Task-7 Calculate the midgap voltage

The midgap voltage can be found by figuring out the midgap capacitance first. By definition, the midgap capacitance is a series capacitance with the oxide capacitance (which is the maximum capacitance) and the depletion capacitance, namely,

where

From the lecture note, we obtain an important information, which is that the under midgap condition,

therefore:

The interpretations of the required variables are listed below:

Permittivity in free space - 8.85e(-12) F/M
Relative permittivity for silicon – 11.7
Charge carried by an electron – 1.602*10^(-19) C
Maximum capacitance (read from the given txt file) -2.92*10^3 pF

After calculation

From the txt file, we can figure out the midgap voltage is between 1.36 and 1.37 volts.