Comparison of some models for nonlinear fitting analysis of TSC measurements

Basic differential equations for thermally stimulated conductivity (TSC) measurement have no analytical solutions even for the simplest cases. Therefore, analysis of the obtained results is very difficult. The same equations are used also for thermoluminescence (TL). Nevertheless, TL analysis is much easier due to a number of approximate models, such as general order kinetics and mixed order kinetics. In this paper we discuss usefulness of the approximations in description of TSC with respect to determination of trap parameters using nonlinear curve fitting analysis. For this purpose appropriate equations were derived. The results are compared to the recently derived method based on the quasi equilibrium approximation.