Electron concentration in n-type region (in 1018cm−3 ):
To determine the electron concentration in an n-type region, you need to know the doping concentration of donor atoms in the material. The donor atoms in an n-type region provide additional free electrons, thereby increasing the electron concentration.
Let's assume you know the donor atom concentration, denoted as Nd, in units of cm^(-3). The electron concentration, denoted as n, can be calculated using the equation:
n = Nd
Note: In an extrinsically doped semiconductor, the electron concentration is approximately equal to the donor atom concentration when the temperature is not too high.
So, if you have the donor atom concentration (Nd) in units of cm^(-3), you can directly obtain the electron concentration (n) by using the same value.
For example, if the donor atom concentration (Nd) is given as 1x10^18 cm^(-3), then the electron concentration (n) in the n-type region would also be 1x10^18 cm^(-3).