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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents

ID: 28650.0, MPI für Polymerforschung / MPI Polymerforschung
Epitaxial composite layers of electron donors and acceptors from very large polycyclic aromatic hydrocarbons
Authors:Samori, P.; Severin, N.; Simpson, C. D.; Müllen, Klaus; Rabe, J. P.
Date of Publication (YYYY-MM-DD):2002-08-14
Title of Journal:Journal of the American Chemical Society
Journal Abbrev.:J. Am. Chem. Soc.
Issue / Number:32
Start Page:9454
End Page:9457
Review Status:No review
Audience:Not Specified
Abstract / Description:Large polycyclic aromatic hydrocarbons (PAHs) can be considered as nanographenes, whose electron donating or accepting properties are controlled by their size and shape as well as functionalities in their periphery. Epitaxial thin films of them are targets for optoelectronic applications; however, large PAHs are increasingly difficult to process. Here we show that epitaxial layers of very large unsubstituted PAHs (C42H18 and C132H34), as well as a mixed layer of C42H18 with an electron acceptor, can be obtained by self-assembly from solution. The C132H34 is by far the largest nanographene that up to now has been processed into ordered thin films; due to its size it cannot be sublimed in a vacuum. Scanning tunneling microscopy (STM) studies reveal that the interaction with the substrate induces a strong perturbation of the electronic structure of the pure donor in the first epitaxial monolayer. In a second epitaxial layer with a donor acceptor stoichiometry of 2:1 the molecules are unperturbed.
Comment of the Author/Creator:Date: 2002, AUG 14
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Humboldt Univ, Dept Phys, D-10115 Berlin, Germany
Identifiers:ISI:000177358600043 [ID No:1]
ISSN:0002-7863 [ID No:2]
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