Chapter 2, Problem 2.12EP

(a) Photons with an energy of $hv=2\text{eV}$ are incident on the photodiode shown in Figure 244. The junction area is $A=0.5{\text{cm}}^{\text{2}}$ , the quantum efficiency is $\eta =0.8$ , and the light intensity is $6.4\times {10}^{-2}{\text{W/cm}}^{\text{2}}$ . Determine the photocurrent $I_{ph}$ . (b) If $R=1\text{k}\Omega$ , determine the minimum power supply voltage $V_{PS}$ needed to ensure that the diode is reverse biased. (Ans. (a) $I_{ph}=12.8\text{mA}$ , (b) $I_{PS}\left(\min \right)=12.8\text{V}$ )