Local carrier dynamics in organic thin film transistors investigated by time-resolved Kelvin probe force microscopy

Yuji Yamagishi, Kei Kobayashi, Tomoharu Kimura, Kei Noda, Hirofumi Yamada

研究成果: Article査読

1 被引用数 (Scopus)

抄録

Understanding the relationship between the microscopic structures and the carrier transport properties in organic electronic materials is of fundamental interest to exploit the potential of the materials and thus to realize highly efficient organic devices. In this study, carrier ejection processes in polycrystalline organic thin film transistors are investigated by time-resolved Kelvin probe force microscopy (tr-KPFM) that is capable of visualizing time evolution of the surface potential triggered by the application of a voltage pulse with a temporal resolution of 3 ms. The obtained tr-KPFM images show that the spatial distribution of the diffusing charge carriers is mostly non-homogeneous, reflecting the complex resistivity distribution in the channel region formed by the crystalline grains. The trapped charges in some grains diffuse to the electrodes on a time scale of several tens of milliseconds due to the low contact resistance of the grain boundaries, while most of the trapped charges diffuse on a time scale of hundreds of milliseconds.

本文言語English
ページ(範囲)118-122
ページ数5
ジャーナルOrganic Electronics
57
DOI
出版ステータスPublished - 2018 6

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 生体材料
  • 化学 (全般)
  • 凝縮系物理学
  • 材料化学
  • 電子工学および電気工学

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