Different approaches to adjusting band offsets at intermolecular interfaces

Authors

Peter A. Dowben, University of Nebraska-LincolnFollow
Jie Xiao, University of Nebraska-LincolnFollow
Bo Xu, University of Nebraska-Lincoln
Andrei Sokolov, University of Nebraska-LincolnFollow
Bernard Doudin, Institut de Physique Applique de Physique et Chimie des Materiaux de Strasbourg, 23 rue du Loess, B.P. 20, 67034 Strasbourg Cedex 2, FranceFollow

Date of this Version

1-19-2008

Comments

Published in Applied Surface Science (2008); doi:10.1016/j.apsusc.2008.01.062. Copyright © 2008 Elsevier B.V. Used by permission. http://www.sciencedirect.com/science/journal/01694332

Abstract

We show that at the hetero-molecular interface, the molecular band offsets can be modified by either adjusting the dopant or dopant concentration of one or both molecular layers or by changing the dipole orientation at the intermolecular interface. Photoemission studies reveal the changes in electronic structure and diode devices exhibit conduction properties that are altered in response to changes to the molecular band offsets. As a demonstration, thin film copper phthalocyanine to crystalline ferroelectric copolymer poly(vinylidene fluoride with trifluoroethylene) heterojunction diodes, without additional dopants, are compared with doped polyaniline layers on the crystalline ferroelectric copolymer poly(vinylidene fluoride with trifluoroethylene).