Solar Energy Help ASAP
posted by Anonymous .
The current density of an ideal pn junction under illumination can be described by:
J(V)=Jph−J0(eqVkT−1)
where Jph is the photocurrent density, J0 the saturationcurrent density, q the elementary charge, V the voltage, k the Boltzmann's constant, and T the temperature.
A crystalline silicon solar cell generates a photocurrent density of Jph=40mA/cm2 at T=300K. The saturationcurrent density is J0=1.95∗10−10mA/cm2.
Assuming that the solar cell behaves as an ideal pn junction, calculate the opencircuit voltage Voc (in V).

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 ) 
0.674 can someone help with the others quetion? Q4 5 6 7?

voc= kt/q * jph/jo + 1

1402

0.659 V