Origin of low-frequency noise in pentacene field-effect transistors

Yong Xu, Takeo Minari, Kazuhito Tsukagoshi, Jan Chroboczek, Francis Balestra, Gerard Ghibaudo

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

Measurements of power spectral density (PSD) of low-frequency noise (LFN) in pentacene field-effect transistors reveal the preponderance of a 1/f-type PSD behavior with the amplitude varying as the squared transistor gain and increasing as the inverse of the gate surface area. Such features impose an interpretation of LFN by carrier number fluctuations model involving capture/release of charges on traps uniformly distributed over the gate surface. The surface slow trap density extracted by the noise analysis is close to the surface states density deduced independently from static I(V) data, which confirms the validity of the proposed LFN interpretation. Further, we found that the trap densities in bottom-contact (BC) devices were higher than in their top-contact (TC) counterparts, in agreement with observations of a poorer crystal structure of BC devices, in the contact regions in particular. At the highest bias the noise originating from the contact resistance is also shown to be a dominant component in the PSD, and it is well explained by the noise originating from a gate-voltage dependent contact resistance. A gate area scaling was also performed, and the good scaling and the dispersion at the highest bias confirm the validity of the applied carrier number fluctuations model and the predominant contact noise at high current intensities.

Original languageEnglish
Pages (from-to)106-110
Number of pages5
JournalSolid-State Electronics
Volume61
Issue number1
DOIs
Publication statusPublished - 2011 Jul 1
Externally publishedYes

Keywords

  • Low-frequency noise
  • Organic transistors
  • Pentacene

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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