Abstract
The effects of oxidizing gases (O2 and NO2) on the p-type semiconductivity of the phthalocyanines H2Pc, PbPc, ZnPc, CuPc, AlPcCl, AlPc-O-AlPc and (AlPc) n films treated in nitrogen at 350 ° C have been examined. The conductance increased in the presence of oxidizing gases. Reversible effects of oxidizing gases on the conductance were observed for PbPc, CuPc and ZnPc, all of which are thermally and/or chemically less stable than the other Pcs. For the latter, the conductance in nitrogen increased permanently after exposure to NO2. The reversibility of the former may be related to the thermal and chemical stability of neutral and/or oxidized phthalocyanines. The conductivity is described byG =G 0 exp (E/kT) The activation energy,E, decreased in the presence of oxidizing gases. The pre-exponential factor,G 0, was lowered by the introduction of NO2 especially for PbPc, CuPc and ZnPc. It seems that the adsorption of NO2 is limited to the surface of fine crystals and the increase in the conductance caused by exposure to NO2 is strongly influenced by the crystallinity of phthalocyanine.
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