Abstract
Steady-state electrical measurements and optical-absorption experiments were performed on 50 nm thick samples of sublimed heavy-fraction rare-earth-element bisphthalocyanines films. From the Arrhenius plot of In Σ(T) (where Σ(T) is the conductivity at temperatureT it was found that two conduction regimes existed. The activation energy of 0.18 eV at high temperatures (T > 162 K) relates to the distance of singlet states below the conduction band. The low-temperature activation energy of 4 meV indicates hopping conduction between localized states close to the Fermi level. Visible optical spectra in both absorption and transmission modes were obtained for the sample. The absorption data were analysed in terms of a well-known power law, and a value of 2.3 eV was found for the optical gap,E 0. Estimates of the refractive indices and the dielectric constants were made over the visible spectrum.
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References
P. N. Moskalev andI. S. Kirin Opt. Spectrosc. 29 (1970) 220.
M. Petty D. R. Lovett andJ. M. O'Connor Thin Solid Films 179 (1989) 387.
Y. Liu K. Shigehara M. Hara andA. Yamada J. Amer. Chem. Soc. 113 (1991) 440.
B. Lukas D. R. Lovett andJ. Silver Thin Solid Films 210/211 (1992) 213.
J. Silver P. Lukes P. Hey andM. T. Ahmet J. Mater. Chem. 2 (1992) 841.
J. Silver, P. Lukes, A. Houlton, S. Howe, P. Hey and M. T. Ahmet,ibid. J. Mater. CheM. 2 (1992) 849.
Y. Liu K. Shigehara andA. Yamada Thin Solid Films 179 (1989) 220.
M. L. Roderiguez-Mendez R. Aroca andJ. A. DeSaja Chem. Mater. 4 (1992) 1017.
M. J. Stillman andT. Nyokong, in Phthalocyanines - properties and applications, edited by C. C. Lenznoff and A. P. B. Lever (VCH Publishers, New York, 1989) p. 133.
C. S. Frampton J. N. O'Connor J. Peterson andJ. Silver Displays Tech. Appl. 9 (1988) 174.
R. A. Collins A. Krier andA. K. Abass Thin Solid Films 229 (1993) 113.
J. Silver P. Lukes S. D. Howe andB. Howlin J. Mater. Chem. 1 (1991) 29.
J. Simon andJ. J. Andre, Molecular semiconductors (Springer Verlag, Berlin, 1984) p. 124.
N. F. Mott andE. A. Davis, Electronic processes in noncrystalline materials (Clarendon Press, Oxford, 1979) p. 291.
A. K. Ray S. Mukhopadhyay andM. J. Cook Phys. Status. Solidi (a),134 (1992) k73.
J. Tauc, in The optical properties of solids, edited by F. Abeles (North-Holland, Amsterdam, 1970) p. 277.
E. A. Davis andN. F. Mott Phil. Mag. 22 (1970) 903.
A. Gieren andW. Hoppe J. Chem. Soc. Chem. Comm. 8 (1971) 413.
T. S. Moss G. J. Burrell andB. Ellis, Semiconductor opto-electronics (Butterworth, London, 1973) p. 10.
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Exley, J., Ray, A.J., Ahmet, M.M. et al. Electrical and optical properties of sublimed films of heavy-fraction rare-earth-element bisphthalocyanines. J Mater Sci: Mater Electron 5, 180–184 (1994). https://doi.org/10.1007/BF01198951
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DOI: https://doi.org/10.1007/BF01198951