Final answer:
The depletion layer width for a reverse voltage of 5V can be calculated using the given formula, resulting in the diode's depletion width expanding to approximately 3.595μm. Applying a forward voltage of -10V is not physically realistic, as it exceeds the diode's typical operating conditions and would likely result in damage.
Step-by-step explanation:
To calculate the depletion layer width for a diode with given parameters for the reverse voltage (VR) and forward voltage (VD), we can use the formula for the depletion layer width which is based on the built-in potential, the applied voltage, and the doping concentrations. However, since the doping concentrations are not given in the problem, we will assume that the depletion layer width changes linearly with the applied voltage. The depletion layer width (W) can be estimated using the formula:
W = WDO √(1 + V/VJ)
where WDO is the depletion width at zero applied voltage, V is the applied voltage, and VJ is the built-in potential of the diode.
For the reverse voltage (VR=5V):
WR = 1.5μm √(1 + 5V/0.8V) = 1.5μm √(1 + 6.25) = 1.5μm √7.25
For the forward voltage (VD=-10V, which is typically not applied as diodes are not designed to handle such a large forward bias and might get damaged, but theoretically):
WD = 1.5μm √(1 - 10V/0.8V) = 1.5μm √(1 - 12.5)
This calculation for WD will not yield a real number as the square root of a negative number is not defined in the real number system. Therefore, we must disregard VD=-10V as a physical impossibility for a normal diode operation.