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Investigation of the Temperature-Dependent Surface Morphology of p-Sexiphenyl Thin Films on KCl(001)

Published online by Cambridge University Press:  15 March 2011

E.J. Kintzel Jr ,
E.S. Gillman ,
J.G. Skofronick ,
S.A. Safron  and
D.-M. Smilgies
E.J. Kintzel Jr
Affiliation:
MARTECH and the Department of Physics and Chemistry, Florida State University Tallahassee, FL 32306, U.S.A.
E.S. Gillman
Affiliation:
Jefferson Lab, 12000 Jefferson Avenue Newport News, VA 23606, U.S.A.
J.G. Skofronick
Affiliation:
MARTECH and the Department of Physics and Chemistry, Florida State University Tallahassee, FL 32306, U.S.A.
S.A. Safron
Affiliation:
MARTECH and the Department of Physics and Chemistry, Florida State University Tallahassee, FL 32306, U.S.A.
D.-M. Smilgies
Affiliation:
Cornell High Energy Synchrotron Source, Cornell University Ithaca, NY 14853, U.S.A.
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Abstract

Investigation into the temperature dependence of the surface morphology of a thin film of p-sexiphenyl (p-6P) on KCl(001) was carried out by atomic force microscopy (AFM). An individual p-6P film was prepared by vapor deposition at a base pressure of ∼1x10-8 mbar onto a KCl(001) surface which was maintained at 323 K during deposition. The AFM was carried out in a separate vacuum chamber, in situ, at a base pressure of ∼1x10-6 mbar. The p-6P film was cooled and maintained at discrete temperatures in the range from 294 K to 128 K as AFM measurements were performed. Similar surface morphologies are observed for film temperatures maintained at 294, 264, and 227 K, and 188 and 128 K during the AFM measurements. AFM images for the first set of film temperatures (294 - 227 K) indicate the presence of block-like islands of p-6P, with well-defined crystallite boundaries. AFM images of the films in the second set (188 and 128 K) indicate the presence of triangular wedge-shaped structures of p-6P preferentially aligned nearly in the direction of the [110]KCl. Comparison of these wedge-shaped structures at the indicated film temperatures reveals they are rotated by approximately 180° with respect to each other. Subsequent images of the surface of the p-6P film captured again at 294 K, after the final 128 K temperature study was completed, revealed the same surface features found for the initial 294 K film temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 708: Symposium BB – Organic Optoelectronic Materials, Processing and Devices , 2001 , BB10.1
Copyright
Copyright © Materials Research Society 2002

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References

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