Abstract
In this work, a theory based on the steady photoconductivity method, of a bifacial silicon solar cell under polychromatic illumination and a magnetic field effect, is presented. The resolution of the continuity equation in the base of the solar cell, allowed us to establish the expression of the minority carriers’ density from which the photoconductivity, the photocurrent density, the photovoltage and the solar output power as function of the junction recombination velocity and the applied magnetic field, were deduced. From I-V and P-V characteristics of the solar cell, optimal photovoltage and optimal photocurrent obtained at the maximum power point corresponding to a given operating point which is correlated to an optimal junction recombination velocity, were determined according to the magnetic field. By means of the relation between the photocurrent density and the photoconductivity, the junction electric field has been determined at a given optimal junction recombination velocity.
Highlights
The photoconductivity is due to the absorption of incident photons that create free charge carriers in the conduction band and/or in the valence band of a conducting material
In first, the photoconductivity profile, the I-V and P-V characteristics and in the second time, the determination method of the optimal operating point and junction electric field
Profile of the Photoconductivity According to the Junction Recombination Velocity In Figure 2, the photoconductivity versus the junction recombination velocity, is represented for different values of the magnetic field: In Figure 2, we obtain the same behavior for the four curves of the photoconductivity versus junction recombination velocity
Summary
The photoconductivity is due to the absorption of incident photons that create free charge carriers in the conduction band and/or in the valence band of a conducting material. Many studies on the photoconductivity, have been utilized for determining a few intrinsic parameters of semiconductors in different regimes, as: in transient one [4] [5], where a relationship between the photoconductivity, the average lifetime and the generation rate of the photogenerated minority carriers has led to determine the density of states as function of the temperature; in steady-state [6]-[12], without an applied magnetic field, the effective lifetime of the minority carriers is determined and the photoconductivity according to the temperature, the generation rate and the incident light intensity, what permits to determine the recombination density of states. Many researches have been carried out on the determination of the junction electric field by considering any more a magnetic field effect at a corresponding functioning point of a solar cell. That permits us to study, in this work, the photoconductivity of a bifacial silicon solar cell according to the magnetic field and the junction recombination velocity in order to determine the optimal operating point and the corresponding junction electric field
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