The direct measurement of energy barrier height at metal/ polyfluorene derivatives interface by internal photoemission spectroscopy

Eiji Itoh, Shinya Takaishi

研究成果: Conference contribution

抄録

We have investigated the barrier height for electron injection at the cathode / polyfluorene derivatives interface by the internal photoemission (IPE) spectroscopy techniques using the "electron only device" structure consisting of TiO 2, electron transporting polyimide inter-layer (IL), and polyfluorene derivatives. We also estimated the barrier height by the current analysis based on the Schottky thermal emission current model, and it coincides well to the threshold energy of IPE result only when the energy is lower than 1.1eV. The measured barrier height obtained by IPE linearly increases with both the work-function of cathode materials. However, the slope parameter becomes less than 1 (∼0.6) for poly (9,9-dioctylfluorene) (F8) probably due to the interfacial gap states. On the other hand, the slope parameter becomes very small (∼0.18) for the poly (9,9-dioctylfluorene)-co- benzo- thiadiazole) (F8BT) probably due to the electron pinning at the cathode/ acceptor interface.

本文言語English
ホスト出版物のタイトルMolecular and Hybrid Materials for Electronics and Photonics
ページ72-77
ページ数6
DOI
出版ステータスPublished - 2011
外部発表はい
イベント2010 MRS Fall Meeting - Boston, MA, United States
継続期間: 2010 11 292010 12 3

出版物シリーズ

名前Materials Research Society Symposium Proceedings
1286
ISSN(印刷版)0272-9172

Other

Other2010 MRS Fall Meeting
国/地域United States
CityBoston, MA
Period10/11/2910/12/3

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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