Dielectric relaxation in charge-carrier-dominated systems

Grzegorz W. Bak

doi:10.1117/12.276254

13 June 1997 Dielectric relaxation in charge-carrier-dominated systems

Grzegorz W. Bak

Proceedings Volume 3181, Dielectric and Related Phenomena: Materials Physico-Chemistry, Spectrometric Investigations, and Applications; (1997) https://doi.org/10.1117/12.276254
Event: Dielectric and Related Phenomena: Materials Physico-Chemistry, Spectrometric Investigations, and Applications, 1996, Szczyrk, Poland

Abstract

The dielectric response in some organic low-molecular weight compounds is defined by the injection of charge from electrodes. THe dielectric response of a few organic compounds shows a dielectric loss peak due to the relaxation of charge among traps. We can estimate the depth of traps provided that the concentration of traps is high enough. If the concentration of the injected charge is much greater than the concentration of the intrinsic charge than the depolarization consists not only on the change of the spatial distribution of charge but on the outflow of the excess charge as well. If we assume that the depolarization current is proportional to the concentration of the free charge carriers than the depolarization process may be described by the appropriate equations. The numerical solutions of the equations show that in the case of a single trapping level of the depth E_t the depolarization due to the outflow of excess charge is of Debye type. The relaxation time proves to be dependent on the concentration of traps. For the concentration smaller than 10²¹ m^-3 the relaxation time is described by equation, for the greater concentrations the relaxation time increases twice as long as for the smaller trap concentrations.

Citation Download Citation

Grzegorz W. Bak "Dielectric relaxation in charge-carrier-dominated systems", Proc. SPIE 3181, Dielectric and Related Phenomena: Materials Physico-Chemistry, Spectrometric Investigations, and Applications, (13 June 1997); https://doi.org/10.1117/12.276254

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