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UID:20250731T195008EDT-1319cxVugs@132.216.98.100
DTSTAMP:20250731T235008Z
DESCRIPTION:For over 7 years my group has been fascinated by how tellurium 
 and selenium can influence the optoelectronic properties of conjugated ele
 ctronic materials. Some of our work has focused on the development of conj
 ugated polymers that self-organize at the nanoscale by spontaneous phase-s
 eparation. We have been interested in conjugated block copolymers where ea
 ch block contains a distinct heterocycle. These polymers are fundamentally
  important for testing the limits of polymer phase separation. They are al
 so useful in optoelectronic devices where nanoscale structure is important
 \, such as solar cells. In this context we have developed selenophene-thio
 phene block copolymers and discovered that these copolymers undergo a sign
 ificant amount of phase separation. This is surprising given the chemical 
 similarity of the repeat units\, however we have uncovered several propert
 ies\, including crystal packing\, that differ in these polyheterocycles. B
 y increasing the compatibility of the selenophene and thiophene units and 
 we observe co-crystallization in statistical copolymers.  These statistica
 l copolymers form nanowires and when fabricated into nanowire solar cells 
 they operate with a greater efficiency than cells composed of homopolymer 
 nanowires. We have also learned how to synthesize polymers and delocalized
  molecules based on tellurophene\, and identified several unexpected prope
 rties in these materials including reversible binding of small molecules\,
  and the ability to photo-reductively eliminate halogens. The synthesis\, 
 properties and optical applications of these materials will be discussed.
 \n
DTSTART:20170321T170000Z
DTEND:20170321T181500Z
LOCATION:Room 10\, Maass Chemistry Building\, CA\, QC\, Montreal\, H3A 0B8\
 , 801 rue Sherbrooke Ouest
SUMMARY:CSACS Seminar: Dwight Seferos - Conjugated Polymers that Contain Se
 lenium and Tellurium
URL:/channels/event/csacs-seminar-dwight-seferos-conju
 gated-polymers-contain-selenium-and-tellurium-265402
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