Studying defects in thin organic films
Abstract
The author studies behaviour of pentacene film surface exposed to atomic hydrogen by means of scanning tunneling microscopy. Due consideration is given to adsorption of atomic hydrogen on the pentacene surface and generation of point defects. Scanning tunneling microscopy allows researching into electronic structure of defects and showing their generation to be caused by chemical reactions between atomic hydrogen and surface. There are some charge traps in point defects. Special emphasis is focused on analyzing adsorption process and construction of qualitative model. The curve of adsorption is comprised of two linear areas with a fracture in point 25 Langmuir that is indicative of two various absorption mechanisms. The author makes qualitative model of surface open-up via pentacene molecule breakdown and proposes a method of fighting with this effect suitable for semiconductor surface restoration.
Keywords
УДК 544.022.341:544.72.023.221:543.456.42/456
References
1. Bolto B.A., McNeill R. Weiss D.E. Electronic Conduction in Polymers. III. Electronic Properties of Polypyrrole // Austr. J. Chem. 1963. Vol. 16, No. 6. P. 1090-1103.
2. Dimitrakopoulos C.D., Mascaro D.J. Organic thin-film transistors: A review of recent advances // IBM J.Res. & Dev. 2001. Vol. 45, No. 1.
3. Jurchescu O.D. The effect of impurities on the mobility of single crystalpentacene //App. Phys. let. 2004. Vol. 84. P. 16.
4. Nazin G. V., Qiu X.H., Ho W. Charging and Interaction of Individual Impurities in a Monolayer Organic Crystal// Phys. Rev. Eett. 2005. Vol. 95. P. 166103.
5. Nelson S.F., Lin Y.-Y., Gundlach D.J., Jackson T.N. Temperature-Independent Transport in High-Mobility Pentacene Transistors//Appl. Phys. Eett. 1998. Vol. 72. P. 1854.
6. Northrup J.E., Chabinyc M.L. Gap states in organic semiconductors: Hydrogen- and oxygen-induced states in pentacene // Phys. Rev. B. 2003. Vol. 68. P. 041202(R).
Review
For citations:
Tupkalo A.V. Studying defects in thin organic films. Pacific Medical Journal. 2009;(3):61-63. (In Russ.)
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