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

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1 Author(s)
Naito, Hiroyoshi ; Department of Physics and Electronics, Osaka Prefecture University, Gakuen‐cho, Sakai, Osaka 593, Japan

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Localized‐state distributions in copper phthalocyanines dispersed in polymer binders have been investigated with the modulated photocurrent (MPC) 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. © 1996 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:80 ,  Issue: 9 )