Obiettivo Transition metal (TM) oxides (TiO2, ZnO, NiO) are large gap insulators that have emerged as highly attractive materials over the past two decades for applications in photocatalysis, solar energy conversion, etc., all of which rely on the generation of charge carriers, their evolution and their eventual trapping at defects or a self-trapped excitons. Despite the huge interest for such materials, the very nature of the elementary electronic excitations (Frenkel, Wannier or charge transfer exciton) is still not established, nor is the way these excitations evolve after being created: excitonic polaron or charged polaron. Finally, the electron and hole recombine is also not clearly established because of issue of defects and trapping. In order to tackle these issues, here we implement novel experimental tools that would provide us with hitherto inaccessible information about the charge carrier dynamics in TM oxides. Of importance is the ability to detect both the electrons and the holes. Some of these tools have been developed in the PI’s group: i) Ultrafast X-ray absorption spectroscopy (XAS) will provide information about the final metal d-orbitals and about the structural changes around it; ii) Ultrafast X-ray emission (XES) will provide information about hole states. While these two approaches are ideal element-selective ones, the localization of the electron at metal atoms represents a small proportion of the electron population. Therefore, ultrafast Angle-resolved photoemission spectroscopy (ARPES) will be used to map out the band structure changes in the system and the evolution of the conduction band electrons. Ultrafast 2-dimensional (2D) UV (<400nm) transient absorption spectroscopy allows the mapping of the time evolution of both the valence and the conduction bands by its ability to pump and probe above the band gap. Last, Fourier Transform visible 2D spectroscopy will allow the probing of gap state dynamics at high time resolution. Campo scientifico natural scienceschemical sciencescatalysisphotocatalysisnatural scienceschemical sciencesinorganic chemistryinorganic compoundsnatural scienceschemical sciencesinorganic chemistrytransition metalsnatural sciencesphysical sciencesatomic physicsnatural sciencesphysical sciencesopticsspectroscopyabsorption spectroscopy Parole chiave electrons holes band structure charge trapping surfaces Titanium dioxide Zinc Oxide Nickel Oxide nanoparticles single crystals Programma(i) H2020-EU.1.1. - EXCELLENT SCIENCE - European Research Council (ERC) Main Programme Argomento(i) ERC-ADG-2015 - ERC Advanced Grant Invito a presentare proposte ERC-2015-AdG Vedi altri progetti per questo bando Meccanismo di finanziamento ERC-ADG - Advanced Grant Istituzione ospitante ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE Contribution nette de l'UE € 2 482 305,00 Indirizzo BATIMENT CE 3316 STATION 1 1015 Lausanne Svizzera Mostra sulla mappa Regione Schweiz/Suisse/Svizzera Région lémanique Vaud Tipo di attività Higher or Secondary Education Establishments Collegamenti Contatta l’organizzazione Opens in new window Sito web Opens in new window Partecipazione a programmi di R&I dell'UE Opens in new window Rete di collaborazione HORIZON Opens in new window Costo totale € 2 482 305,00 Beneficiari (1) Classifica in ordine alfabetico Classifica per Contributo netto dell'UE Espandi tutto Riduci tutto ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE Svizzera Contribution nette de l'UE € 2 482 305,00 Indirizzo BATIMENT CE 3316 STATION 1 1015 Lausanne Mostra sulla mappa Regione Schweiz/Suisse/Svizzera Région lémanique Vaud Tipo di attività Higher or Secondary Education Establishments Collegamenti Contatta l’organizzazione Opens in new window Sito web Opens in new window Partecipazione a programmi di R&I dell'UE Opens in new window Rete di collaborazione HORIZON Opens in new window Costo totale € 2 482 305,00