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SUMMARY:Insight into the synthesis and processing of narrow band gap organ
 ic semiconducting polymers for solar cell fabricationTitle to be confirmed
  - SpeaGuillermo C. Bazan Department of Materials\, University of Californ
 ia\, Santa Barbara\, CA 93106\, USA\;ker to be confirmed
DTSTART:20101126T100000Z
DTEND:20101126T110000Z
UID:TALK28141@talks.cam.ac.uk
CONTACT:Leona Hope-Coles
DESCRIPTION:High charge separation efficiency combined with the reduced fa
 brication costs associated with solution processing (printing and coating)
  and the potential for implementation on flexible substrates make “plast
 ic” solar cells a compelling option for tomorrow’s photovoltaics. The 
 control the donor/acceptor morphology in bulk heterojunction materials as 
 required for achieving high power conversion efficiency have is therefore 
 of primary concern. We showed that by incorporating a few volume percent o
 f high boiling point additive\, the power conversion efficiency of photovo
 ltaic cells (AM 1.5 conditions) is increased from 2.8% to 5.5%.  Subsequen
 t efforts centered on understanding the mechanism of action of the additiv
 es and this will be discussed in some detail .  More recently\, the improv
 ed synthesis of polymers has been studied\, in particular those backbone s
 ystems that lead to aggregation in solution and high performance devices. 
  We will present polymerization procedures that lead to high molecular wei
 ght product in short reaction times and involve simple purification protoc
 ols.  Emerging structure/function relationships will be examined\, as well
  as those polymer systems that allow fabrication of devices that have powe
 r conversion efficiencies approaching 6 %.\n \n
LOCATION:Pippard Lecture Theatre\, Cavendish Laboratory\, Department of Ph
 ysics
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