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Correction: Transforming colloidal Cs4PbBr6 nanocrystals with poly(maleic anhydride-alt-1-octadecene) into stable CsPbBr3 perovskite emitters through intermediate heterostructures

Dmitry Baranov*a, Gianvito Caputoa, Luca Goldonib, Zhiya Danga, Riccardo Scarfielloc, Luca De Trizioa, Alberto Portoned, Filippo Fabbrid, Andrea Camposeod, Dario Pisignanode and Liberato Manna*a
aNanochemistry Department, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy. E-mail: dmitry.baranov@iit.it; liberato.manna@iit.it
bAnalytical Chemistry Lab, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
cCNR NANOTEC, Institute of Nanotechnology, c/o Campus Ecotecne, via Monteroni, 73100 Lecce, Italy
dNEST, Istituto Nanoscience-CNR, Piazza S. Silvestro 12, I-56127 Pisa, Italy
eDipartimento di Fisica “Enrico Fermi”, Università di Pisa, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy

Received 11th June 2020 , Accepted 11th June 2020

First published on 18th June 2020


Correction for ‘Transforming colloidal Cs4PbBr6 nanocrystals with poly(maleic anhydride-alt-1-octadecene) into stable CsPbBr3 perovskite emitters through intermediate heterostructures’ by Dmitry Baranov et al., Chem. Sci., 2020, 11, 3986–3995, DOI: 10.1039/D0SC00738B.


After the publication of our manuscript, an inquiry from a reader pointed out an earlier publication that was not cited in the context of prior art relevant to our study. We thank the reader for their interest in our work. Prompted by the inquiry, we thought it would be appropriate to acknowledge a few earlier and relevant publications that escaped our attention.

De Matteis et al.1 have reported room temperature excitation–emission maps (photoluminescence maps) of powders containing a mixture of Cs4PbBr6 and CsPbBr3 compounds (Fig. 9 and 10 in ref. 1). The photoluminescence maps show a dip at around ∼314 nm in the excitation spectrum of the CsPbBr3 compound emitting at ∼520 nm. The dip matches the wavelength of the electronic absorption in Cs4PbBr6. In a similar vein, Shin et al.2 have reported room temperature photoluminescence maps of CsBr/PbBr2 co-evaporated thin films containing a mixture of CsPbBr3 and Cs4PbBr6 compounds. In a photoluminescence map shown in Fig. 5b of ref. 2, the emission of the CsPbBr3 compound at ∼517 nm is quenched at the excitation wavelength of ∼318 nm, consistent with absorption by Cs4PbBr6. Both De Matteis et al.1 and Shin et al.2 observed an additional room temperature UV emission at ∼375 nm and ∼360 nm, respectively, from the mixed CsPbBr3–Cs4PbBr6 samples and assigned it to Cs4PbBr6.

The room temperature photoluminescence maps of Cs4PbBr6–CsPbBr3 heterostructured nanocrystals studied in our work (Fig. 4a)3 show a qualitatively similar dip in the intensity of ∼504 nm emission from CsPbBr3 when excited at ∼314 nm, the absorption wavelength of Cs4PbBr6. In contrast to the above-mentioned observations, Cs4PbBr6–CsPbBr3 heterostructured nanocrystals were not emissive in UV at room temperature but showed a weak ∼376 nm emission from Cs4PbBr6 only when cooled down to ∼35 K (Fig. 4b).3 The three studies share similar photoluminescence measurements and chemical formulas of the studied compounds. However, the synthetic origins and structures of the samples, together with discussions of the observed phenomena, are different in the three studies.

Krieg et al.4 have reported effective colloidal stabilization of CsPbBr3 nanocrystals over a wide range of concentrations, from 400 mg ml−1 to 4 × 10−6 mg ml−1 of inorganic content in toluene (Fig. 2 in ref. 4) by means of lecithin, a naturally occurring zwitterionic ligand. The lecithin-stabilized nanocrystals have been reported to be stable against multiple rounds of washing, i.e., precipitation–redispersion with an antisolvent. The poly(maleic anhydride-alt-1-octadecene) compound (PMAO) used in our work to transform Cs4PbBr6 nanocrystals into CsPbBr3 nanocrystals yielded colloids of PMAO-capped CsPbBr3 nanocrystals which survive several rounds of washing and are stable in the concentration range of ∼26 mg ml−1 to ∼1 × 10−4 mg ml−1 (Fig. S32). It is notable that both lecithin and PMAO increase the colloidal stability of CsPbBr3 nanocrystals despite an apparently different surface binding chemistry and a different way of being introduced into the nanocrystal preparation.

The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers.

References

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