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PRODID:https://murmitoyen.com/events/vanille/udem/
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UID:69dfe204aa011
DTSTAMP:20260415T150748
DTSTART:20140430T110000
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TRANSP:OPAQUE
DTEND:20140430T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/250413
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Conférence du Professeur John Anthony (Kentucky)
DESCRIPTION:Titre :  Functional Applications of Crystalline Acenes and Het
 eroacenes.La conférence sera prononcée par le professeur John Anthony du
  Département de chimie de l'University of Kentucky. Elle sera donnée en 
 anglais. Résumé : The ease with which small carbon-rich molecules can b
 e functionalized allows a single chromophore framework to be tuned for use
  in a myriad of electronic applications. Careful selection of substituents
  allows tuning of both solubility and crystal packing\, which is important
  for the improvement of both film morphology and charge transport. Additio
 nal substituents on the chromophore can be added to improve stability\, sh
 ift phase transitions\, or change the dominant carrier type for the materi
 al. Using 4\, 5 and 6 fused-ringed acenes and heteroacenes as the chromoph
 ore\, our functionalization approach has created organic materials for use
  in high-performance organic transistors and organic solar cells. The crys
 tal-packing arrangements for these two types of devices are dramatically d
 ifferent. This talk will examine how materials with two-dimensional\, laye
 red pi-stacking arrangements yield high-performance transistors\, and how 
 subtle tuning of the substituents can further improve performance. In the 
 case of bulk heterojunction organic solar cells\, substitution of the acen
 e chromophore with small electron-withdrawing groups yielded effective acc
 eptors in blends with polythiophene donors. In this case\, materials with 
 strong pi-stacking interactions yielded the poorest-performing solar cells
 \, while those with weak\, 1-dimensional pi-stacking interactions yielded 
 the best performance.  The subtle interplay between the native characteri
 stics of the carbon-rich chromophore and the changes in intermolecular cou
 pling afforded by fine-tuning crystal packing become a powerful tool for o
 ptimizing acene-based materials for a wide variety of applications.Informa
 tion supplémentaire
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