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SUMMARY:Ultrafast optical spectroscopy: from new tools to insights into pr
 intable photovoltaic materials - Justin Hodgkiss\, RSC Easterfield Prize W
 inner 2016
DTSTART:20170117T160000Z
DTEND:20170117T170000Z
UID:TALK68993@talks.cam.ac.uk
CONTACT:Alice Wood
DESCRIPTION:Next generation photovoltaic materials\, including polymers an
 d organometal halide perovskites\, offer tremendous potential for low cost
  clean energy. However\, the design of more effective materials is hindere
 d by lack of understanding of the mechanisms by which these complex and di
 sordered materials convert light to electricity. We have developed a serie
 s of time-resolved optical spectroscopy experiments that resolve different
  properties of photoexcitations in these materials.\n\nIn this talk\, I wi
 ll review some of our recent insights from ultrafast spectroscopy. In orga
 nic semiconductors\, these highlights include evidence for ultrafast long-
 range charge separation\,1 as well as the roles of delocalised excitons an
 d disordered phases\, ultrafast light harvesting\, and singlet exciton fis
 sion. The organic materials will be contrasted with efficient organometal 
 halide perovskites\, where we find efficient free charge photogeneration.\
 n
LOCATION:Pfizer LT
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