Photoinduced Processes in Metal Oxide Nanomaterials

Tkachenko, Nikolai V.; Khan, Ramsha

doi:10.1002/9783527826940.ch6

Cited by 2 publications

(2 citation statements)

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“…Transient absorption spectroscopy (TAS) is an indispensable, widely used, and well-developed technique to study fast and ultrafast photoinduced phenomena in a wide range of materials. It is a tool providing superior time resolution down to femtoseconds to deliver key information on the dynamics of photochemistry reactions , and primary events in natural photosynthesis, and recently it is one of the advanced techniques to study and optimize materials developed for solar cell and photocatalysis applications. − …”

Section: Introductionmentioning

confidence: 99%

Transient Absorption Spectroscopy of Films: Impact of Refractive Index

Pasanen,

Khan,

Odutola

et al. 2024

J. Phys. Chem. C

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Transient absorption spectroscopy is a powerful technique to study the photoinduced phenomena in a wide range of states from solutions to solid film samples. It was designed and developed based on photoinduced absorption changes or that photoexcitation triggers a chain of reactions with intermediate states or reaction steps with presumably different absorption spectra. However, according to general electromagnetic theory, any change in the absorption properties of a medium is accompanied by a change in the refractive properties. Although this photoinduced change in refractive index has a negligible effect on solution measurements, it may significantly affect the measured response of thin films. In this Perspective paper, we examine why and how the measured responses of films differ from their expected "pure" absorption responses. The effect of photoinduced refractive index change can be concluded and studied by comparing the transmitted and reflected probe light responses. Another discussed aspect is the effect of light interference on thin films. Finally, new opportunities of monitoring the photocarrier migration in films and studying nontransparent samples using the reflected probe light response are discussed. Most of the examples provided in this article focus on studies involving perovskite, TiO 2 , and graphene-based films, but the general discussion and conclusions can be applicable to a wide range of semiconductor and thin metallic films.

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Section: Introductionmentioning

confidence: 99%

Transient Absorption Spectroscopy of Films: Impact of Refractive Index

Pasanen,

Khan,

Odutola

et al. 2024

J. Phys. Chem. C

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“…Consequently, information about the quenching and transfer of charge carriers, along with their corresponding lifetimes, which is relevant to photonic applications, can be extracted within femtosecond to nanosecond timescales. [37][38][39] Herein, we have employed TR spectroscopy to get a complete picture of the phenomena related to ultrafast changes in reflectivity, diffusion of carriers, and particularly the CT process occurring at the interface in our TiO 2 /Si heterojunctions.…”

Section: Introductionmentioning

confidence: 99%

Contactless analysis of surface passivation and charge transfer at the TiO₂–Si interface

Khan,

Liu,

Vähänissi

et al. 2024

Phys. Chem. Chem. Phys.

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Photoinduced Processes in Metal Oxide Nanomaterials

Cited by 2 publications

References 96 publications

Transient Absorption Spectroscopy of Films: Impact of Refractive Index

Transient Absorption Spectroscopy of Films: Impact of Refractive Index

Contactless analysis of surface passivation and charge transfer at the TiO₂–Si interface

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Photoinduced Processes in Metal Oxide Nanomaterials

Cited by 2 publications

References 96 publications

Transient Absorption Spectroscopy of Films: Impact of Refractive Index

Transient Absorption Spectroscopy of Films: Impact of Refractive Index

Contactless analysis of surface passivation and charge transfer at the TiO2–Si interface

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Contactless analysis of surface passivation and charge transfer at the TiO₂–Si interface