Imperial College London
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Professor David W. McComb

Faculty of Engineering, Department of Materials

Adjunct Professor
 
 
 
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Contact

 

+44 (0)20 7594 6750d.mccomb Website

 
 
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Location

 

Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Brennan:2023:10.1021/acsenergylett.3c00427,
author = {Brennan, MC and Veghte, DP and Ford, BR and McCleese, CL and Loftus, LM and McComb, DW and Song, Z and Heben, MJ and Grusenmeyer, TA},
doi = {10.1021/acsenergylett.3c00427},
journal = {ACS Energy Letters},
pages = {2150--2158},
title = {Photolysis of Mixed Halide Perovskite Nanocrystals},
url = {http://dx.doi.org/10.1021/acsenergylett.3c00427},
volume = {8},
year = {2023}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Colloidal mixed halide perovskite nanocrystals (NCs) irreversibly degrade when exposed to ultraviolet-visible irradiation. Here, mixed halide perovskite NC photolysis is tracked via mass spectrometry, electron microscopy, and photoluminescence. The data shows continuous wave ultraviolet-visible irradiation causes the heavier halides within the alloy to sublimate. This ultimately transforms CsPb(I1-xBrx)3 and CsPb(Cl1-xBrx)3 (x ≈ 0.50) NCs into CsPbBr3 and CsPbCl3 NCs, respectively. Time-resolved mass spectrometry demonstrates real-time desorption of volatile halide species (e.g., I2(g)/HI(g)) during irradiation. Energy-dispersive X-ray spectroscopy confirms near complete expulsion of I- from CsPb(I1-xBrx)3 and Br- from CsPb(Cl1-xBrx)3 NCs. Electron diffraction and cathodoluminescence establish lattice contractions and emission blueshifts consistent with formation of single halide perovskites from parent mixed halide alloys. Finally, increasing photolysis rates at higher temperatures follow an Arrhenius relationship with an effective activation energy of ∼62 kJ mol-1 for CsPb(I1-xBrx)3 NCs (x ≈ 0.50). Altogether, this work provides important insight into the photolysis of colloidal perovskite NC alloys.
AU  - Brennan,MC
AU  - Veghte,DP
AU  - Ford,BR
AU  - McCleese,CL
AU  - Loftus,LM
AU  - McComb,DW
AU  - Song,Z
AU  - Heben,MJ
AU  - Grusenmeyer,TA
DO  - 10.1021/acsenergylett.3c00427
EP  - 2158
PY  - 2023///
SP  - 2150
TI  - Photolysis of Mixed Halide Perovskite Nanocrystals
T2  - ACS Energy Letters
UR  - http://dx.doi.org/10.1021/acsenergylett.3c00427
VL  - 8
ER  -
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