Interface and gate bias dependence responses of sensing organic thin-film transistors

Biosens Bioelectron. 2005 Nov 15;21(5):782-8. doi: 10.1016/j.bios.2005.01.016.

Abstract

The effects of the exposure of organic thin-film transistors, comprising different organic semiconductors and gate dielectrics, to 1-pentanol are investigated. The transistor sensors exhibited an increase or a decrease of the transient source-drain current in the presence of the analyte, most likely as a result of a trapping or of a doping process of the organic active layer. The occurrence of these two effects, that can also coexist, depend on the gate-dielectric/organic semiconductor interface and on the applied gate field. Evidence of a systematic and sizable response enhancement for an OTFT sensor operated in the enhanced mode is also presented.

Publication types

  • Evaluation Study
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Amplifiers, Electronic*
  • Artifacts*
  • Biosensing Techniques / instrumentation*
  • Biosensing Techniques / methods
  • Electric Conductivity
  • Equipment Design
  • Equipment Failure Analysis
  • Membranes, Artificial
  • Organic Chemicals / analysis*
  • Organic Chemicals / chemistry*
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Transistors, Electronic*

Substances

  • Membranes, Artificial
  • Organic Chemicals