Low-voltage ambipolar phototransistors based on a pentacene/PC 61BM heterostructure and a self-assembled nano-dielectric

J. G. Labram, P. H. Wöbkenberg, D. D.C. Bradley, T. D. Anthopoulos

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

Low-voltage ambipolar organic phototransistors based on a pentacene/[6,6]-phenyl-C61-butyric acid methyl ester heterostructure as the semiconducting layer and a self-assembled monolayer as the gate dielectric, are demonstrated. The transistors are shown to operate below |3| V with electron and hole mobilities on the order of 0.1 and 10-3 cm2/Vs, respectively. Importantly the channel current is found to depend not only on the biasing conditions but also on the intensity of incident light, allowing the device to be used as an optical sensor. The external quantum efficiency and response time of these low-power phototransistors are calculated to be -0.8% and 210-225 ms, respectively. By integrating two such ambipolar phototransistors, low-voltage, light-sensitive complementary-like integrated circuits such as voltage inverters are also realised. The present results demonstrate the potential of organic phototransistors for low-power optoelectronic applications. © 2010 Elsevier B.V. All rights reserved.
Original languageEnglish (US)
Pages (from-to)1250-1254
Number of pages5
JournalOrganic Electronics
Volume11
Issue number7
DOIs
StatePublished - Jan 1 2010
Externally publishedYes

Keywords

  • Integrated circuits
  • Low-voltage transistor
  • Organic transistor
  • Phototransistor
  • Self-assembling monolayer dielectric

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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