Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
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?
Simply because in the short circuit case no voltage other than built-in voltage exsist at the junction.
Required, but never shown