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Browse Journals & Magazines > Applied Physics Letters ...> Volume:93 Issue:10 Help

Enhancement of electron injection into a light-emitting polymer from an aluminum oxide cathode modified by a self-assembled monolayer

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4 Author(s)
Vaynzof, Yana ; Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA ; Dennes, T.Joseph ; Schwartz, Jeffrey ; Kahn, Antoine

Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.2980425 

A self-assembled monolayer (SAM) of octylphosphonate was deposited on an AlOx electrode using the tethering by aggregation and growth (T-BAG) procedure. Ultraviolet photoemission spectroscopy (UPS) measurements showed a decrease in the substrate work function from 3.8 to 3.3 eV. Poly[9,9′-dioctylfluorene-co-bis-N,N′-(4-butylphenyl)-diphenylamine] (TFB) films spin coated on the bare and the SAM-modified oxide surfaces were investigated by UPS. A shift in molecular levels, corresponding to a reduction in the electron injection barrier, was observed for the SAM-modified electrode. This barrier lowering was confirmed by current-voltage measurements showing a corresponding increase in electron current through the TFB/SAM/AlOx device.

Published in:
Applied Physics Letters  (Volume:93 ,  Issue: 10 )

Date of Publication: Sep 2008

Page(s):
103305 - 103305-3
ISSN :
0003-6951
Digital Object Identifier :
10.1063/1.2980425
Product Type:
Journals & Magazines
Date of Current Version :
18 June 2009
Issue Date :
Sep 2008

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