Long-term relaxation of the current in a naturally disordered [Pb.sub.3][O.sub.4] semiconductor

Charge transfer has been studied in metal--dielectric--metal structures based on polycrystalline layers of lead orthoplumbate [Pb.sub.3][O.sub.4] with a binder--cyanoethyl ester of polyvinyl alcohol, deposited on a glass substrate with a conducting ITO film. Time dependences of the current have been investigated in the temperature range T = 300-370 K and in the range of dc electric field strengths E = 2 x [10.sup.5]-9 x [10.sup.5] V/m. Flowing of the relaxation polarization current leads to charge accumulation in the near-electrode region. Experimental dependences agree with the relay race mechanism of charge transfer with the participation of deep local levels. Microparameters of charge transfer are determined upon varying the experimental conditions.