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Надточенко, В. А.; Денисов, Н. Н.; Gak, V. Yu.; Гостев, Ф. Е.; Titov, A. A.; Sarkisov, O. M.; Nikandrov, V. V.

doi:10.1023/a:1015504217815

Cited by 23 publications

(34 citation statements)

References 22 publications

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“…Such studies have reported only a very small percentage of charge carriers remaining a few hundreds of nanoseconds aer laser excitation. 12,52,54,55,65,66 As such, ultrafast recombination is usually reported as the main fate of the photogenerated charge carriers in hematite, as the short-lived charge carriers are unlikely to have sufficient time to drive the challenging chemistry of water oxidation. It should however be noted that those ultrafast studies are typically carried out with rather high excitation densities, resulting in high photoinduced charge carrier densities, and therefore fast bimolecular (non-geminate) recombination.…”

Section: Transient Absorption Spectroscopy Of Hematitementioning

confidence: 99%

Charge carrier trapping, recombination and transfer in hematite (α-Fe2O3) water splitting photoanodes

et al. 2013

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Hematite is currently considered one of the most promising materials for the conversion and storage of solar energy via the photoelectrolysis of water. Whilst there has been extensive research and much progress in the development of hematite structures with enhanced photoelectrochemical (PEC) activity, relatively limited information has been available until recently concerning the dynamics of photogenerated charge carriers in hematite and their impact upon the efficiency of water photoelectrolysis. In this perspective we present an overview of our recent studies of the dynamics of photoinduced charge carrier processes in hematite, derived primarily from transient absorption spectroscopy of nanostructured photoanodes. The relationship between PEC activity and transient measurements are discussed in terms of a phenomenological model which rationalizes the observations and in particular the impact of external potential bias on the relative rates of charge carrier trapping, recombination and interfacial transfer in hematite photoanodes for water oxidation.

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Section: Transient Absorption Spectroscopy Of Hematitementioning

confidence: 99%

Charge carrier trapping, recombination and transfer in hematite (α-Fe2O3) water splitting photoanodes

et al. 2013

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“…Control experiments were carried out for non-resonant signals of the coherent spike from the net PE lm. 27…”

Section: Femto-second Laser Spectroscopymentioning

confidence: 99%

Innovative photocatalyst (FeO_x–TiO₂): transients induced by femtosecond laser pulse leading to bacterial inactivation under visible light

et al. 2015

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“…12 Using this assignment, transient absorption (TA) spectroscopic studies have reported shortlived (<100 picoseconds) photocarriers in these materials. [13][14][15][16][17][18][19][20] In contrast to these earlier findings, more recent studies have identified a long-lived (>microseconds) absorption band at 580 nm due to photogenerated holes 21,22 in nanoporous hematite films with reported high incident-photon-to-electron-conversion-efficiency (IPCE).…”

mentioning

confidence: 99%

In situ probe of photocarrier dynamics in water-splitting hematite (α-Fe2O3) electrodes

Huang

Lin

Xiang

et al. 2012

Energy Environ. Sci.

123

163

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The spectra and dynamics of photogenerated electrons and holes in excited hematite (a-Fe 2 O 3 ) electrodes are investigated by transient absorption (from visible to infrared and from femto-to microseconds), bias-dependent differential absorption and Stark spectroscopy. Comparison of results from these techniques enables the assignment of the spectral signatures of photogenerated electrons and holes. Under the pulse illumination conditions of transient absorption (TA) measurement, the absorbed photon to electron conversion efficiency (APCE) of the films at 1.43 V (vs. reversible hydrogen electrode, RHE) is 0.69%, significantly lower than that at AM 1.5. TA kinetics shows that under these conditions, >98% of the photogenerated electrons and holes have recombined by 6 ms. Although APCE increases with more positive bias (from 0.90 to 1.43 V vs. RHE), the kinetics of holes up to 6 ms show negligible change, suggesting that the catalytic activity of the films is determined by holes with longer lifetimes.

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Cited by 23 publications

References 22 publications

Charge carrier trapping, recombination and transfer in hematite (α-Fe2O3) water splitting photoanodes

Charge carrier trapping, recombination and transfer in hematite (α-Fe2O3) water splitting photoanodes

Innovative photocatalyst (FeO_x–TiO₂): transients induced by femtosecond laser pulse leading to bacterial inactivation under visible light

In situ probe of photocarrier dynamics in water-splitting hematite (α-Fe2O3) electrodes

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Untitled

Cited by 23 publications

References 22 publications

Charge carrier trapping, recombination and transfer in hematite (α-Fe2O3) water splitting photoanodes

Charge carrier trapping, recombination and transfer in hematite (α-Fe2O3) water splitting photoanodes

Innovative photocatalyst (FeOx–TiO2): transients induced by femtosecond laser pulse leading to bacterial inactivation under visible light

In situ probe of photocarrier dynamics in water-splitting hematite (α-Fe2O3) electrodes

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Innovative photocatalyst (FeO_x–TiO₂): transients induced by femtosecond laser pulse leading to bacterial inactivation under visible light