Question

In a uniformly doped abrupt p-n junction the doping level of the n-side is four (4) times the doping level the p-side the ratio of the depletion layer width of n-side verses p-side is

• A. $1.0$
• B. $2.0$
• C. $0.5$
• D. $0.25$

Answer 1

The correct option is D $0.25$

Ans : (a)

In the step graded diode, by using charge density condition or charge neutrality condition
$\frac{W_N}{W_P}=\frac{N_A}{N_D}$
$\frac{W_N}{W_P}=\frac{N_A}{4N_A}=\frac{1}{4}=0.25$