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SUMMARY:IMX Colloquium - Flexible Nanoscale Organic Thin-Film Transistors
DTSTART:20251110T131500
DTEND:20251110T141500
DTSTAMP:20260921T212256Z
UID:216eb8efc3a3a8b5075e67be9d8058754edf9d83a8e6917e0d8c967a
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Hagen Klauk\, Solid State Research\, Max Planck Institute\
 , Germany\nOrganic thin-film transistors (TFTs) can often be fabricated at
  temperatures around or below 100 degrees Celsius and thus on a wide range
  of unconventional substrates\, including flexible and transparent polymer
 s\, such as polyethylene naphthalate (PEN). This makes organic TFTs a pote
 ntial alternative to TFTs based on inorganic semiconductors\, such as low-
 temperature polycrystalline silicon (LTPS)\, which typically require highe
 r process temperatures that limit the choice of flexible substrate materia
 ls to ultrathin glass and polyimide. For circuit and display applications\
 , an important TFT parameter is the transit frequency\, which is the highe
 st frequency at which the transistors are able to switch or amplify electr
 ical signals. A field-effect transistor’s transit frequency depends crit
 ically on the channel length and the parasitic gate-to-source and gate-to-
 drain overlaps. Most of the highest transit frequencies reported for organ
 ic TFTs to date have been achieved with channel lengths and gate-to-contac
 t overlaps of around 1 µm. To explore the static and dynamic performance 
 of flexible organic TFTs with nanoscale dimensions\, we have used electron
 -beam lithography and fabricated low-voltage organic TFTs with channel len
 gths and gate-to-contact overlaps as small as 100 nm on flexible PEN subst
 rates. These TFTs display useful static and dynamic characteristics\, incl
 uding on/off current ratios of 10 orders of magnitude\, subthreshold swing
 s below 100 mV/decade\, turn-on voltages of 0 V\, negligible threshold-vol
 tage roll-off\, contact resistances below 500 Ohm-cm\, and switching delay
 s below 50 ns.\n\nBio: Hagen Klauk received the Ph.D. degree in electrica
 l engineering from the Pennsylvania State University in 1999. From 1999 to
  2000\, he was a Postdoctoral Researcher at Penn State. In 2000\, he joine
 d Infineon Technologies\, Erlangen\, Germany. Since 2005\, he has been hea
 d of the Organic Electronics group at the Max Planck Institute for Solid S
 tate Research\, Stuttgart\, Germany. His research focuses on organic thin-
 film transistors.
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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