Imperial College London
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DrAndreasKafizas

Faculty of Natural Sciences, Department of Chemistry

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 6752a.kafizas Website

 
 
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Location

 

301GMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Meng:2023:10.1021/jacs.3c04287,
author = {Meng, Z and Pastor, E and Selim, S and Ning, H and Maimaris, M and Kafizas, A and Durrant, JR and Bakulin, AA},
doi = {10.1021/jacs.3c04287},
journal = {Journal of the American Chemical Society},
pages = {17700--17709},
title = {Operando IR optical control of localized charge carriers in BiVO4 photoanodes},
url = {http://dx.doi.org/10.1021/jacs.3c04287},
volume = {145},
year = {2023}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - In photoelectrochemical cells (PECs) the photon-to-current conversion efficiency is often governed by carrier transport. Most metal oxides used in PECs exhibit thermally activated transport due to charge localization via the formation of polarons or the interaction with defects. This impacts catalysis by restricting the charge accumulation and extraction. To overcome this transport bottleneck nanostructuring, selective doping and photothermal treatments have been employed. Here we demonstrate an alternative approach capable of directly activating localized carriers in bismuth vanadate (BiVO4). We show that IR photons can optically excite localized charges, modulate their kinetics, and enhance the PEC current. Moreover, we track carriers bound to oxygen vacancies and expose their ∼10 ns charge localization, followed by ∼60 μs transport-assisted trapping. Critically, we demonstrate that localization is strongly dependent on the electric field within the device. While optical modulation has still a limited impact on overall PEC performance, we argue it offers a path to control devices on demand and uncover defect-related photophysics.
AU  - Meng,Z
AU  - Pastor,E
AU  - Selim,S
AU  - Ning,H
AU  - Maimaris,M
AU  - Kafizas,A
AU  - Durrant,JR
AU  - Bakulin,AA
DO  - 10.1021/jacs.3c04287
EP  - 17709
PY  - 2023///
SN  - 0002-7863
SP  - 17700
TI  - Operando IR optical control of localized charge carriers in BiVO4 photoanodes
T2  - Journal of the American Chemical Society
UR  - http://dx.doi.org/10.1021/jacs.3c04287
UR  - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:001041092300001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
UR  - https://pubs.acs.org/doi/10.1021/jacs.3c04287
UR  - http://hdl.handle.net/10044/1/107838
VL  - 145
ER  -
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