Publications de Fabio Giacomo Santomauro

Revealing hole trapping in zinc oxide nanoparticles by time-resolved X-ray spectroscopy

Majed Chergui, Thomas James Penfold, Wojciech Gawelda, Jochen Rittmann, Fabio Giacomo Santomauro

Nature Research2018

Revealing hole trapping in zinc oxide nanoparticles by time-resolved X-ray spectroscopy

Majed Chergui, Wojciech Gawelda, Thomas James Penfold, Jochen Rittmann, Fabio Giacomo Santomauro

AMER CHEMICAL SOC2018

The fate of charge carriers in solar materials investigated by time resolved X-ray and optical spectroscopy

This thesis investigates the photoinduced charge carrier dynamics of TiO2 nanoparticles and CsPbX3 (X = Cl, Br) nanocrystals, by means of ultrafast x-ray absorption spectroscopy (XAS) and transient absorption spectroscopy (TAS). TiO2 is among the most prom ...

EPFL2017

Localized holes and delocalized electrons in photoexcited inorganic perovskites: Watching each atomic actor by picosecond X-ray absorption spectroscopy

Majed Chergui, Gloria Capano, Thomas Charles Henry Rossi, Andre Al Haddad, Dominik Kinschel, Lars-Hendrik Mewes, Jakob Grilj, Fabio Giacomo Santomauro, James Michael Budarz

We report on an element-selective study of the fate of charge carriers in photoexcited inorganic CsPbBr3 and CsPb(ClBr)(3) perovskite nanocrystals in toluene solutions using time-resolved X-ray absorption spectroscopy with 80 ps time resolution. Probing th ...

Amer Inst Physics2017

Time-resolved Element-selective Probing of Charge Carriers in Solar Materials

Majed Chergui, Thomas Charles Henry Rossi, Mercedes Hannelore Rittmann-Frank, Jochen Rittmann, Dominik Kinschel, Fabio Giacomo Santomauro, James Michael Budarz

We review our recent results on the implementation of picosecond (ps) X-ray absorption spectroscopy to probe the electronic and geometric structure of centres formed by photoexcitation of solar materials such as TiO2 polymorphs and inorganic Cs-based perov ...

2017

Hunting for the elusive shallow traps in TiO2 anatase

Fabio Giacomo Santomauro

Understanding electron mobility on TiO2 is crucial because of its applications in photocatalysis and solar cells. This work shows that shallow traps believed to be involved in electron migration in TiO2 conduction band are formed upon band gap excitation, ...

Royal Society of Chemistry2015

Femtosecond X-ray absorption study of electron localization in photoexcited anatase TiO2

Majed Chergui, Paul Beaud, Edoardo Baldini, Jochen Rittmann, Camelia Borca, Fabio Giacomo Santomauro, Mahsa Silatani, Patric Zimmermann

Transition metal oxides are among the most promising solar materials, whose properties rely on the generation, transport and trapping of charge carriers (electrons and holes). Identifying the latter's dynamics at room temperature requires tools that combin ...

Nature Publishing Group2015

Transient mid-IR study of electron dynamics in TiO2 conduction band

Majed Chergui, Michel Rossi, Mercedes Hannelore Rittmann-Frank, Fabio Giacomo Santomauro

The dynamics of TiO2 conduction band electrons were followed with a novel broadband synchrotron-based transient mid-IR spectroscopy setup. The lifetime of conduction band electrons was found to be dependent on the injection method used. Direct band gap exc ...

Royal Society of Chemistry2013

Direct observation of charge separation on Au localized surface plasmons

Giulia Tagliabue, Mercedes Hannelore Rittmann-Frank, Fabio Giacomo Santomauro

Plasmonic nano-structures of d(10) metals are suggested to be the future of photo-voltaics and photo-catalysis under solar irradiation, thanks to their large light absorption cross-section, versatility, and stability. We investigated the impact of continuo ...

2013