Imperial College London
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Dr Robert Hoye, FIMMM CEng CSci

Faculty of Engineering, Department of Materials

Honorary Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 6048r.hoye Website

 
 
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Location

 

2.27Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Otero-Martinez:2022:10.1002/anie.202205617,
author = {Otero-Martinez, C and Imran, M and Schrenker, N and Ye, J and Ji, K and Rao, A and Stranks, S and Hoye, R and Bals, S and Manna, L and Pérez-Juste, J and Polavarapu, L},
doi = {10.1002/anie.202205617},
journal = {Angewandte Chemie International Edition},
title = {Fast A-site cation cross-exchange at room temperature: single-to double-and triple-cation halide perovskite nanocrystals},
url = {http://dx.doi.org/10.1002/anie.202205617},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We report here fast A-site cation cross-exchange betweenAPbX3 perovskite nanocrystals (NCs) made of different A-cations (Cs(Cesium), FA (formamidinium), and MA (methylammonium)) at roomtemperature. Surprisingly, the A-cation cross-exchange proceeds asfast as the halide (X=Cl, Br, or I) exchange with the help of free Aoleate complexes present in the freshly prepared colloidal perovskiteNC solutions. It enabled the preparation of double (MACs, MAFA,CsFA)- and triple (MACsFA)-cation perovskite NCs with an opticalbandgap that is finely tunable by their A-site composition. The opticalspectroscopy together with structural analysis using XRD andatomically resolved high angle annular dark-field scanningtransmission electron microscopy (HAADFSTEM) and integrateddifferential phase contrast (iDPC) STEM indicates the homogeneousdistribution of different cations in the mixed perovskite NC lattice.Unlike halide ions, the A-cations do not phase segregate under lightillumination.
AU  - Otero-Martinez,C
AU  - Imran,M
AU  - Schrenker,N
AU  - Ye,J
AU  - Ji,K
AU  - Rao,A
AU  - Stranks,S
AU  - Hoye,R
AU  - Bals,S
AU  - Manna,L
AU  - Pérez-Juste,J
AU  - Polavarapu,L
DO  - 10.1002/anie.202205617
PY  - 2022///
SN  - 1433-7851
TI  - Fast A-site cation cross-exchange at room temperature: single-to double-and triple-cation halide perovskite nanocrystals
T2  - Angewandte Chemie International Edition
UR  - http://dx.doi.org/10.1002/anie.202205617
ER  -
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