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SUMMARY:Alignment of π-conjugated semi-conducting polymers : epitaxy vers
 us mechanical rubbing
DTSTART:20140407T131500
DTSTAMP:20260510T055612Z
UID:880ee736c65bb353259f78002c20ac9ed83e61c3aa2c311706683fe9
CATEGORIES:Conferences - Seminars
DESCRIPTION:Martin Brinkmann\, Université de Strasbourg\, France\nConjug
 ated polymers e.g. regioregular poly(3-­‐hexylthiophene)  form a remar
 kable class of macromolecules with fascinating electronic properties as we
 ll as structural features that make them very different from more classica
 l and flexible polyolefins. In thin film devices\, the structure and the n
 ano-­‐morphology are two important parameters that control solid state 
 properties such as charge transport. Due to the high anisotropy of electro
 nic properties in conjugated polymers\, it is essential to control both th
 e crystallization and the domain orientation over large length scales in t
 hin films. This seminar focuses on two approaches developped in our group 
 to achieve this aim\, namely epitaxial crystallization (1\,2\,3) and mecha
 nical rubbing (4\,5). We present various results illustrating the control 
 over orientation and structure made possible by these two methods  and  
 the  peculiar  morphological  and  structural  aspects  revealed  b
 y Transmission Electron Microscopy (TEM). The use of TEM is shown to shed 
 some new light  on  the  intriguing  crystallization\,  structure  a
 nd  growth  of  these  key  functional polymers.\n(1) M. Brinkmann an
 d P. Rannou\, Adv. Funct. Mat.\, 2007\,17\, 101.\n(2) N. Kayunkid\, S. Utt
 iya and M. Brinkmann\, Macromolecules 2010\, 43\, 4961.\n(3) M. Brinkmann\
 ,  E. Gonthier\,  S. Bogen\,  K. Tremmel\,  S. Ludwigs\,  M. Hufnagel
 \,  M. Sommer\,  ACS Nano\,\n2012\, 6\, 10319.\n(4) Hartmann\, L.\; Trem
 el\, K.\; Uttiya\, S.\; Crossland\, E.\; Kayunkid\, N.\; Ludwigs\, S.\; Ve
 rgnat\, C.\; Brinkmann\, M.\nAdv. Funct. Mat. 2011\, 21\, 4047.\n(5) L. Bi
 niek\, N. Leclerc\, T. Heiser\, M. Brinkmann\, Macromolecules 2013\, 46\, 
 4014.\nBio: Martin Brinkmann obtained his Ph. D. in physics from the Univ
 ersity of Strasbourg in 1997.\nHe spent several years as a postdoctoral fe
 llow at CNR in Bologna and the Massachussetts Institue of Technology in Ca
 mbridge (U.S.A) before moving to the Institut Charles Sadron (CNRS) in Str
 asbourg in 2000 as a senior scientist. He investigates fundamental aspects
  of organic thin film growth and structure\, especially epitaxy of π-conj
 ugated materials using Transmission Electron Microscopy
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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