Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Extending the lifetime of photogenerated charges, to do useful work such as reduction and oxidation reactions involved in the solar water splitting process, has been a longstanding challenge. Long charge carrier lifetimes are desired to compensate for the slow kinetic nature of this process, however, photogenerated charges are susceptible to recombination unless they can be spatially separated.1–3 This can be achieved by coupling n-type semiconductors with appropriate conduction and valence band positions, providing a thermodynamic driving force for charge separation. BiVO4 and WO3 are attractive candidates for these systems due to their complementary properties of light harvesting, appreciable band gap, and high quantum efficiencies of light conversion to oxidise water with moderate applied bias, at ultra-bandgap wavelengths. 4,5 Although the heterojunction demonstrates enhanced performance, the exact nature of the charge transfer across the materials remains elusive.6,7 The effect of charge separation on charge lifetimes, and the bias dependence of this process has been probed using transient absorption spectroscopy and transient photocurrent measurements, revealing sub-μs electron transfer to WO3. Charge separation is shown to significantly extend hole carrier lifetimes in the μs-s timescale, thus explaining the photocurrent enhancement in the heterojunction configuration.
References
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