Exploring the surface chemistry of cesium lead halide perovskite nanocrystals

Nanoscale ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 986-999 ◽  
Author(s):  
Roberto Grisorio ◽  
Milvia Elena Di Clemente ◽  
Elisabetta Fanizza ◽  
Ignazio Allegretta ◽  
Davide Altamura ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Surface Passivation ◽  
Organic Ligands ◽  
Perovskite Nanocrystals ◽  
Halide Perovskite ◽  
Lead Halide

The surface passivation by organic ligands of differently composed cesium lead halide perovskite nanocrystals was explored.

scholarly journals Surface Modification for Improving Photoredox Activity of CsPbBr3 Nanocrystals

2021 ◽  
Author(s):  
Syed Akhil ◽  
V.G.Vasavi Dutt ◽  
Nimai Mishra
Keyword(s):  
Surface Modification ◽  
Excited State ◽  
Surface Chemistry ◽  
Perovskite Nanocrystals ◽  
Inorganic Lead ◽  
Halide Perovskite ◽  
Photocatalytic Reactions ◽  
Lead Halide

In recent years inorganic lead halide perovskite nanocrystals (PNCs) have been used in photocatalytic reactions. The surface chemistry of the PNCs can play an important role in the excited state...

scholarly journals The Surface Chemistry and Structure of Colloidal Lead Halide Perovskite Nanocrystals

2021 ◽  
Vol 54 (3) ◽  
pp. 707-718
Author(s):  
Sara R. Smock ◽  
Yunhua Chen ◽  
Aaron J. Rossini ◽  
Richard L. Brutchey
Keyword(s):  
Surface Chemistry ◽  
Perovskite Nanocrystals ◽  
Halide Perovskite ◽  
Colloidal Lead ◽  
Surface Chemistry And Structure ◽  
Lead Halide

scholarly journals Transforming Colloidal Cs4PbBr6 Nanocrystals by Poly(maleic anhydride-alt-1-octadecene) into Stable CsPbBr3 Perovskite Emitters Through Intermediate Heterostructures

2020 ◽  
Author(s):  
Dmitry Baranov ◽  
Gianvito Caputo ◽  
Luca Goldoni ◽  
Zhiya Dang ◽  
Riccardo Scarfiello ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Cryogenic Temperature ◽  
Colloidal Stability ◽  
Surface Passivation ◽  
High Resolution Electron Microscopy ◽  
Dual Emission ◽  
Perovskite Nanocrystals ◽  
Resolution Electron ◽  
Halide Perovskite ◽  
Lead Halide

The preparation of strongly emissive CsPbBr<sub>3</sub> perovskite nanocrystals with a robust surface passivation is a challenge in the field of lead halide perovskite nanomaterials. We report an approach to prepare polymer-capped CsPbBr<sub>3</sub> perovskite nanocrystals by reacting oleylammonium/oleate-capped Cs<sub>4</sub>PbBr<sub>6</sub> nanocrystals with poly(maleic anhydride-alt-1-octadecene) (PMAO). PMAO contains succinic anhydride units that are reactive towards the oleylamine species present on Cs<sub>4</sub>PbBr<sub>6 </sub>nanocrystals’ surface and produces polysuccinamic acid, which, in turn, triggers the Cs<sub>4</sub>PbBr<sub>6</sub> to CsPbBr<sub>3 </sub>conversion. The transformation occurs through the formation of Cs<sub>4</sub>PbBr<sub>6</sub>-CsPbBr<sub>3</sub> heterostructures as intermediates, which were captured because of the mild reactivity of PMAO and were investigated by high-resolution electron microscopy. The Cs<sub>4</sub>PbBr<sub>6</sub>-CsPbBr<sub>3</sub> heterostructures demonstrate a dual emission at cryogenic temperature with an indication of the energy transfer from Cs<sub>4</sub>PbBr<sub>6</sub> to CsPbBr<sub>3</sub>. The fully-transformed CsPbBr<sub>3</sub> NCs have high photoluminescence quantum yield and enhanced colloidal stability, which we attribute to the adhesion of polysuccinamic acid to the NC surface through its multiple functional groups in place of oleate and alkylammonium ligands. The PMAO-induced transformation of Cs<sub>4</sub>PbBr<sub>6</sub> NCs opens up a strategy for the chemical modification of metal halide NCs initially passivated with nucleophilic amines.

scholarly journals Structure and Surface Passivation of Ultrathin Cesium Lead-Halide Nanoplatelets Revealed by Multilayer Diffraction

2021 ◽  
Author(s):  
Stefano Toso ◽  
Dmitry Baranov ◽  
Cinzia Giannini ◽  
Liberato Manna
Keyword(s):  
Optical Properties ◽  
Surface Passivation ◽  
Organic Ligands ◽  
X Ray Diffraction ◽  
Bulk Materials ◽  
X Ray ◽  
Natural Tendency ◽  
Halide Perovskite ◽  
Compositional Characterization ◽  
Lead Halide

The research on bidimensional colloidal semiconductors has received a boost from the emergence of ultrathin lead-halide perovskite nanoplatelets. While the optical properties of these materials have been widely investigated, their accurate structural and compositional characterization is still challenging. Here, we exploited the natural tendency of the platelets to stack into highly ordered films, which can be treated as single crystals made of alternating layers of organic ligands and inorganic nanoplatelets, to investigate their structure by Multilayer Diffraction. Using X-ray diffraction alone, this method allowed to refine the structure of ∼12 Å thick Cs-Pb-Br perovskite and ∼25 Å thick Cs-Pb-Cl-I Ruddlesden-Popper nanoplatelets by precisely measuring their thickness, stoichiometry, surface passivation type and coverage, as well as deviations from the crystal structures of the corresponding bulk materials. It is noteworthy that a single, readily available experimental technique, coupled with proper modeling, provides access to such detailed structural and composition information.

Rapid sampling during synthesis of lead halide perovskite nanocrystals for spectroscopic measurement

MRS Advances ◽  
2019 ◽  
Vol 4 (36) ◽  
pp. 1957-1964 ◽  
Author(s):  
James C. Sadighian ◽  
Michael L. Crawford ◽  
Cathy Y. Wong
Keyword(s):  
Surface Passivation ◽  
Photophysical Properties ◽  
Spectroscopic Measurement ◽  
Ex Situ ◽  
Spectroscopic Measurements ◽  
Perovskite Nanocrystals ◽  
Rapid Sampling ◽  
Fluorescence Measurements ◽  
Halide Perovskite ◽  
Lead Halide

ABSTRACTThe photophysical properties of lead halide perovskite nanocrystals (NCs) are critical to their potential application in light emitting devices and other optoelectronics, and are typically characterized using optical spectroscopies. Measurements of nuclei and nascent NC photophysics during synthesis provide insight into how the reaction can be changed to control the properties of the resulting NCs. However, these measurements are typically only performed ex situ after growth is halted by centrifuging the reaction mixture for several minutes. Here, a method is reported to rapidly sample the reaction mixture during a solvation-limited synthesis to enable multiple spectroscopic measurements during nucleation and NC growth. Absorbance and fluorescence measurements of a reaction mixture during the formation of methylammonium lead triiodide perovskite NCs are reported. The changing positions of spectral features as a function of reaction time show the expected weakening of exciton confinement during NC growth. The evolving fluorescence spectra demonstrate that the capping and surface passivation of nascent NCs changes during the reaction. The species in the reaction mixture, particularly during the early stages of the synthesis, are shown to be unstable. This indicates that, even for a relatively slow solvation-limited reaction, the photophysics of the reaction mixture can only be accurately captured if spectroscopic measurements are completed within seconds of sampling. The common use of centrifugation to quench NC syntheses prior to spectroscopic measurement biases the NC population towards more stable, well-capped NCs and does not accurately report on the full NC population in a reaction mixture.

Lead Halide Perovskite Nanocrystals: Stability, Surface Passivation, and Structural Control

ChemNanoMat ◽  
2017 ◽  
Vol 3 (7) ◽  
pp. 456-465 ◽  
Author(s):  
Binbin Luo ◽  
Sara Bonabi Naghadeh ◽  
Jin Z. Zhang
Keyword(s):  
Structural Control ◽  
Surface Passivation ◽  
Perovskite Nanocrystals ◽  
Halide Perovskite ◽  
Lead Halide

scholarly journals Transforming Colloidal Cs4PbBr6 Nanocrystals by Poly(maleic anhydride-alt-1-octadecene) into Stable CsPbBr3 Perovskite Emitters Through Intermediate Heterostructures

2020 ◽  
Author(s):  
Dmitry Baranov ◽  
Gianvito Caputo ◽  
Luca Goldoni ◽  
Zhiya Dang ◽  
Riccardo Scarfiello ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Cryogenic Temperature ◽  
Colloidal Stability ◽  
Surface Passivation ◽  
High Resolution Electron Microscopy ◽  
Dual Emission ◽  
Perovskite Nanocrystals ◽  
Resolution Electron ◽  
Halide Perovskite ◽  
Lead Halide

The preparation of strongly emissive CsPbBr<sub>3</sub> perovskite nanocrystals with a robust surface passivation is a challenge in the field of lead halide perovskite nanomaterials. We report an approach to prepare polymer-capped CsPbBr<sub>3</sub> perovskite nanocrystals by reacting oleylammonium/oleate-capped Cs<sub>4</sub>PbBr<sub>6</sub> nanocrystals with poly(maleic anhydride-alt-1-octadecene) (PMAO). PMAO contains succinic anhydride units that are reactive towards the oleylamine species present on Cs<sub>4</sub>PbBr<sub>6 </sub>nanocrystals’ surface and produces polysuccinamic acid, which, in turn, triggers the Cs<sub>4</sub>PbBr<sub>6</sub> to CsPbBr<sub>3 </sub>conversion. The transformation occurs through the formation of Cs<sub>4</sub>PbBr<sub>6</sub>-CsPbBr<sub>3</sub> heterostructures as intermediates, which were captured because of the mild reactivity of PMAO and were investigated by high-resolution electron microscopy. The Cs<sub>4</sub>PbBr<sub>6</sub>-CsPbBr<sub>3</sub> heterostructures demonstrate a dual emission at cryogenic temperature with an indication of the energy transfer from Cs<sub>4</sub>PbBr<sub>6</sub> to CsPbBr<sub>3</sub>. The fully-transformed CsPbBr<sub>3</sub> NCs have high photoluminescence quantum yield and enhanced colloidal stability, which we attribute to the adhesion of polysuccinamic acid to the NC surface through its multiple functional groups in place of oleate and alkylammonium ligands. The PMAO-induced transformation of Cs<sub>4</sub>PbBr<sub>6</sub> NCs opens up a strategy for the chemical modification of metal halide NCs initially passivated with nucleophilic amines.

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