Imperial College London
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Dr Jarvist Moore Frost

Faculty of Natural Sciences, Department of Chemistry

Royal Society URF (Lecturer)
 
 
 
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Contact

 

jarvist.frost Website

 
 
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Location

 

601FMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Carwithen:2023:10.1021/acsnano.2c12373,
author = {Carwithen, BP and Hopper, TR and Ge, Z and Mondal, N and Wang, T and Mazlumian, R and Zheng, X and Krieg, F and Montanarella, F and Nedelcu, G and Kroll, M and Siguan, MA and Frost, JM and Leo, K and Vaynzof, Y and Bodnarchuk, MI and Kovalenko, MV and Bakulin, AA},
doi = {10.1021/acsnano.2c12373},
journal = {ACS Nano},
pages = {6638--6648},
title = {Confinement and exciton binding energy effects on hot carrier cooling in lead halide perovskite nanomaterials},
url = {http://dx.doi.org/10.1021/acsnano.2c12373},
volume = {17},
year = {2023}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The relaxation of the above-gap (“hot”) carriers in lead halide perovskites (LHPs) is important for applications in photovoltaics and offers insights into carrier–carrier and carrier–phonon interactions. However, the role of quantum confinement in the hot carrier dynamics of nanosystems is still disputed. Here, we devise a single approach, ultrafast pump–push–probe spectroscopy, to study carrier cooling in six different size-controlled LHP nanomaterials. In cuboidal nanocrystals, we observe only a weak size effect on the cooling dynamics. In contrast, two-dimensional systems show suppression of the hot phonon bottleneck effect common in bulk perovskites. The proposed kinetic model describes the intrinsic and density-dependent cooling times accurately in all studied perovskite systems using only carrier–carrier, carrier–phonon, and excitonic coupling constants. This highlights the impact of exciton formation on carrier cooling and promotes dimensional confinement as a tool for engineering carrier–phonon and carrier–carrier interactions in LHP optoelectronic materials.
AU  - Carwithen,BP
AU  - Hopper,TR
AU  - Ge,Z
AU  - Mondal,N
AU  - Wang,T
AU  - Mazlumian,R
AU  - Zheng,X
AU  - Krieg,F
AU  - Montanarella,F
AU  - Nedelcu,G
AU  - Kroll,M
AU  - Siguan,MA
AU  - Frost,JM
AU  - Leo,K
AU  - Vaynzof,Y
AU  - Bodnarchuk,MI
AU  - Kovalenko,MV
AU  - Bakulin,AA
DO  - 10.1021/acsnano.2c12373
EP  - 6648
PY  - 2023///
SN  - 1936-0851
SP  - 6638
TI  - Confinement and exciton binding energy effects on hot carrier cooling in lead halide perovskite nanomaterials
T2  - ACS Nano
UR  - http://dx.doi.org/10.1021/acsnano.2c12373
UR  - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000962222000001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
UR  - https://pubs.acs.org/doi/10.1021/acsnano.2c12373
UR  - http://hdl.handle.net/10044/1/106492
VL  - 17
ER  -
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