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Wednesday, February 25, 2015
4:00 PM - 5:00 PM
CNLS Conference Room (TA-3, Bldg 1690)

Seminar

Excited state dynamics at complex interfaces: time-domain ab initio studies

Oleg Prezhdo
University of Southern California, Los Angeles

Photo-induced processes at various interfaces form foundation of photovoltaic and photo-catalytic applications. They require understanding of dynamical response of novel materials on atomic and nanometer scales. Our non-adiabatic molecular dynamics techniques, implemented within time-dependent density functional theory, allow us to model such non-equilibrium response in real time. The talk will focus on photo-initiated charge and energy transfer at interfaces involving organic and inorganic nanoscale materials. Examples include TiO2 sensitized with organic molecules, water, semiconductor quantum dots and graphene, GaN/water interface, carbon nanotube bundles, mixtures of C60 with inorganic particles, etc. Photoinduced charge separation across such interfaces creates many challenges due to stark differences between molecular and periodic, and organic and inorganic systems. Our simulations provide a unifying description of quantum dynamics on nanoscale, characterize the rates and branching ratios of competing processes, resolve debated issues, and generate theoretical guidelines for development of novel systems for solar energy harvesting.

Host: Tammie Nelson, T-1