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SUMMARY:Linking microstructure to transport at several lengthscales in con
 jugated polymers - Alberto Salleo\, Stanford University
DTSTART:20210309T160000Z
DTEND:20210309T170000Z
UID:TALK157621@talks.cam.ac.uk
CONTACT:Mengxia Liu
DESCRIPTION:Carrier mobility in conjugated polymers continues to increase 
 with recent reports of field-effect mobilities exceeding 10 cm2/V.s. Charg
 e transport is intrinsically dependent on processes occurring across multi
 ple lengthscales. In order to access order parameters at the molecular sca
 le we use charge modulation spectroscopy (CMS) combined with theory. This 
 technique allows us to further differentiate field-induced and doping-indu
 ced charges and study how their delocalization depends on local structure 
 and disorder. CMS of a model polythiophene system highlights how transport
  depends on both local order and mesoscale connectivity. As a result\, we 
 study the mesoscale organization of polymers using new techniques in the t
 ransmission electron microscope. By combining 4D STEM and HRTEM we are abl
 e to study the microstructure across a range of length-scales in real spac
 e and reciprocal space. These techniques are used on homopolymers and dono
 r-acceptor copolymers and allow to extract information about the microstru
 cture that is typically not visible by inspection. Microstructural analysi
 s at these lengthscales coupled with charge transport theory allows to bet
 ter understand the role of defects. Thus\, such multiscale studies of micr
 ostructure are instrumental in guiding our understanding of charge transpo
 rt in conjugated polymers.
LOCATION: https://zoom.us/j/91794014655?pwd=NFljRHpjS0J3Z1ZaemFWaTVLOTc4QT
 09  Meeting ID: 917 9401 4655 Passcode: 080277
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