Posted by **Anonymous** on Thursday, October 17, 2013 at 3:50pm.

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).

- Solar Energy Help ASAP -
**bobpursley**, Thursday, October 17, 2013 at 4:21pm
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 )

- Solar Energy Help ASAP -
**Anon**, Friday, October 18, 2013 at 4:49pm
0.674 can someone help with the others quetion? Q4 5 6 7?

- Solar Energy Help ASAP -
**Anonymous**, Sunday, October 5, 2014 at 4:31pm
voc= kt/q * jph/jo + 1

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