STM investigation of vapor-deposition polymerization

We present a study of vapor-deposition polymerization (VDP) to produce thin layers of poly(phenylquinoxaline) (PPQ), a material that can be used as an electron-transport layer in multilayer organic electroluminescent devices. The polymer is prepared by the thermally-induced polycondensation reaction...

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Bibliographic Details
Published in:Organic electronics 2001-09, Vol.2 (2), p.75-82
Main Authors: Alvarado, S.F, Rieß, W, Jandke, M, Strohriegl, P
Format: Article
Language:English
Subjects:
Poly(phenylquinoxaline)
STM
Vapor-deposition polymerization
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Summary:We present a study of vapor-deposition polymerization (VDP) to produce thin layers of poly(phenylquinoxaline) (PPQ), a material that can be used as an electron-transport layer in multilayer organic electroluminescent devices. The polymer is prepared by the thermally-induced polycondensation reaction of 1,3-bis(phenylglyoxaloyl)benzene and 3,3 ′-diaminobenzidine. The two monomers are deposited by evaporation onto an atomically clean Au(111) surface under ultrahigh-vacuum conditions. Polymer formation is monitored in situ by scanning tunneling microscopy. Photoluminscence (PL) spectroscopy measurements, performed in situ, reveal that the PL spectrum of the VDP product corresponds to a reference spectrum for solution-synthesized PPQ. For monolayer coverage, polymer clusters are formed with the chains oriented parallel to each other. STM images suggest that the VDP-prepared films can be much smoother and more uniform than films deposited by spin coating.
ISSN:1566-1199
1878-5530
DOI:10.1016/S1566-1199(01)00012-X