A new precise method of electric modeling of thin film

In this paper, a new numerical method was developed for a precise electric modeling, of some physical samples. The proposed technique is based on the decomposition of the electric impedance of these samples into a series of elementary electric circuits. A numerical procedure using the Levenberg Marquadt algorithm was developed in order to estimate the order and number of these elementary circuits. A polymer diode, based on polyaniline, and a BST ceramic were chosen to test this method. An electric characterization, at low and high frequencies, was carried using a developed electronic system. The developed electric models are compared those often used in the literature. Interesting results are obtained at the level of the statistical errors and the signification of the different elements of the models.In this paper, a new numerical method was developed for a precise electric modeling, of some physical samples. The proposed technique is based on the decomposition of the electric impedance of these samples into a series of elementary electric circuits. A numerical procedure using the Levenberg Marquadt algorithm was developed in order to estimate the order and number of these elementary circuits. A polymer diode, based on polyaniline, and a BST ceramic were chosen to test this method. An electric characterization, at low and high frequencies, was carried using a developed electronic system. The developed electric models are compared those often used in the literature. Interesting results are obtained at the level of the statistical errors and the signification of the different elements of the models

Development of Numerical Method for Optimizing Silicon Solar Cell Efficiency

This paper presents a development of numerical method to determine and optimize the photocurrent densities in silicon solar cell. This method is based on finite difference algorithm to resolve the continuity and Poisson equations of minority charge carriers in p-n junction regions by using Thoma’s algorithm to resolve the tridiagonal matrix. These equations include several physical parameters as the absorption coefficient and the reflection one of the material under the sunlight irradiation of AM1.5 solar spectrum. In this work, we study the effect of various parameters such as thickness and doping concentration of the (emitter, base) layers on crystalline silicon solar cell perfomance. The obtained results show that the optimum energy conversion efficiency is 22.16 % with the following electrical parameters solar cell Voc = 0.62 V and Jph = 43.20 mA · cm – 2. These results are compared with experimental data and show a good agreement of our developped method