The current density of an ideal p-n junction under illumination can be described by:
J(V)=Jph−J0(eqVkT−1)
where Jph is the photo-current density, J0 the saturation-current density, q the elementary charge, V the voltage, k the Boltzmann's constant, and T the temperature.
A crystalline silicon solar cell generates a photo-current density of Jph=40mA/cm2 at T=300K. The saturation-current density is J0=1.95∗10−10mA/cm2.
Assuming that the solar cell behaves as an ideal p-n junction, calculate the open-circuit voltage Voc (in V).
0.659 V
0.674 can someone help with the others quetion? Q4 5 6 7?
If it is open circuit, then J(v)=0
or
Jph=Jo(e^(qV/T) )
Take the ln of each side
ln (Jph/Jo)=qV/T
Voc=T/q *ln(Jph/Jo )