1 Volt organic transistors with mixed self-assembled monolayer/Al2O3 gate dielectrics

Research output: Contribution to journalArticle

  • External authors:
  • Barbara Urasinska-Wojcik
  • Nicolas Cocherel
  • Richard Wilson
  • Jeremy Burroughes
  • Jesse Opoku


Control of the threshold voltage and the subthreshold swing is critical for low voltage transistor operation. In this contribution, organic field-effect transistors (OFETs) operating at 1 V using ultra-thin (∼4 nm), self-assembled monolayer (SAM) modified aluminium oxide layers as the gate dielectric are demonstrated. A solution-processed donor–acceptor semiconducting polymer poly(3,6-di(2-thien-5-yl)-2,5-di(2-octyldodecyl)-pyrrolo[3,4-c]pyrrole-1,4-dione)thieno[3,2-b]thiophene) (PDPP2TTT) is used as the active layer. It is shown that the threshold voltage of the fabricated transistors can be simply tuned by carefully controlling the composition of the applied SAM. The optimised OFETs display threshold voltages around 0 V, low subthreshold slopes (150 ± 5 mV/dec), operate with negligible hysteresis and show average saturated field-effect mobilities in excess of 0.1 cm2/V s at 1 V.

Bibliographical metadata

Original languageEnglish
Pages (from-to)20-24
Number of pages5
JournalOrganic Electronics
StatePublished - 1 Nov 2015