In this webinar, our speakers discuss solar energy conversion and demonstrate that the charge transport in BiVO4 photoanodes can be described by the space-charge-limited current model in the presence of trap states.
In this webinar, Dr. Francesca Toma gives a short overview of the ongoing research projects on solar energy conversion in her group. Dr. Johanna Eichhorn then focuses on the nanoscale characterization of BiVO4 - a highly interesting semiconductor light absorber for solar water splitting.
They both recently performed quantitative analysis of sub-pA photocurrent maps and I-V curves obtained with their Dimension Icon AFM. Specifically, they revealed the critical impact of:
For the first time, they have shown that the charge transport in BiVO4 photoanodes can be described by the space-charge-limited current model in the presence of trap states. Furthermore, they used complementary pc-AFM and in-situ Kelvin probe measurements to elucidate the influence of chemical interactions of adsorbed oxygen and water on charge transport and interfacial charge transfer of photogenerated charge carriers. Their research revealed that surface-adsorbed oxygen acts as a shallow trap state limiting electronic performance of BiVO4 thin films.
In their discussion, our speakers cover:
This webinar was presented on December 6, 2018.
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Dr. Francesca Toma
Staff Scientist, Chemical Sciences Division at Lawrence Berkeley National Laboratory
Dr. Johanna Eichhorn
Postdoctoral Fellow in the Chemical Sciences Division at Lawrence Berkeley National Laboratory