Figure 9.4: Effect of the (a) series resistance; and (b) parallel resistance on the J-V characteristic of a solar cell.
In real solar cells the FF is influenced by additional recombination occurring in the pn junction. This non-ideal diode is often represented in the equivalent circuit by two
diodes, an ideal one with an ideality factor equal to unity and a non-ideal diode with an
ideality factor greater than one. The equivalent circuit of a real solar cell is presented in
Figure 9.5. The J-V characteristic of the two-diode equivalent circuit is given by
where J 01 and J 02 are the saturation current densities of the two diodes, respectively. n 1 and
n 2 are the ideality factors of the two diodes.
In real solar cells the FF is influenced by additional recombination occurring in the pn junction. This non-ideal diode is often represented in the equivalent circuit by two
diodes, an ideal one with an ideality factor equal to unity and a non-ideal diode with an
ideality factor greater than one. The equivalent circuit of a real solar cell is presented in
Figure 9.5. The J-V characteristic of the two-diode equivalent circuit is given by
where J 01 and J 02 are the saturation current densities of the two diodes, respectively. n 1 and
n 2 are the ideality factors of the two diodes.