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Title: Nanoscale imaging of charge carrier transport in water splitting photoanodes

Abstract

The performance of energy materials hinges on the presence of structural defects and heterogeneity over different length scales. Here we map the correlation between morphological and functional heterogeneity in bismuth vanadate, a promising metal oxide photoanode for photoelectrochemical water splitting, by photoconductive atomic force microscopy. We demonstrate that contrast in mapping electrical conductance depends on charge transport limitations, and on the contact at the sample/probe interface. Using temperature and illumination intensity-dependent current–voltage spectroscopy, we find that the transport mechanism in bismuth vanadate can be attributed to space charge-limited current in the presence of trap states. We observe no additional recombination sites at grain boundaries, which indicates high defect tolerance in bismuth vanadate. These findings support the fabrication of highly efficient bismuth vanadate nanostructures and provide insights into how local functionality affects the macroscopic performance.

Authors:
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Publication Date:
Research Org.:
Scuba Probe Technologies LLC, Alameda, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division; USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)
Contributing Org.:
Scuba Probe Technologies LLC, Alameda, CA (United States)
OSTI Identifier:
1457514
Alternate Identifier(s):
OSTI ID: 1460612; OSTI ID: 1465473
Grant/Contract Number:  
SC0013212; AC02-05CH11231; IIP-141659; SC 0013212
Resource Type:
Journal Article: Published Article
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; Electrocatalysis, Solar fuels; 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Eichhorn, Johanna, Kastl, Christoph, Cooper, Jason K., Ziegler, Dominik, Schwartzberg, Adam M., Sharp, Ian D., and Toma, Francesca M.. Nanoscale imaging of charge carrier transport in water splitting photoanodes. United States: N. p., 2018. Web. doi:10.1038/s41467-018-04856-8.
Eichhorn, Johanna, Kastl, Christoph, Cooper, Jason K., Ziegler, Dominik, Schwartzberg, Adam M., Sharp, Ian D., & Toma, Francesca M.. Nanoscale imaging of charge carrier transport in water splitting photoanodes. United States. doi:10.1038/s41467-018-04856-8.
Eichhorn, Johanna, Kastl, Christoph, Cooper, Jason K., Ziegler, Dominik, Schwartzberg, Adam M., Sharp, Ian D., and Toma, Francesca M.. Mon . "Nanoscale imaging of charge carrier transport in water splitting photoanodes". United States. doi:10.1038/s41467-018-04856-8.
@article{osti_1457514,
title = {Nanoscale imaging of charge carrier transport in water splitting photoanodes},
author = {Eichhorn, Johanna and Kastl, Christoph and Cooper, Jason K. and Ziegler, Dominik and Schwartzberg, Adam M. and Sharp, Ian D. and Toma, Francesca M.},
abstractNote = {The performance of energy materials hinges on the presence of structural defects and heterogeneity over different length scales. Here we map the correlation between morphological and functional heterogeneity in bismuth vanadate, a promising metal oxide photoanode for photoelectrochemical water splitting, by photoconductive atomic force microscopy. We demonstrate that contrast in mapping electrical conductance depends on charge transport limitations, and on the contact at the sample/probe interface. Using temperature and illumination intensity-dependent current–voltage spectroscopy, we find that the transport mechanism in bismuth vanadate can be attributed to space charge-limited current in the presence of trap states. We observe no additional recombination sites at grain boundaries, which indicates high defect tolerance in bismuth vanadate. These findings support the fabrication of highly efficient bismuth vanadate nanostructures and provide insights into how local functionality affects the macroscopic performance.},
doi = {10.1038/s41467-018-04856-8},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {Mon Jul 16 00:00:00 EDT 2018},
month = {Mon Jul 16 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1038/s41467-018-04856-8

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Works referenced in this record:

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