title: Charge carrier dynamics of photoexcited Co3O4 in methanol: extending high harmonic transient absorption spectroscopy to liquid environments.
abstract: Charge carrier dynamics in Co3O4 thin films are observed using high harmonic generation transient absorption spectroscopy at the Co M2,3 edge. Results reveal that photoexcited Co3O4 decays to the ground state in 600 ± 40 ps in liquid methanol compared to 1.9 ± 0.3 ns in vacuum. Kinetic analysis suggests that surface-mediated relaxation of photoexcited Co3O4 may be the result of hole transfer from Co3O4 followed by carrier recombination at the Co3O4-methanol interface.
authors.affiliation: Department of Chemistry, ‡Department of Mechanical Engineering, and §Department of Physics, University of California , Berkeley, Berkeley, California 94720, United States.
authors.forename: L Robert
authors.initials: LR
authors.lastname: Baker
authors.forename: Chang-Ming
authors.initials: CM
authors.lastname: Jiang
authors.forename: Stephen T
authors.initials: ST
authors.lastname: Kelly
authors.forename: J Matthew
authors.initials: JM
authors.lastname: Lucas
authors.forename: Josh
authors.initials: J
authors.lastname: Vura-Weis
authors.forename: Mary K
authors.initials: MK
authors.lastname: Gilles
authors.forename: A Paul
authors.initials: AP
authors.lastname: Alivisatos
authors.forename: Stephen R
authors.initials: SR
authors.lastname: Leone
keywords: High harmonic generation; interfacial charge transfer; ligand-to-metal charge transfer; photocatalysis; surface states; transient absorption spectroscopy