The formula for the contact potential of a pn-junction diode is given by the formula: Aøo kT = - In NaNa e This contact potential ensures that the net current across the junction is zero. Which side is higher in electron potential energy – the n or the p-side? Briefly explain your answer. b) Even though there is no net current across the pn-junction in equilibrium with no applied voltage (V=0), there are two individual currents associated with electrons that add to zero (and two more associated with holes) – drift and diffusion current. Explain what they are (and how they arise), and give their direction (for electrons). c) Which of the two types of current is independent of A¢o? Briefly explain why.

The formula for the contact potential of a pn-junction diode is given by the formula: Aøo kT = - In NaNa e This contact potential ensures that the net current across the junction is zero. Which side is higher in electron potential energy – the n or the p-side? Briefly explain your answer. b) Even though there is no net current across the pn-junction in equilibrium with no applied voltage (V=0), there are two individual currents associated with electrons that add to zero (and two more associated with holes) – drift and diffusion current. Explain what they are (and how they arise), and give their direction (for electrons). c) Which of the two types of current is independent of A¢o? Briefly explain why.