Excess minority carrier's diffusion equation in the base of monofaciale silicon solar cell under frequency modulation of monochromatic illumination is resolved. Using conditions at the base limits involving recombination velocities Sf and Sb, respectively at the junction (n + /p) and back surface (p + /p), the AC expression of the excess minority carriers' density δ (T, ω) is determined. The AC density of photocurrent J ph (T, ω) is represented versus recombination velocity at the junction for different values of the temperature. The expression of the AC back surface recombination velocity Sb of minority carriers is deduced depending on the frequency of modulation, temperature, the electronic parameters (D (ω)) and the thickness of the base. Bode and Nyquist diagrams are used to analyze it.

Linfluence de lirradiation de particules chargees (helium, electrons, protons, ions lourds, etc.) sur une photopile au silicium n+-p-p+ sous eclairement dune lumiere monochromatique est consideree dans la determination de lepaisseur optimum de la base. Des expressions de la vitesse de recombinaison a la face arriere (Sb1 intrinseque et Sb2 dependante de labsorption de la lumiere) sont comparees graphiquement, donnant les epaisseurs optimales necessaires pour lelaboration de photopilesau silicium devant fonctionner dans des cas de flux denergie dirradiation.

The aim of this study is to show the influence of temperature on the relative value of the short-circuit photocurrent density obtained from an n+-p-p+silicon solar cell front illuminated with modulated polychromatic light. The solar cell was already subjected to charged particules irradiation flux (Φp) and intensity (kl,) and remained under both magnetic field (B) and temperature (T). Thus, the graphical representation of the relative value of the short-circuit photocurrent density as a function of the square of the magnetic field (B) yields to determine the slope, which is related to the mobility of minority carriers in the base. It is obtained for a back surface field silicon solar cellunder both temperature and irradiation flux of charged particules.

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