Title

Multimorphism in molecular monolayers: Pentacene on Cu(110)

Authors

Authors

K. Muller; A. Kara; T. K. Kim; R. Bertschinger; A. Scheybal; J. Osterwalder;T. A. Jung

Comments

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Abbreviated Journal Title

Phys. Rev. B

Keywords

ab initio calculations; carrier mobility; charge injection; copper; electron diffraction; monolayers; organic semiconductors; scanning; tunnelling microscopy; semiconductor-metal boundaries; thermodynamics; TOTAL-ENERGY CALCULATIONS; AUGMENTED-WAVE METHOD; ORGANIC TRANSISTORS; ORDERED STRUCTURES; EPITAXIAL-GROWTH; INDUCED SURFACE; THIN-FILMS; BASIS-SET; AU(110); ADSORPTION; Physics, Condensed Matter

Abstract

The architecture of the contacting interface between organic molecular semiconductors and metallic or insulating substrates determines its cooperative properties such as the charge injection and the charge-carrier mobility of organic thin-film devices. This paper contributes a systematic approach to reveal the evolution of the different structural phases of pentacene on Cu(110) while using the same growth conditions. Complementary measurement techniques such as scanning tunneling microscopy and low-energy electron diffraction together with ab initio calculations are applied to reveal the complex multiphase behavior of this system at room temperature. For coverages between 0.2 and 1 monolayer (ML) a complex multiphase behavior comprising five different phases is observed, which is associated to the interplay of molecule/molecule and molecule/substrate interactions. Multimorphism critically depends on the thermodynamics and kinetics determined by the growth parameters as well as the system itself and arises from shallow energy minima for structural rearrangements. In consequence, the multimorphism affects the interface structure and therefore the interface properties.

Journal Title

Physical Review B

Volume

79

Issue/Number

24

Publication Date

1-1-2009

Document Type

Article

Language

English

First Page

7

WOS Identifier

WOS:000267699700128

ISSN

1098-0121

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