Impact of Both Series and Shunt Resistance

In the presence of both series and shunt resistances, the IV curve of the solar cell is given by;

and the circuit diagram of the solar cell is given as;

Parasitic series and shunt resistances in a solar cell circuit.

To combine the effect of both series and shunt resistances, the expression for FFsh, derived above, can be used, with FF0 replaced by FFs [1]. The overall equation then becomes;

where FFs is given by;

and by combining the above equations, the net equation for FF becomes;

 
Rs
 
Rshunt
ideal
real

The following calculator determines the effect of Rs and Rsh on the cell fill factor using the same variable definitions as above.

Effect of Both Resistances Calculator