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SUMMARY:Probing charge carriers in carbon materials with optical pulses - 
 Dr. Enrico Da Como\, Department of Physics\, University of Bath\, UK
DTSTART:20130618T090000Z
DTEND:20130618T100000Z
UID:TALK45593@talks.cam.ac.uk
CONTACT:Dr. Girish Lakhwani
DESCRIPTION:In optoelectronic devices charge carriers are converted into l
 ight by forming excitons\, for example in lasers and LEDs\, or light is ab
 sorbed and excitons are converted into charge carriers when considering ph
 otodiodes and solar cells. Optical spectroscopy is a formidable experiment
 al tool to understand light matter interaction and exciton dynamics\, but 
 less common for probing charge carriers. \n\nIn this seminar I will presen
 t recent experiments based on mid-infrared optical spectroscopy (1.3-0.3 e
 V photon-energy) aiming to detect and study charge carrier dynamics in gra
 phene materials and conjugated polymers. In the case of graphene\, infrare
 d optical pulses are used to understand carrier cooling after photoexcitat
 ion[1] and measure the hot carrier lifetime[2]. For conjugated polymers\, 
 the photoinduced generation of polaron-pairs in donor acceptor copolymers 
 is addressed considering the role of molecular structure[3] and excess pho
 ton energy[4].\n\nReferences\n\n[1]	T. Limmer\, A. J. Houtepen\, A. Niggeb
 aum\, R. Tautz\, E. Da Como\, Appl. Phys. Lett. 2011\, 99\, 103104.\n[2]	T
 . Limmer\, J. Feldmann\, E. Da Como\, Phys. Rev. Lett. 2013\, 110\, 217406
 .\n[3]	R. Tautz\, E. Da Como\, T. Limmer\, J. Feldmann\, H.-J. Egelhaaf\, 
 E. von Hauff\, V. Lemaur\, D. Beljonne\, S. Yilmaz\, I. Dumsch\, S. Allard
 \, U. Scherf\, Nat Commun 2012\, 3\, 970.\n[4]	R. Tautz\, E. Da Como\, C. 
 Wiebeler\, G. Soavi\, I. Dumsch\, N. Frohlich\, G. Grancini\, S. Allard\, 
 U. Scherf\, G. Cerullo\, S. Schumacher\, J. Feldmann\, J. Am. Chem. Soc. 2
 013\, 135\, 4282-4290.
LOCATION:Kapitza Building Seminar Room\, Cavendish Laboratory\, Department
  of Physics
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