Molecular order, charge injection efficiency and the role of intramolecular polar bonds at organic/organic heterointerfaces

Y. Wang, T. Matsushima, H. Murata, A. Fleurence, Y. Yamada-Takamura, R. Friedlein

研究成果: ジャーナルへの寄稿学術誌査読

7 被引用数 (Scopus)

抄録

The effect of orientational changes in thin films of the non-crystalline hole transport material α-N-N′-diphenyl N-N″-bis(1 naphthayl)-1,1′-biphenyl-4,4′-diamine (α-NPD) on the energy level alignment and the film electronic structure has been investigated by angle-resolved ultraviolet photoelectron spectroscopy and related to the transport characteristics of hole-only devices. Changes in the anisotropic α-sexithiophene (α-6T) substrate from a "standing" to a "flat" molecular orientation induced by mechanical rubbing lead to molecular order and a preferential orientation in subsequently deposited thin α-NPD films and cause a reduction of the charge injection barrier at the organic/organic interface. The results show that the height of this barrier is determined by the surface dipoles of the individual organic films that relate to the orientation of intramolecular polar bonds at the interface.

本文言語英語
ページ(範囲)1853-1858
ページ数6
ジャーナルOrganic Electronics
13
10
DOI
出版ステータス出版済み - 10月 2012
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 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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