The Effect of Ammonia Adsorption on Conductivity
of Thin Copper Tetrabromophthalocyanine Films

G. L. Pakhomov*, L. G. Pakhomov*, M. K. Anglada**, and J. M. Ribo**

* Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 117334 Russia
** Faculty of Chemistry, Barcelona University, av. Marti and Franckes 1, Barcelona, 08028 Spain

Received November 29, 1995

Abstract—The dependences of the conductivity of thin sublimated phthalocyanine (4-Br₄PcCu) films on the
temperature and ammonia pressure are studied. The corresponding 3D plot has maxima and minima and makes
it possible to evaluate the enthalpy of ammonia adsorption, 21 kJ/mol. An explanation of the dependences
obtained is given.

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