[Todos] Seminario DQIAQF - INQUIMAE, lunes 23 de mayo - 13 hs.

[andrea en qi.fcen.uba.ar]

Seminario DQIAQF - INQUIMAE,  lunes 23 de Mayo - 13 hs.

Aula de Seminarios INQUIMAE - DQIAQF
Facultad de Ciencias Exactas y Naturales
Ciudad Universitaria - Pab. 2  -  Piso 3

Gerald Meyer
Professor of Chemistry
Department of Chemistry Johns Hopkins University

“ELECTRON TRANSFER IN DYE-SENSITIZED SOLAR CELLS”

Abstract
Recently an order of magnitude increase in solar energy conversion
efficiencies from dye-sensitized photovoltaic cells has been realized.
These solar cells are based upon mesoporous thin films of nanocrystalline
(anatase) TiO2 sensitized to visible light with inorganic coordination
compounds that serve as dyes.  Under simulated sunlight conditions,
solar-to-electrical power conversion efficiencies of 11.47% have been
confirmed. The sensitized materials have an enormous surface area, a long
effective pathlength, and a high photoconductivity that affords both
spectroscopic and photoelectrochemical characterization of interfacial
charge transfer processes.

In this presentation an overview of our recent experimental studies of
solar energy conversion, materials processing, chemical bond formation,
and interfacial charge transfer will be presented.   Specific topics
include excited state, interfacial and intermolecular electron transfer at
sensitized semiconductor interfaces.  Recent data on electric field
effects at molecular-semiconductor interfaces as well as the mechanisms of
I-I bond formation will be presented.  These studies were designed to
provide insights into the factors that control electron transfer at
semiconductor interfaces with implications that extend beyond electrical
power generation to the growing research field of solar fuel production.



Biographical

Professor Gerald Meyer received his Ph.D. in chemistry at the University
of Wisconsin at Madison in 1989 under the direction of Professor Arthur B.
Ellis.  He then worked as a post-doctoral research associate at University
of North Carolina at Chapel Hill working with Professor Thomas J. Meyer
before joining the faculty at Johns Hopkins University in 1991 where he is
now the Bernard N. Baker Professor of Chemistry.   His research interests
include inorganic coordination chemistry, electron transfer, excited
states, photocatalysis, photoelectrochemistry, and solar energy
conversion.