Question

$\text{The diffusion capacitance}\left(C_D\right)\text{of a p-n junction diode.}$

Answer 1

$\text{We know that,}\text{Diffusion capacitance,}{C}_D=\frac{\tau I_f}{\eta V_T}\text{But, forward current},I_f=I_0{e}^{\frac{V_E}{\eta V_T}}\therefore C_D=\frac{\tau }{\eta V_T}{I}_0.e^{\frac{V_E}{\eta V_T}}\text{Hence}{C}_D\alpha e^{\frac{V_E}{\eta V_T}}$