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Imaging and Elemental Analysis of Polymer/Fullerene Nanocomposite Memory Devices

Published online by Cambridge University Press:  01 February 2011

Ari Laiho ,
Jayanta K. Baral ,
Himadri S. Majumdar ,
Daniel Tobjörk ,
Janne Ruokolainen ,
Ronald Österbacka  and
Olli Ikkala
Ari Laiho
Affiliation:
ari.laiho@tkk.fi, Helsinki University of Technology, Department of Engineering Physics and Center for New Materials, P.O. Box 5100, FIN-02015 TKK, Finland, Espoo, 02015, Finland
Jayanta K. Baral
Affiliation:
jbaral@abo.fi, Åbo Akademi University, Department of Physics and Center for Functional Materials, Porthansgatan 3, FIN-20500, Turku, N/A, Finland
Himadri S. Majumdar
Affiliation:
hmajumda@abo.fi, Åbo Akademi University, Department of Physics and Center for Functional Materials, Porthansgatan 3, FIN-20500, Turku, N/A, Finland
Daniel Tobjörk
Affiliation:
dtobjork@abo.fi, Åbo Akademi University, Department of Physics and Center for Functional Materials, Porthansgatan 3, FIN-20500, Turku, N/A, Finland
Janne Ruokolainen
Affiliation:
janne.ruokolainen@tkk.fi, Helsinki University of Technology, Department of Engineering Physics and Center for New Materials, P.O. Box 5100, FIN-02015 TKK, Espoo, N/A, Finland
Ronald Österbacka
Affiliation:
rosterba@abo.fi, Åbo Akademi University, Department of Physics and Center for Functional Materials, Porthansgatan 3, FIN-20500, Turku, N/A, Finland
Olli Ikkala
Affiliation:
olli.ikkala@tkk.fi, Helsinki University of Technology, Department of Engineering Physics and Center for New Materials, P.O. Box 5100, FIN-02015 TKK, Espoo, N/A, Finland
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Abstract

In this report we study the morphology and chemical composition of a nanocomposite memory device where the active device layer is sandwiched between two aluminum electrodes and consists of a nanocomposite of polystyrene (PS) and [6,6]-phenyl-C61 butyric acid methyl ester (PCBM). The morphology of the active layer is imaged both in plan-view and cross-sectional view by using transmission electron microscopy (TEM). We introduce two techniques to prepare the cross-sections from the active layer, namely, a conventional technique based on microtoming and secondly nanostructural processing with focused ion beam (FIB). Based on the morphology studies we deduce that within the used concentrations the PCBM forms spherical nanoscale clusters within the continuous PS matrix. The chemical composition of the device is determined by using X-ray photoelectron spectroscopy (XPS) and it shows that the thermal evaporation of the aluminum electrodes does not lead to observable inclusion of the aluminum into the active material layer.

Keywords

memorynanostructuretransmission electron microscopy (TEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1071: Symposium F – Materials Science and Technology for Nonvolatile Memories , 2008 , 1071-F04-04
Copyright
Copyright © Materials Research Society 2008

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References

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