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The Origin of Slow Carrier Transport in BiVO4 Thin Film Photoanodes: A Time-Resolved Microwave Conductivity Study
Open accessAbstract
We unravel for the first time the origin of the poor carrier transport properties of BiVO 4, a promising metal oxide photoanode for solar water splitting. Time-resolved microwave conductivity (TRMC) measurements reveal an (extrapolated) carrier mobility of ∼4 × 10 –2 cm 2 V –1 s –1 for undoped BiVO 4 under ∼1 sun illumination conditions, which is unusually low for a photoanode material. The poor carrier mobility is compensated by an unexpectedly long carrier lifetime of 40 ns. This translates to a relatively long diffusion length of 70 nm, consistent with the high quantum efficiencies reported for BiVO 4 photoanodes. Tungsten (W) doping is found to strongly decrease the carrier mobility by introducing intermediate-depth donor defects as carrier traps. At the same time, the increased carrier density improves the overall photoresponse, which confirms that bulk electronic conductivity is one of the main performance bottlenecks for BiVO 4 .
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Cited by
Visible-light driven heterojunction photocatalysts for water splitting – a critical review
Moniz, S. J. A., Shevlin, S. A., Martin, D. J., Guo, Z.-X., & Tang, J. (2015) · Energy & Environmental Science · doi:10.1039/c4ee03271c · Cited by 2,363
Semiconducting materials for photoelectrochemical energy conversion
Sivula, K., & van de Krol, R. (2016) · Nature Reviews Materials · doi:10.1038/natrevmats.2015.10 · Cited by 1,645
Self-citationElaborately Modified BiVO4 Photoanodes for Solar Water Splitting
Kim, J. H., & Lee, J. S. (2019) · Advanced Materials · doi:10.1002/adma.201806938 · Cited by 538
Tan, H. L., Amal, R., & Ng, Y. H. (2017) · Journal of Materials Chemistry A · doi:10.1039/c7ta04441k · Cited by 459
A Front‐Illuminated Nanostructured Transparent BiVO4 Photoanode for >2% Efficient Water Splitting
Kuang, Y., Jia, Q., Nishiyama, H., Yamada, T., Kudo, A., & Domen, K. (2016) · Advanced Energy Materials · doi:10.1002/aenm.201501645 · Cited by 359
Metadata
- Authors
- Abdi, F. F., Savenije, T. J., May, M. M., Dam, B., & van de Krol, R.
- Venue
- The Journal of Physical Chemistry Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2013-08-05
- Volume
- 4
- Issue
- 16
- Pages
- 2752-2757
- ISSN
- 1948-7185 (ISSN-L)
- OpenAlex
- W2315018026
- Cited by
- 590
- References
- 0
- FWCI
- 11.18
- Type
- journal article
- Language
- en
- Open access
- green
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- Abdi, F. F., Savenije, T. J., May, M. M., Dam, B., & van de Krol, R. (2013). The Origin of Slow Carrier Transport in BiVO4 Thin Film Photoanodes: A Time-Resolved Microwave Conductivity Study. The Journal of Physical Chemistry Letters. https://doi.org/10.1021/jz4013257
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