\(I\left[V\right]=\) \(I_{\text{PH}}\left[\Phi\right]\) (1)
\(-\ I_{0}\times\left(\text{Exp}\left[\frac{q\left(V+I\left[V\right]\times R_{S}\right)}{n\ \times kT}\right]-1\right)\)
\(-\ \frac{V+I\left[V\right]\times R_{S}}{R_{\text{Sh}}}\)