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SUMMARY:	Crystallization and Structure Formation in Donor-Acceptor Block C
 opolymers for Applications in Organic Photovoltaics - Professor Thomas Thu
 rn-Albrecht\, Martin Luther Unversity\, Halle-Wittenberg\, Germany
DTSTART:20111118T140000Z
DTEND:20111118T150000Z
UID:TALK33202@talks.cam.ac.uk
CONTACT:Tracy Inman
DESCRIPTION:Polymer solar cells require a nanoscale structure of donor and
  acceptor materials in order to achieve efficient charge separation. This 
 is often realized in quenched phase separated blend systems. The exact adj
 ustment of the morphology in this case is an empirical process and the res
 ulting two-phase structure corresponds thermodynamically to a non-equilibr
 ium state. We explore the possibility to use the self-assembly of block co
 polymers comprising materials that are good electron and hole conductors t
 o generate thermodynamically stable\, nanoscale donor and acceptor domains
  on the scale of the exciton diffusion length. While some initial devices 
 have been fabricated\, detailed understanding of the complex process of st
 ructure formation processes in such materials is often lacking. We present
  a detailed structural study on a donor-acceptor block copolymer and relat
 ed model materials\, using small and wide angle x-ray scattering in combin
 ation with AFM. We discuss similarities and differences with many common b
 lock copolymers undergoing a liquid-liquid microphase separation. 
LOCATION:Pippard Lecture Theatre\, Cavendish Laboratory
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