Orientation Control of Linear-Shaped Molecules in Vacuum-Deposited Organic Amorphous Films and Its Effect on Carrier Mobilities

被引：166

作者：

Yokoyama, Daisuke ^{[1
,2
]}

Setoguchi, Yousuke ^{[1
]}

Sakaguchi, Akio ^{[3
]}

Suzuki, Michio ^{[3
]}

Adachi, Chihaya ^{[1
,2
]}

机构：

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

[2] BEANS Lab, Chiyoda Ku, Tokyo 1010026, Japan

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

来源：

ADVANCED FUNCTIONAL MATERIALS | 2010年 / 20卷 / 03期

关键词：

DENSITY-FUNCTIONAL THEORY; CHARGE-TRANSPORT; ENERGIES;

D O I：

10.1002/adfm.200901684

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The molecular orientation of linear-shaped molecules in organic amorphous films is demonstrated to be controllable by the substrate temperature. It is also shown that the molecular orientation affects the charge-transport characteristics of the films. Although linear-shaped 4,4'-bis[{N-carbazole}styryl]biphenyl molecules deposited on substrates at room temperature are horizontally oriented in amorphous films, their orientation when deposited on heated substrates with smooth surfaces becomes more random as the substrate temperature increases, even at temperatures under the glass transition temperature. Another factor dominating the orientation of the molecules deposited on heated substrates is the surface roughness of the substrate. Lower carrier mobilities are observed in films composed of randomly oriented molecules, demonstrating the significant effect of a horizontal molecular orientation on the charge-transport characteristic of organic amorphous films.

引用

页码：386 / 391

页数：6

共 20 条

[1] 100% fluorescence efficiency of 4,4′-bis[(N-carbazole)styryl]biphenyl in a solid film and the very low amplified spontaneous emission threshold -: art. no. 071110 [J].