Polymer dielectric layer functionality in organic field-effect transistor based ammonia gas sensor

Wei Huang, Junsheng Yu*, Xinge Yu, Wei Shi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

Ammonia (NH3) gas sensors based on pentacene organic field-effect transistors (OFETs) are fabricated using polymers as the dielectric. Compared with those incorporating poly(vinyl alcohol), poly(4-vinylphenol) or poly(methyl methacrylate) dielectric, a low detect limitation of 1 ppm and enhanced recovery property are obtained for OFETs with polystyrene (PS) as gate dielectric. By analyzing the morphologies of pentacene and electrical characteristics of the OFETs under various concentrations of NH3, the variations of the sensing properties of different dielectrics based OFET-sensors are proved to be mainly caused by the diversities of dielectric/pentacene interfacial properties. Furthermore, low surface trap density and the absence of polar groups in PS dielectric are ascribed to be responsible for the high performance of NH3 sensors.

Original languageEnglish (US)
Pages (from-to)3453-3459
Number of pages7
JournalOrganic Electronics
Volume14
Issue number12
DOIs
StatePublished - Jan 1 2013

Keywords

  • Ammonia sensor
  • Low detect limitation
  • Organic field-effect transistors (OFETs)
  • Polymer dielectric
  • Recovery property

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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