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

被引：60

作者：

Yokoyama, Daisuke ^{[1
,2
]}

Sakaguchi, Akio ^{[3
]}

Suzuki, Michio ^{[3
]}

Adachi, Chihaya ^{[1
,2
]}

机构：

[1] Kyushu Univ, Ctr Future Chem, Nishi Ku, Fukuoka 8190395, Japan

[2] Life BEANS Ctr Kyushu, BEANS Lab, Nishi Ku, Fukuoka 8190395, Japan

[3] JA Woollam Japan Corp, Tokyo 1670051, Japan

来源：

APPLIED PHYSICS LETTERS | 2009年 / 95卷 / 24期

关键词：

amorphous state; electron mobility; electronic structure; organic compounds; thin films; vacuum deposited coatings; CHARGE-TRANSPORT; EFFICIENT; MOBILITY;

D O I：

10.1063/1.3274135

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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 pi-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.

引用

页数：3

共 28 条

[1] ORGANIC ELECTROLUMINESCENT DEVICE HAVING A HOLE CONDUCTOR AS AN EMITTING LAYER [J].