Publication date: 31st March 2013
Ultrafast processes in BiVO4, a promising solar fuel material
Janneke Ravensbergen, Fatwa F. Abdi, Raoul N. Frese, Bernard Dam, Roel van de Krol and John T. M. Kennis
BiVO4is considered to be a promising photoanode material for solar water splitting applications. It absorbs visible light up to 520 nm and has good stability in aqueous solutions under prolonged illumination. In order to characterize the dynamic processes of photogenerated charges and identify functional bottlenecks of the material, we study BiVO4with ultrafast transient absorption spectroscopy. With a dual-laser setup we investigate the full time range from femtoseconds to milliseconds. Our time-resolved spectra show a continuum of excited-state absorption in the visible and near-IR. Also, at 475 nm, we see an excited state absorption band that rises with a 7 ps time-constant. Around 400 nm a negative band is observed, assigned to ground state bleach. The signals decay on multiple timescales, varying between picoseconds and microseconds. These are interpreted as charge recombination processes.
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