BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Comparison of the Field and Fermi Level Dependence of Transport an
 d Recombination in Polymer/C60 Cells and Solid-State Dye-Sensitized Cells.
  - Dr. Brian C. O'Regan - Dept of Chemistry and Physics\, Imperial College
  London
DTSTART:20060616T143000Z
DTEND:20060616T153000Z
UID:TALK4967@talks.cam.ac.uk
CONTACT:spl37
DESCRIPTION:Simultaneous transient absorption and transient photovoltage/p
 hotocurrent studies on complete P3HT/PCBM solar cells allows measurement o
 f the field dependence of transport\, charge mobility\, and charge recombi
 nation in the blend layer.  Because the transient absorption measurements 
 are done by reflection of the probe beam off the aluminum electrode we do 
 optical and electrical characterization of the same device.  Analogous stu
 dies on liquid-junction and solid-state dye-sensitized cells allow us to c
 ompare the differing contributions of drift and diffusion to both transpor
 t and recombination across the three main types of "bulk heterojunction" c
 ells.  We find evidence for a contribution of electric field to the charge
  transport in the solid-state dye cells. Additional temperature dependence
  studies allow measurement of activation energies which illuminates the co
 ntribution of trapping and detrapping to all processes. \n
LOCATION: IRC in Superconductivity Seminar room
END:VEVENT
END:VCALENDAR