Enhancement of electron transport by horizontal molecular orientation of oxadiazole planar molecules in organic amorphous films

Daisuke Yokoyama, Akio Sakaguchi, Michio Suzuki, Chihaya Adachi

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

To demonstrate the effect of molecular orientation on charge transport characteristics in vacuum-deposited organic amorphous films, the electrical and optical properties of films of two oxadiazole derivatives were investigated. One of them has bulky tert-butyl terminals and forms an isotropic film, whereas the other has planar bipyridyl terminals and forms a highly anisotropic film. The very large optical anisotropy of the latter means that the planar molecules stack horizontally, leading to large overlaps of π -orbitals and more than 30 times higher electron mobility though the geometric and electronic structures of the main conformers of the two derivatives are quite similar.

Original languageEnglish
Article number243303
JournalApplied Physics Letters
Volume95
Issue number24
DOIs
Publication statusPublished - Dec 14 2009

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augmentation
molecules
electrons
electron mobility
electrical properties
electronic structure
optical properties
orbitals
vacuum
anisotropy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Enhancement of electron transport by horizontal molecular orientation of oxadiazole planar molecules in organic amorphous films. / Yokoyama, Daisuke; Sakaguchi, Akio; Suzuki, Michio; Adachi, Chihaya.

In: Applied Physics Letters, Vol. 95, No. 24, 243303, 14.12.2009.

Research output: Contribution to journalArticle

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