Effect of air exposure on metal/organic interface in organic field-effect transistors

Xubing Lu, Takeo Minari, Akichika Kumatani, Chuan Liu, Kazuhito Tsukagoshi

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

We report the effect of air exposure on charge injection process through the metal/organic interface in organic field-effect transistors. Pentacene-based field-effect transistors and metal-insulator-semiconductor capacitors having gold or copper contact were fabricated without exposing to air. An air exposure caused remarkable improvement on the electrical characteristics of the devices, particularly on the contact resistance and frequency response characteristics. Measurements of photoelectron yield spectroscopy revealed that natural oxidation significantly shifted the work function of contact metal and thus charge injection efficiency was improved. This result provides critical insights on control of desirable metal/organic interface in organic electronics devices.

Original languageEnglish
Article number243301
JournalApplied Physics Letters
Volume98
Issue number24
DOIs
Publication statusPublished - 2011 Jun 13
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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