chemistry C
JF - The Journal of Physical Chemistry C
SN - 1932-7447
IS - 11
ER -