Tuning the ionization energy of organic semiconductor films: The role of intramolecular polar bonds

被引：145

作者：

Salzmann, Ingo ^{[1
]}

Duhm, Steffen ^{[1
]}

Heimel, Georg ^{[1
]}

Oehzelt, Martin ^{[2
]}

Kniprath, Rolf ^{[1
]}

Johnson, Robert L. ^{[3
]}

Rabe, Juergen P. ^{[1
]}

Koch, Norbert ^{[1
]}

机构：

[1] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany

[2] Johannes Kepler Univ Linz, Inst Expt Phys, A-4040 Linz, Austria

[3] Univ Hamburg, Inst Expt Phys, D-22761 Hamburg, Germany

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2008年 / 130卷 / 39期

关键词：

D O I：

10.1021/ja804793a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

For the prototypical conjugated organic molecules pentacene and perfluoropentacene, we demonstrate that the surface termination of ordered organic thin films with intramolecular polar bonds (e.g., -H versus -F) can be used to tune the ionization energy. The collective electrostatics of these oriented bonds also explains the pronounced orientation dependence of the ionization energy. Furthermore, mixing of differently terminated molecules on a molecular length scale allows continuously tuning the ionization energy of thin organic films between the limiting values of the two pure materials. Our study shows that surface engineering of organic semiconductors via adjusting the polarity of intramolecular bonds represents a generally viable alternative to the surface modification of substrates to control the energetics at organic/(in)organic interfaces.

引用

页码：12870 / +

页数：3

共 16 条

[1] Electron energetics at surfaces and interfaces: Concepts and experiments [J].