Speaker
Mr
Kevin Jablonka
(EPFL)
Description
Charge-carrier cooling in transition metal oxides is of outmost importance in photovoltaics where it affects the cell performances. In this study, charge-carrier cooling is investigated by femtosecond broadband UV spectroscopy with different pump wavelengths where the cooling can be monitored via a red-shifting optical bleach towards the optical gap energy. Lifetime density analysis provides the cooling time with respect to the pump excess energy. In agreement with previous theoretical works by V.P. Zhukov and coworkers, we find that the cooling time is limited by the electron cooling.
Authors
Mr
Kevin Jablonka
(EPFL)
Thomas Rossi
(EPFL)
Dr
Malte Oppermann
(EPFL-SB-ISIC-LSU)
Prof.
Majed Chergui
(EPFL-SB-ISIC-LSU)
