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In order to obtain a solution to the short circuit current in a solar cell a boundary condition

n=p=0 at the junction

is imposed. Why only for short circuit current?

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  • $\begingroup$ What are $n$ and $p$? $\endgroup$ – Farcher Sep 12 at 9:15
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    $\begingroup$ What condition is the diode in while under 'short circuit' conditions? What impact does that have on carrier concentrations in different regions of the cell? $\endgroup$ – Jon Custer Sep 12 at 13:19
  • $\begingroup$ $n(x)$ and $p(x)$ are the electron and hole concentrations at position $x$. Under short circuit the $n(x)$ and $p(x)$ ends are connected by a wire that is short circuited. $\endgroup$ – SAKhan Sep 12 at 17:32
  • $\begingroup$ To be more precise $n$ and $p$ are the excess concentrations over the equilibrium (no light) value. $\endgroup$ – SAKhan Sep 12 at 20:55
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Simply because in the short circuit case no voltage other than built-in voltage exsist at the junction.

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