\[\text{E}_{0}=-\frac{\text{q}}{\epsilon_{\text{si}}} \text{N}_{\text{d}} \cdot \text{n}_{\text{n} 0}=-\frac{\text{q}}{\epsilon_{\text{si}}} \text{N}_{\text{A}} \cdot \text{n}_{\text{p} 0}\]
\[\text{E}_{0}=-\frac{\text{q}}{\epsilon_{\text{si}}} \text{N}_{\text{d}} \cdot \text{n}_{\text{n} 0}=-\frac{\text{q}}{\epsilon_{\text{si}}} \text{N}_{\text{A}} \cdot \text{n}_{\text{p} 0}\]