# Solar Energy Help ASAP

posted by Anonymous

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).

1. bobpursley

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 )

2. Anon

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

3. Anonymous

voc= kt/q * jph/jo + 1

4. patel k k

1402

5. MANIRAGUHA Eric

0.659 V

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