Polarization-dependent photoinduced bias-stress effect in single-crystal organic field-effect transistors

Hyun Ho Choi, Hikmet Najafov, Nikolai Kharlamov, Denis V. Kuznetsov, Sergei I. Didenko, Kilwon Cho, Alejandro L. Briseno, Vitaly Podzorov

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Photoinduced charge transfer between semiconductors and gate dielectrics can occur in organic field-effect transistors (OFETs) operating under illumination, leading to a pronounced bias-stress effect in devices that are normally stable while operating in the dark. Here, we report an observation of a polarization-dependent photoinduced biasstress effect in two prototypical single-crystal OFETs, based on rubrene and tetraphenylbis(indolo{1,2-a})quinolin. We find that the decay rate of the source-drain current in these OFETs under illumination is a periodic function of the polarization angle of incident photoexcitation with respect to the crystal axes, with a periodicity of π. The angular positions of maxima and minima of the bias-stress rate match those of the optical absorption coefficient of the corresponding crystals. The analysis of the effect shows that it stems from a charge transfer of "hot" holes, photogenerated in the crystal within a very short thermalization length (≦μm) from the semiconductor-dielectric interface. The observed phenomenon is a type of intrinsic structure-property relationship, revealing how molecular packing affects parameter drift in organic transistors under illumination. We also demonstrate that a photoinduced charge transfer in OFETs can be used for recording rewritable accumulation channels with an optically defined geometry and resolution, which can be used in a number of potential applications.

Original languageEnglish (US)
Pages (from-to)34153-34161
Number of pages9
JournalACS Applied Materials and Interfaces
Volume9
Issue number39
DOIs
StatePublished - Oct 4 2017

All Science Journal Classification (ASJC) codes

  • General Materials Science

Keywords

  • Bias-stress effect
  • Memory
  • Mobility
  • Molecular crystal
  • Organic semiconductor
  • Organic transistor
  • Photoinduced charge transfer
  • Rubrene

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