It is then said that the current through
Rsp (series resistance) is
ip is the current proportional to the incident luminous flux and
id the dark current (constant at a given temperature).
My question is: In the model it is always shown a diode
Dp, that accounts for the rectifying effect of the junction. But it can't be an ideal diode, otherwise
ip+idwould flow through it and not through
Rps. What is the role of this diode in the model and how does it affect the current through