Dear All
I have IM data and I want to calculate electron life time under dark and light:
1) Its possible that I select the max z''(ohm) and in this mount what's the frequency (as a Fmax), then I put it in the Eqe: life time (t)=1/2pfmax.
2) What is different between electron life time under dark and light for one sample?
its possible the life time of electron under dark be bigger than the life time of electron (under light) ?
Dear Sima Vaziri,
You asked a very good question! The measurements of Impedance under light and dark are different due to photoelectric effect under light, which leads to photoelectric current. In another words, the impedance of your sample under light should be lower than that in the dark.
Dear Sima Vaziri
,welcome!
Conceptually the complex impedance of the solar cell depends on the DC operating point of the solar cell.
So, you have to show us the impedance curves and state the DC operating point in each case.
On the other side the minority carrier lifetime depends of the injection level in the solar cell.
I used the dark current to measure the lifetime of the solar cell under different biasing conditions and you can follow it in the link: Article A distributed SPICE-model of a solar cell
I found that by increasing the forward current in the cell the lifetime increases. So, it may be that the the illuminated case pass only smaller forward current in the diode of the solar cell.
But when you show your specific results, one can give more specific answer.
please give me your feed back.
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