Alternating current investigation of copper phthalocyanine films in the presence of blocking contacts

Vidai, Yu. A.; Kocharli, K. Sh.; Barkhalov, B. Sh.; Sadreddinov, S. A.

doi:10.1002/pssa.2210340161

Cited by 21 publications

(2 citation statements)

References 4 publications

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“…30 We consider that this mechanism is likely to operate in CuPc thin films as well because the main Such ions can act as charged defects. Further, the dielectric constant is 3.6 for dispersed CuPc thin films having T 0 ϭ500 K and 3.2 for evaporated CuPc thin films 26 having T 0 ϭ590 K consistent with the above theoretical prediction. In addition, the localized-state distribution with the inflection point as shown in Fig.…”

Section: Resultssupporting

confidence: 83%

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Modulated photocurrent study of localized-state distributions in copper phthalocyanine thin films

Naito

1996

Journal of Applied Physics

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Surface chemistries and electronic properties of molecular semiconductor thin films grown by effusion beams AIP Conf.Localized-state distributions in copper phthalocyanines dispersed in polymer binders have been investigated with the modulated photocurrent ͑MPC͒ technique. The well-defined transport state of holes is observed in the excitation wavelength dependence of MPC. The frequency resolved MPC experiments reveal that the density of the localized states consists of the two exponential distributions having the characteristic temperatures of 500 and 1200 K with the inflection point at 0.53 eV above the transport state. These results are compared with those of evaporated copper phthalocyanine thin films, and no significant difference is found. The origin of the exponential distribution of the localized states is discussed in the light of statistical distribution of charged centers as sources of random potential.

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Section: Resultssupporting

confidence: 83%

“…The trapping level of 0.54 eV similar to that observed here, obtained by dielectric measurement, has been reported in Al/CuPc/Al sample structure. 26 The frequency scale in Fig. 4 is converted to the energy scale, shown as the upper scale in Fig.…”

Section: Resultsmentioning

confidence: 99%

Modulated photocurrent study of localized-state distributions in copper phthalocyanine thin films

Naito

1996

Journal of Applied Physics

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Fourier transform infrared spectroscopic and AC electrical conductivity studies of chitin and its derivatives

Seoudi¹,

Nada²,

El‐Mongy³

et al. 2005

J of Applied Polymer Sci

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ABSTRACT:The vibrational modes and the purity index of chitin and its derivatives as biopolymers are studied by Fourier transform infrared spectroscopy in the wavenumber range from 4000 to 400 cm Ϫ1 . The absorption bands of chitin and its derivatives are assigned. New bands appeared at 1419, 1209, 915, and 800 cm Ϫ1 for chitin derivatives due to the change of vibrational modes. The purity indexes are calculated from the ratio of the absorption band of C ϭ O at 1662 cm Ϫ1 and OH at 3443 cm Ϫ1 . Generally, the purity indexes of chitin derivatives are higher than that of chitin, which is due to the decrease of OH. The dielectric properties such as the real part of the dielectric constant (Ј) and loss tangent tan (␦) are measured as a function of temperature at different frequencies ranging from 200 to 2000 kHz. The increase of (Ј) and tan (␦) with increasing temperature is discussed on the basis of increasing polarizability and the decrease with increasing frequency can be attributed to the dielectric dispersion. AC electrical conductivities as a function of the reciprocal of the absolute temperature are also discussed. The mechanism of the charge carrier is discussed as a tunneling model in the temperature range from 300 to 360 K.

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Relaxation currents in conductive organic films

Barkhalov

Lutsenko

Vidadi

1980

Phys. Stat. Sol. (a)

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Polarization and dcpolarization currents observed at uniform heating and associated with the presence of electrode barriers of a complcx form are studied in organic films. The barrier height can vary materially under the effect of the applied field. This accounts for the difference between the relaxation currents obtained with and without the application of voltage, both in magnitude and in sign. The low-temperature peak of the relaxation current, like the peak of thermostirnulated conductivity. allows to determine the energies of traps in the compounds studied. The hightemperature peak is associated with the electrode barrier.

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Alternating current investigation of copper phthalocyanine films in the presence of blocking contacts

Cited by 21 publications

References 4 publications

Modulated photocurrent study of localized-state distributions in copper phthalocyanine thin films

Modulated photocurrent study of localized-state distributions in copper phthalocyanine thin films

Fourier transform infrared spectroscopic and AC electrical conductivity studies of chitin and its derivatives

Relaxation currents in conductive organic films

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