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SUMMARY:High mobility soluble polyacene–dielectric polymer formulations 
 - a facile approach to large area printed electronics - Professor Stephen 
 Yeates\, School of Chemistry\, The University of Manchester\,
DTSTART:20091106T143000Z
DTEND:20091106T153000Z
UID:TALK20047@talks.cam.ac.uk
CONTACT:Dr. Z Chen
DESCRIPTION:OTFTs have become increasingly more attractive for various ele
 ctronic applications mainly due to potentially low cost solution processab
 ility\, and potential for migration to flexible substrates. However OTFTs 
 cannot achieve the high switching frequency of single crystalline silicon 
 because of the inherently lower mobility and structural disorder of organi
 c compounds in the solid state. 6\, 13 substituted pentacene’s have been
  the subject of intensive recent investigation attempting to combine good 
 low cost solution processability with high performance [1].\nHere we prese
 nt the result of influence of film processing condition as well as formula
 tion on thinf film transistor characeristics when a new pentacene derivati
 ve (1\,4\,8\,11 methyl substituted 6\,13 triethylsilylethynylpentacene (TM
 TES-Pentacene)) is used. This new molecule. shows extended pi-pi overlap w
 hen deposited from solution yielding organic thin film transistors with hi
 gh and reproducible hole mobility in excess of 2 cm2/Vs with Ion/off > 107
  and negligible hysteresis. It is found that OTFT performance of the organ
 ic semiconductor is retained when blended with both amorphous and crystall
 ine side chain aromatic dielectric polymers even at volume fractions < 0.1
  offering the potential for the formulation of cost effective semiconducti
 ng inks.\n
LOCATION:Kapitza Building Seminar Room\, Cavendish Laboratory\, Department
  of Physics
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