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Title: Wavelength-Dependent Ultrafast Charge Carrier Separation in the WO 3 /BiVO 4 Coupled System

Abstract

Due to its ~2.4 eV band gap, BiVO4 is a very promising photoanode material for harvesting the blue portion of the solar light for photoelectrochemical (PEC) water splitting applications. In WO3/BiVO4 heterojunction films, the electrons photoexcited in BiVO4 are injected into WO3, overcoming the lower charge carriers’ diffusion properties limiting the PEC performance of BiVO4 photoanodes. Here, we investigate by ultrafast transient absorption spectroscopy the charge carrier interactions occurring at the interface between the two oxides in heterojunction systems to directly unveil their wavelength dependence. Under selective BiVO4 excitation, a favorable electron transfer from photoexcited BiVO4 to WO3 occurs immediately after excitation and leads to an increase of the trapped holes’ lifetime in BiVO4. However, a recombination channel opens when both oxides are simultaneously excited, evidenced by a shorter lifetime of trapped holes in BiVO4. As a result, PEC measurements reveal the implication of these wavelength-dependent ultrafast interactions on the performances of the WO3/BiVO4 heterojunction.

Authors:
; ; ; ; ; ; ORCiD logo; ORCiD logo
Publication Date:
Research Org.:
University of Notre Dame, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1356719
Alternate Identifier(s):
OSTI ID: 1372220
Grant/Contract Number:  
FC02-04ER15533
Resource Type:
Published Article
Journal Name:
ACS Energy Letters
Additional Journal Information:
Journal Name: ACS Energy Letters; Journal ID: ISSN 2380-8195
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE

Citation Formats

Grigioni, Ivan, Stamplecoskie, Kevin G., Jara, Danilo H., Dozzi, Maria Vittoria, Oriana, Aurelio, Cerullo, Giulio, Kamat, Prashant V., and Selli, Elena. Wavelength-Dependent Ultrafast Charge Carrier Separation in the WO 3 /BiVO 4 Coupled System. United States: N. p., 2017. Web. doi:10.1021/acsenergylett.7b00216.
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Grigioni, Ivan, Stamplecoskie, Kevin G., Jara, Danilo H., Dozzi, Maria Vittoria, Oriana, Aurelio, Cerullo, Giulio, Kamat, Prashant V., & Selli, Elena. Wavelength-Dependent Ultrafast Charge Carrier Separation in the WO 3 /BiVO 4 Coupled System. United States. https://doi.org/10.1021/acsenergylett.7b00216
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Grigioni, Ivan, Stamplecoskie, Kevin G., Jara, Danilo H., Dozzi, Maria Vittoria, Oriana, Aurelio, Cerullo, Giulio, Kamat, Prashant V., and Selli, Elena. Thu . "Wavelength-Dependent Ultrafast Charge Carrier Separation in the WO 3 /BiVO 4 Coupled System". United States. https://doi.org/10.1021/acsenergylett.7b00216.
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@article{osti_1356719,
title = {Wavelength-Dependent Ultrafast Charge Carrier Separation in the WO 3 /BiVO 4 Coupled System},
author = {Grigioni, Ivan and Stamplecoskie, Kevin G. and Jara, Danilo H. and Dozzi, Maria Vittoria and Oriana, Aurelio and Cerullo, Giulio and Kamat, Prashant V. and Selli, Elena},
abstractNote = {Due to its ~2.4 eV band gap, BiVO4 is a very promising photoanode material for harvesting the blue portion of the solar light for photoelectrochemical (PEC) water splitting applications. In WO3/BiVO4 heterojunction films, the electrons photoexcited in BiVO4 are injected into WO3, overcoming the lower charge carriers’ diffusion properties limiting the PEC performance of BiVO4 photoanodes. Here, we investigate by ultrafast transient absorption spectroscopy the charge carrier interactions occurring at the interface between the two oxides in heterojunction systems to directly unveil their wavelength dependence. Under selective BiVO4 excitation, a favorable electron transfer from photoexcited BiVO4 to WO3 occurs immediately after excitation and leads to an increase of the trapped holes’ lifetime in BiVO4. However, a recombination channel opens when both oxides are simultaneously excited, evidenced by a shorter lifetime of trapped holes in BiVO4. As a result, PEC measurements reveal the implication of these wavelength-dependent ultrafast interactions on the performances of the WO3/BiVO4 heterojunction.},
doi = {10.1021/acsenergylett.7b00216},
journal = {ACS Energy Letters},
number = ,
volume = ,
place = {United States},
year = {Thu May 11 00:00:00 EDT 2017},
month = {Thu May 11 00:00:00 EDT 2017}
}
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https://doi.org/10.1021/acsenergylett.7b00216
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